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#!/bin/sh
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#
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# FFmpeg configure script
#
# Copyright (c) 2000, 2001, 2002 Fabrice Bellard
# Copyright (c) 2005-2006 Diego Biurrun
# Copyright (c) 2005-2006 Mans Rullgard
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#
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# make sure we are running under a compatible shell
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# try to make this part work with most shells

try_exec(){
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    echo "Trying shell $1"
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    type "$1" >/dev/null 2>&1 && exec "$@"
}

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unset foo
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(: ${foo%%bar}) 2>/dev/null
E1="$?"

(: ${foo?}) 2>/dev/null
E2="$?"

if test "$E1" != 0 || test "$E2" = 0; then
    echo "Broken shell detected.  Trying alternatives."
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    export FF_CONF_EXEC
    if test "0$FF_CONF_EXEC" -lt 1; then
        FF_CONF_EXEC=1
        try_exec bash "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 2; then
        FF_CONF_EXEC=2
        try_exec ksh "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 3; then
        FF_CONF_EXEC=3
        try_exec /usr/xpg4/bin/sh "$0" "$@"
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    fi
    echo "No compatible shell script interpreter found."
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    echo "This configure script requires a POSIX-compatible shell"
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    echo "such as bash or ksh."
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    echo "THIS IS NOT A BUG IN FFMPEG, DO NOT REPORT IT AS SUCH."
    echo "Instead, install a working POSIX-compatible shell."
    echo "Disabling this configure test will create a broken FFmpeg."
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    if test "$BASH_VERSION" = '2.04.0(1)-release'; then
        echo "This bash version ($BASH_VERSION) is broken on your platform."
        echo "Upgrade to a later version if available."
    fi
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    exit 1
fi

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show_help(){
  echo "Usage: configure [options]"
  echo "Options: [defaults in brackets after descriptions]"
  echo
  echo "Standard options:"
  echo "  --help                   print this message"
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  echo "  --log[=FILE|yes|no]      log tests and output to FILE [config.err]"
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  echo "  --prefix=PREFIX          install in PREFIX [$PREFIX]"
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  echo "  --libdir=DIR             install libs in DIR [PREFIX/lib]"
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  echo "  --shlibdir=DIR           install shared libs in DIR [PREFIX/lib]"
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  echo "  --incdir=DIR             install includes in DIR [PREFIX/include/ffmpeg]"
  echo "  --mandir=DIR             install man page in DIR [PREFIX/man]"
  echo "  --enable-mingwce         enable MinGW native/cross WinCE compile"
  echo "  --enable-static          build static libraries [default=yes]"
  echo "  --disable-static         do not build static libraries [default=no]"
  echo "  --enable-shared          build shared libraries [default=no]"
  echo "  --disable-shared         do not build shared libraries [default=yes]"
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  echo "  --enable-gpl             allow use of GPL code, the resulting libav*"
  echo "                           and ffmpeg will be under GPL [default=no]"
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  echo "  --enable-pp              enable GPLed postprocessing support [default=no]"
  echo "  --enable-swscaler        software scaler support [default=no]"
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  echo "  --enable-beosthreads     use BeOS threads [default=no]"
  echo "  --enable-os2threads      use OS/2 threads [default=no]"
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  echo "  --enable-pthreads        use pthreads [default=no]"
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  echo "  --enable-w32threads      use Win32 threads [default=no]"
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  echo "  --enable-x11grab         enable X11 grabbing [default=no]"
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  echo
  echo "External library support:"
  echo "  --enable-sunmlib         use Sun medialib [default=no]"
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  echo "  --enable-dc1394          enable IIDC-1394 grabbing using libdc1394"
  echo "                           and libraw1394 [default=no]"
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  echo "  --enable-liba52          enable GPLed liba52 support [default=no]"
  echo "  --enable-liba52bin       open liba52.so.0 at runtime [default=no]"
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  echo "  --enable-avisynth        allow reading AVISynth script files [default=no]"
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  echo "  --enable-libdts          enable GPLed libdts support [default=no]"
  echo "  --enable-libfaac         enable FAAC support via libfaac [default=no]"
  echo "  --enable-libfaad         enable FAAD support via libfaad [default=no]"
  echo "  --enable-libfaadbin      build FAAD support with runtime linking [default=no]"
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  echo "  --enable-libgsm          enable GSM support via libgsm [default=no]"
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  echo "  --enable-libmp3lame      enable MP3 encoding via libmp3lame [default=no]"
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  echo "  --enable-libnut          enable NUT (de)muxing via libnut,"
  echo "                           native demuxer exists [default=no]"
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  echo "  --enable-libogg          enable Ogg muxing via libogg [default=no]"
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  echo "  --enable-libtheora       enable Theora encoding via libtheora [default=no]"
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  echo "  --enable-libvorbis       enable Vorbis en/decoding via libvorbis,"
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  echo "                           native implementations exist [default=no]"
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  echo "  --enable-x264            enable H.264 encoding via x264 [default=no]"
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  echo "  --enable-xvid            enable Xvid encoding via xvidcore,"
  echo "                           native MPEG-4/Xvid encoder exists [default=no]"
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  echo "  --enable-amr_nb          enable amr_nb float audio codec"
  echo "  --enable-amr_nb-fixed    use fixed point for amr-nb codec"
  echo "  --enable-amr_wb          enable amr_wb float audio codec"
  echo "  --enable-amr_if2         enable amr_wb IF2 audio codec"
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  echo ""
  echo "Advanced options (experts only):"
  echo "  --source-path=PATH       path to source code [$source_path]"
  echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]"
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  echo "  --cross-compile          assume a cross-compiler is used"
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  echo "  --target-os=OS           compiler targets OS [$targetos]"
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  echo "  --cc=CC                  use C compiler CC [$cc]"
  echo "  --make=MAKE              use specified make [$make]"
  echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]"
  echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]"
  echo "  --extra-libs=ELIBS       add ELIBS [$ELIBS]"
  echo "  --build-suffix=SUFFIX    suffix for application specific build []"
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  echo "  --arch=ARCH              select architecture  [$arch]"
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  echo "  --cpu=CPU                selects the minimum cpu required (affects"
  echo "                           instruction selection, may crash on older CPUs)"
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  echo "  --enable-powerpc-perf    enable performance report on PPC"
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  echo "                           (requires enabling PMC)"
  echo "  --disable-mmx            disable MMX usage"
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  echo "  --disable-armv5te        disable armv5te usage"
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  echo "  --disable-armv6          disable armv6 usage"
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  echo "  --disable-iwmmxt         disable iwmmxt usage"
  echo "  --disable-altivec        disable AltiVec usage"
  echo "  --disable-audio-oss      disable OSS audio support [default=no]"
  echo "  --disable-audio-beos     disable BeOS audio support [default=no]"
  echo "  --disable-v4l            disable video4linux grabbing [default=no]"
  echo "  --disable-v4l2           disable video4linux2 grabbing [default=no]"
  echo "  --disable-bktr           disable bktr video grabbing [default=no]"
  echo "  --disable-dv1394         disable DV1394 grabbing [default=no]"
  echo "  --disable-network        disable network support [default=no]"
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  echo "  --disable-ipv6           disable ipv6 support [default=no]"
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  echo "  --disable-zlib           disable zlib [default=no]"
  echo "  --disable-vhook          disable video hooking support"
  echo "  --disable-debug          disable debugging symbols"
  echo "  --disable-mpegaudio-hp   faster (but less accurate)"
  echo "                           MPEG audio decoding [default=no]"
  echo "  --disable-protocols      disable I/O protocols support [default=no]"
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  echo "  --disable-ffmpeg         disable ffmpeg build"
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  echo "  --disable-ffserver       disable ffserver build"
  echo "  --disable-ffplay         disable ffplay build"
  echo "  --enable-small           optimize for size instead of speed"
  echo "  --enable-memalign-hack   emulate memalign, interferes with memory debuggers"
  echo "  --disable-encoder=NAME   disables encoder NAME"
  echo "  --enable-encoder=NAME    enables encoder NAME"
  echo "  --disable-decoder=NAME   disables decoder NAME"
  echo "  --enable-decoder=NAME    enables decoder NAME"
  echo "  --disable-encoders       disables all encoders"
  echo "  --disable-decoders       disables all decoders"
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  echo "  --disable-muxer=NAME     disables muxer NAME"
  echo "  --enable-muxer=NAME      enables muxer NAME"
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  echo "  --disable-muxers         disables all muxers"
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  echo "  --disable-demuxer=NAME   disables demuxer NAME"
  echo "  --enable-demuxer=NAME    enables demuxer NAME"
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  echo "  --disable-demuxers       disables all demuxers"
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  echo "  --enable-parser=NAME     enables parser NAME"
  echo "  --disable-parser=NAME    disables parser NAME"
  echo "  --disable-parsers        disables all parsers"
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  echo
  echo "Developer options (useful when working on FFmpeg itself):"
  echo "  --enable-gprof           enable profiling with gprof [$gprof]"
  echo "  --disable-opts           disable compiler optimizations"
  echo "  --enable-extra-warnings  enable more compiler warnings"
  echo "  --disable-strip          disable stripping of executables and shared libraries"
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  echo ""
  echo "NOTE: Object files are built at the place where configure is launched."
  exit 1
}
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log(){
    echo "$@" >>$logfile
}

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log_file(){
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    log BEGIN $1
    cat -n $1 >>$logfile
    log END $1
}

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echolog(){
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    log "$@"
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    echo "$@"
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}

die(){
    echolog "$@"
    cat <<EOF
If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-devel@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
EOF
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    if enabled logging; then
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        cat <<EOF
Include the log file "$logfile" produced by configure as this will help
solving the problem.
EOF
    else
cat <<EOF
Rerun configure with logging enabled (do not use --log=no), and include the
log this produces with your report.
EOF
    fi
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    rm -f $TMPC $TMPO $TMPE $TMPS $TMPH
    exit 1
}

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# "tr '[a-z]' '[A-Z]'" is a workaround for Solaris tr not grokking "tr a-z A-Z"
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toupper(){
    echo "$@" | tr '[a-z]' '[A-Z]'
}

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tolower(){
    echo "$@" | tr '[A-Z]' '[a-z]'
}

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set_all(){
    value=$1
    shift
    for var in $*; do
        eval $var=$value
    done
}

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pushvar(){
    for var in $*; do
        eval level=\${${var}_level:=0}
        eval ${var}_${level}="\$$var"
        eval ${var}_level=$(($level+1))
    done
}

popvar(){
    for var in $*; do
        eval level=\${${var}_level:-0}
        test $level = 0 && continue
        eval level=$(($level-1))
        eval $var="\${${var}_${level}}"
        eval ${var}_level=$level
        eval unset ${var}_${level}
    done
}

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enable(){
    set_all yes $*
}

disable(){
    set_all no $*
}

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enabled(){
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    eval test "x\$$1" = "xyes"
}

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disabled(){
    eval test "x\$$1" = "xno"
}

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enabled_all(){
    for opt; do
        enabled $opt || return 1
    done
}

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disabled_all(){
    for opt; do
        disabled $opt || return 1
    done
}

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enabled_any(){
    for opt; do
        enabled $opt && return 0
    done
}

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disabled_any(){
    for opt; do
        disabled $opt && return 0
    done
}

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check_deps(){
    for cfg; do
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        enabled ${cfg}_checking && die "Circular dependency for $cfg."
        disabled ${cfg}_checking && continue
        enable ${cfg}_checking

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        eval dep_all="\$${cfg}_deps"
        eval dep_any="\$${cfg}_deps_any"
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        pushvar cfg dep_all dep_any
        check_deps $dep_all $dep_any
        popvar cfg dep_all dep_any

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        enabled_all $dep_all || disable $cfg
        enabled_any $dep_any || disable $cfg
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        disable ${cfg}_checking
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    done
}

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print_config(){
    pfx=$1
    header=$2
    makefile=$3
    shift 3
    for cfg; do
        if enabled $cfg; then
            ucname="${pfx}`toupper $cfg`"
            echo "#define ${ucname} 1" >> $header
            echo "${ucname}=yes" >> $makefile
        fi
    done
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}

flags_saved(){
    (: ${SAVE_CFLAGS?}) 2>/dev/null
}

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save_flags(){
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    flags_saved && return
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    SAVE_CFLAGS="$CFLAGS"
    SAVE_LDFLAGS="$LDFLAGS"
    SAVE_extralibs="$extralibs"
}

restore_flags(){
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    flags_saved || return
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    CFLAGS="$SAVE_CFLAGS"
    LDFLAGS="$SAVE_LDFLAGS"
    extralibs="$SAVE_extralibs"
    unset SAVE_CFLAGS
    unset SAVE_LDFLAGS
    unset SAVE_extralibs
}

temp_cflags(){
    save_flags
    CFLAGS="$CFLAGS $*"
}

temp_ldflags(){
    save_flags
    LDFLAGS="$LDFLAGS $*"
}

temp_extralibs(){
    save_flags
    extralibs="$extralibs $*"
}

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append(){
    var=$1
    shift
    flags_saved && eval "SAVE_$var=\"\$SAVE_$var $*\""
    eval "$var=\"\$$var $*\""
}

add_cflags(){
    append CFLAGS "$@"
}

add_ldflags(){
    append LDFLAGS "$@"
}

add_extralibs(){
    append extralibs "$@"
}

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check_cmd(){
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    log "$@"
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    "$@" >>$logfile 2>&1
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}

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check_cc(){
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    log check_cc "$@"
    cat >$TMPC
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    log_file $TMPC
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    check_cmd $cc $CFLAGS "$@" -c -o $TMPO $TMPC
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}

check_cpp(){
    log check_cpp "$@"
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    cat >$TMPC
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    log_file $TMPC
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    check_cmd $cc $CFLAGS "$@" -E -o $TMPO $TMPC
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}

check_ld(){
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    log check_ld "$@"
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    check_cc || return
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    check_cmd $cc $LDFLAGS "$@" -o $TMPE $TMPO $extralibs
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}

check_cflags(){
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    log check_cflags "$@"
    check_cc "$@" <<EOF && add_cflags "$@"
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int x;
EOF
}

check_ldflags(){
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    log check_ldflags "$@"
    check_ld "$@" <<EOF && add_ldflags "$@"
int main(){
    return 0;
}
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EOF
}

check_header(){
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    log check_header "$@"
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    header=$1
    shift
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    var=`echo $header | sed 's/[^A-Za-z0-9_]/_/g'`
    disable $var
    check_cpp "$@" <<EOF && enable $var
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#include <$header>
int x;
EOF
}

check_func(){
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    log check_func "$@"
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    func=$1
    shift
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    disable $func
    check_ld "$@" <<EOF && enable $func
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extern int $func();
int main(){
    $func();
}
EOF
}

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check_lib(){
    log check_lib "$@"
    header="$1"
    func="$2"
    shift 2
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    check_header $header && check_func $func "$@" && add_extralibs "$@"
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}

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check_exec(){
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    check_ld "$@" && { enabled cross_compile || $TMPE >>$logfile 2>&1; }
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}

require(){
    name="$1"
    header="$2"
    func="$3"
    shift 3
    check_lib $header $func "$@" || die "ERROR: $name not found"
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}

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apply(){
    file=$1
    shift
    "$@" < "$file" > "$file.tmp" && mv "$file.tmp" "$file" || rm "$file.tmp"
}

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CONFIG_LIST='
    encoders
    decoders
    parsers
    muxers
    demuxers
    amr
    amr_nb
    amr_nb_fixed
    amr_wb
    audio_beos
    audio_oss
    avisynth
    beos_netserver
    bktr
    dc1394
    dv1394
    ffmpeg
    ffplay
    ffserver
    gpl
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    gprof
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    ipv6
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    liba52
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    liba52bin
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    libdts
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    libfaac
    libfaad
    libfaadbin
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    libgsm
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    libmp3lame
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    libnut
    libogg
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    libtheora
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    libvorbis
    memalign_hack
    mpegaudio_hp
    network
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    powerpc_perf
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    pp
    protocols
    swscaler
    vhook
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    v4l
    v4l2
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    wince
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    x11grab
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    x264
    xvid
    zlib
'

HAVE_LIST='
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    altivec
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    altivec_h
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    armv5te
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    armv6
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    beosthreads
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    byteswap_h
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    cmov
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    dcbzl
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    dev_bktr_ioctl_bt848_h
    dev_bktr_ioctl_meteor_h
    dev_ic_bt8xx_h
    dev_video_meteor_ioctl_meteor_h
    dev_video_bktr_ioctl_bt848_h
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    dlfcn_h
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    dlopen
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    fast_cmov
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    freetype2
    imlib2
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    inet_aton
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    iwmmxt
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    localtime_r
    lrintf
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    machine_ioctl_bt848_h
    machine_ioctl_meteor_h
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    malloc_h
    memalign
    mlib
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    mmi
    mmx
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    os2
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    os2threads
    pthreads
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    sdl
    sdl_video_size
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    soundcard_h
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    sys_poll_h
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    sys_soundcard_h
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    threads
    w32threads
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'
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TARGET_LIST='
    altivec
    armv5te
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    armv6
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    iwmmxt
    mmi
    mmx
'

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CMDLINE_SELECT="
    $CONFIG_LIST
    $TARGET_LIST
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    amr_if2
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    debug
    extra_warnings
    shared
    static
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    beosthreads
    os2threads
    pthreads
    w32threads
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"

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flashsv_decoder_deps="zlib"
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flashsv_encoder_deps="zlib"
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mpeg_xvmc_decoder_deps="xvmc"
png_decoder_deps="zlib"
png_encoder_deps="zlib"
x264_encoder_deps="x264"
xvid_encoder_deps="xvid"
zmbv_decoder_deps="zlib"
zmbv_encoder_deps="zlib"

aac_decoder_deps="libfaad"
mpeg4aac_decoder_deps="libfaad"
amr_nb_decoder_deps_any="amr_nb amr_nb_fixed"
amr_nb_encoder_deps_any="amr_nb amr_nb_fixed"
amr_wb_decoder_deps="amr_wb"
amr_wb_encoder_deps="amr_wb"
dts_decoder_deps="libdts"
faac_encoder_deps="libfaac"
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liba52_decoder_deps="liba52"
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libgsm_decoder_deps="libgsm"
libgsm_encoder_deps="libgsm"
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libtheora_encoder_deps="libtheora"
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mp3lame_encoder_deps="libmp3lame"
oggvorbis_decoder_deps="libvorbis"
oggvorbis_encoder_deps="libvorbis"

audio_demuxer_deps_any="audio_oss audio_beos"
audio_muxer_deps_any="audio_oss audio_beos"
dc1394_demuxer_deps="dc1394"
dv1394_demuxer_deps="dv1394"
gxf_muxer_deps="gpl"
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libnut_demuxer_deps="libnut"
libnut_muxer_deps="libnut"
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ogg_muxer_deps="libogg"
redir_demuxer_deps="network"
rtp_muxer_deps="network"
rtsp_demuxer_deps="network"
sdp_demuxer_deps="network"
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v4l2_demuxer_deps="v4l2"
video_grab_device_demuxer_deps_any="v4l bktr"
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x11_grab_device_demuxer_deps="x11grab"

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ffplay_deps="sdl"
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ffserver_deps="network protocols muxers"
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network_deps="protocols"
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# set temporary file name
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if test ! -z "$TMPDIR" ; then
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    TMPDIR1="${TMPDIR}"
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elif test ! -z "$TEMPDIR" ; then
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    TMPDIR1="${TEMPDIR}"
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else
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    TMPDIR1="/tmp"
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fi

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TMPC="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.c"
TMPO="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.o"
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TMPE="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}"
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TMPS="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.S"
TMPH="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.h"

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# default parameters
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logging="yes"
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logfile="config.err"
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# installation paths
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PREFIX="/usr/local"
libdir='${PREFIX}/lib'
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shlibdir="$libdir"
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incdir='${PREFIX}/include/ffmpeg'
mandir='${PREFIX}/man'
bindir='${PREFIX}/bin'
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# toolchain
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cross_prefix=""
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cross_compile="no"
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cc="gcc"
ar="ar"
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ranlib="ranlib"
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make="make"
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strip="strip"
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asmalign_pot="unknown"

# machine
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arch=`uname -m`
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cpu="generic"
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powerpc_perf="no"
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mmx="default"
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cmov="no"
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fast_cmov="no"
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armv5te="default"
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armv6="default"
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iwmmxt="default"
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altivec="default"
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dcbzl="no"
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mmi="default"
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bigendian="no"

# OS
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targetos=`uname -s`
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beos_netserver="no"
mingw32="no"
os2="no"
wince="no"

# non-library system interfaces
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audio_beos="default"
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audio_oss="yes"
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bktr="yes"
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dv1394="yes"
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v4l2="yes"
v4l="yes"
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# libraries
amr_if2="no"
amr_nb="no"
amr_nb_fixed="no"
amr_wb="no"
avisynth="no"
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dc1394="no"
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dlfcn_h="no"
dlopen="no"
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liba52="no"
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liba52bin="no"
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libdts="no"
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libfaac="no"
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libfaad2="no"
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libfaad="no"
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libfaadbin="no"
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libgsm="no"
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libmp3lame="no"
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libnut="no"
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libogg="no"
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libtheora="no"
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libvorbis="no"
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mlib="no"
x11grab="no"
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x264="no"
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xvid="no"
zlib="yes"

# configurable options
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debug="yes"
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dostrip="yes"
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extra_warnings="no"
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ffmpeg="yes"
ffplay="yes"
ffserver="yes"
gpl="no"
gprof="no"
ipv6="yes"
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shared="no"
static="yes"
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memalign_hack="no"
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mpegaudio_hp="yes"
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network="yes"
optimize="yes"
pp="no"
protocols="yes"
swscaler="no"
vhook="default"

# threading
beosthreads="no"
os2threads="no"
pthreads="no"
w32threads="no"
thread_type="no"

# build settings
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SHFLAGS='-shared -Wl,-soname,$@'
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VHOOKSHFLAGS='$(SHFLAGS)'
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LIBOBJFLAGS=""
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FFLDFLAGS=-Wl,--warn-common
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LDLATEFLAGS='-Wl,-rpath-link,\$(BUILD_ROOT)/libavcodec -Wl,-rpath-link,\$(BUILD_ROOT)/libavformat -Wl,-rpath-link,\$(BUILD_ROOT)/libavutil'
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FFSERVERLDFLAGS=-Wl,-E
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LDCONFIG="ldconfig"
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LIBPREF="lib"
LIBSUF=".a"
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LIB='$(LIBPREF)$(NAME)$(LIBSUF)'
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SLIBPREF="lib"
SLIBSUF=".so"
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SLIBNAME='$(SLIBPREF)$(NAME)$(SLIBSUF)'
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SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
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EXESUF=""
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BUILDSUF=""
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LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(libdir)/$(LIB)"'
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# find source path
source_path="`dirname \"$0\"`"
source_path_used="yes"
if test -z "$source_path" -o "$source_path" = "." ; then
    source_path="`pwd`"
    source_path_used="no"
else
    source_path="`cd \"$source_path\"; pwd`"
    echo "$source_path" | grep -q '[[:blank:]]' &&
      die "Out of tree builds are impossible with whitespace in source path."
fi

if test x"$1" = x"-h" -o x"$1" = x"--help" ; then
    show_help
fi

FFMPEG_CONFIGURATION="$@"

ENCODER_LIST=`sed -n 's/^[^#]*ENC.*, *\(.*\)).*/\1_encoder/p' "$source_path/libavcodec/allcodecs.c"`
DECODER_LIST=`sed -n 's/^[^#]*DEC.*, *\(.*\)).*/\1_decoder/p' "$source_path/libavcodec/allcodecs.c"`
PARSER_LIST=`sed -n 's/^[^#]*PARSER.*, *\(.*\)).*/\1_parser/p' "$source_path/libavcodec/allcodecs.c"`
MUXER_LIST=`sed -n 's/^[^#]*_MUX.*, *\(.*\)).*/\1_muxer/p' "$source_path/libavformat/allformats.c"`
DEMUXER_LIST=`sed -n 's/^[^#]*DEMUX.*, *\(.*\)).*/\1_demuxer/p' "$source_path/libavformat/allformats.c"`

enable $ENCODER_LIST $DECODER_LIST $PARSER_LIST $MUXER_LIST $DEMUXER_LIST

die_unknown(){
    echo "Unknown option \"$1\"."
    echo "See $0 --help for available options."
    exit 1
}

for opt do
  optval="${opt#*=}"
  case "$opt" in
  --log)
  ;;
  --log=*) logging="$optval"
  ;;
  --prefix=*) PREFIX="$optval"
  ;;
  --libdir=*) libdir="$optval"
  ;;
  --shlibdir=*) shlibdir="$optval"
  ;;
  --incdir=*) incdir="$optval"
  ;;
  --mandir=*) mandir="$optval"
  ;;
  --source-path=*) source_path="$optval"
  ;;
  --cross-prefix=*) cross_prefix="$optval"
  ;;
  --cross-compile) cross_compile="yes"
  ;;
  --target-os=*) targetos="$optval"
  ;;
  --cc=*) cc="$optval"
  ;;
  --make=*) make="$optval"
  ;;
  --extra-cflags=*) add_cflags "$optval"
  ;;
  --extra-ldflags=*) add_ldflags "$optval"
  ;;
  --extra-libs=*) add_extralibs "$optval"
  ;;
  --build-suffix=*) BUILDSUF="$optval"
  ;;
  --arch=*) arch="$optval"
  ;;
  --cpu=*) cpu="$optval"
  ;;
  --enable-mingwce) wince="yes"
  ;;
  --disable-opts) optimize="no"
  ;;
  --enable-small) optimize="small"
  ;;
  --enable-sunmlib) mlib="yes"
  ;;
  --disable-strip) dostrip="no"
  ;;
  --disable-encoders) disable $ENCODER_LIST
  ;;
  --disable-decoders) disable $DECODER_LIST
  ;;
  --disable-muxers) disable $MUXER_LIST
  ;;
  --disable-demuxers) disable $DEMUXER_LIST
  ;;
  --disable-parsers) disable $PARSER_LIST
  ;;
  --enable-*=*|--disable-*=*)
  eval `echo "$opt" | sed 's/=/-/;s/--/action=/;s/-/ thing=/;s/-/ name=/'`
  case "$thing" in
      encoder|decoder|muxer|demuxer|parser) $action ${optval}_${thing} ;;
      *) die_unknown "$opt" ;;
  esac
  ;;
  --enable-?*|--disable-?*)
  eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
  echo "$CMDLINE_SELECT" | grep -q "^ *$option\$" || die_unknown $opt
  $action $option
  ;;
  --help) show_help
  ;;
  *)
  die_unknown $opt
  ;;
  esac
done

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case "$arch" in
  i386|i486|i586|i686|i86pc|BePC)
    arch="x86_32"
  ;;
  x86_64|amd64)
    arch="x86_32"
    canon_arch="`$cc -dumpmachine | sed -e 's,\([^-]*\)-.*,\1,'`"
    if [ x"$canon_arch" = x"x86_64" -o x"$canon_arch" = x"amd64" ]; then
      if [ -z "`echo $CFLAGS | grep -- -m32`"  ]; then
        arch="x86_64"
      fi
    fi
  ;;
  # armv4l is a subset of armv[567]*l
  arm|armv[4567]*l)
    arch="armv4l"
  ;;
  alpha)
    arch="alpha"
  ;;
  "Power Macintosh"|ppc|ppc64|powerpc)
    arch="powerpc"
  ;;
  mips|mipsel|IP*)
    arch="mips"
  ;;
  sun4u|sparc64)
    arch="sparc64"
  ;;
  sparc)
    arch="sparc"
  ;;
  sh4)
    arch="sh4"
  ;;
  parisc|parisc64)
    arch="parisc"
  ;;
  s390|s390x)
    arch="s390"
  ;;
  m68k)
    arch="m68k"
  ;;
  ia64)
    arch="ia64"
  ;;
  bfin)
    arch="bfin"
  ;;
  *)
    arch="unknown"
  ;;
esac

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# OS specific
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osextralibs="-lm"
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case `tolower $targetos` in
  beos|haiku|zeta)
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    PREFIX="$HOME/config"
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    # helps building libavcodec
    add_cflags "-DPIC -fomit-frame-pointer"
    # 3 gcc releases known for BeOS, each with ugly bugs
    gcc_version="`$cc -v 2>&1 | grep version | cut -d ' ' -f3-`"
    case "$gcc_version" in
      2.9-beos-991026*|2.9-beos-000224*) echo "R5/GG gcc"
        mmx="no"
        ;;
      *20010315*) echo "BeBits gcc"
        add_cflags "-fno-expensive-optimizations"
        ;;
    esac
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    LDCONFIG="echo ignoring ldconfig"
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    SHFLAGS=-nostart
    # disable Linux things
    dv1394="no"
    # enable BeOS things
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    disabled audio_beos || enable_audio_beos
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    # no need for libm, but the inet stuff
    # Check for BONE
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    # XXX: actually should check for NOT net_server
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    if (echo $BEINCLUDES|grep 'headers/be/bone' >/dev/null); then
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        osextralibs="-lbind -lsocket"
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    else
        beos_netserver="yes"
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        osextralibs="-lnet"
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    fi ;;
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  sunos)
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    dv1394="no"
    FFLDFLAGS=""
    FFSERVERLDFLAGS=""
    SHFLAGS="-shared -Wl,-h,\$@"
    add_extralibs "-lsocket -lnsl"
    ;;
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  netbsd)
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    dv1394="no"
    add_extralibs "-lossaudio"
    ;;
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  openbsd)
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    dv1394="no"
    need_memalign="no"
    LIBOBJFLAGS="\$(PIC)"
    LDCONFIG="ldconfig -m \$(shlibdir)"
    SHFLAGS='-shared'
    SLIBNAME='$(SLIBPREF)$(NAME)$(SLIBSUF).$(LIBVERSION)'
    SLIBNAME_WITH_VERSION='$(SLIBNAME)'
    SLIBNAME_WITH_MAJOR='$(SLIBNAME)'
    add_extralibs "-lossaudio"
    ;;
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  freebsd)
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    dv1394="no"
    need_memalign="no"
    add_cflags "-pthread"
    ;;
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  gnu/kfreebsd)
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    dv1394="no"
    add_cflags "-pthread"
    ;;
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  bsd/os)
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    dv1394="no"
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    osextralibs="-lpoll -lgnugetopt -lm"
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    strip="strip -d"
    ;;
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  darwin)
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    cc="cc"
    dv1394="no"
    need_memalign="no"
    SHFLAGS="-dynamiclib -Wl,-single_module -Wl,-install_name,\$(shlibdir)/\$(SLIBNAME),-current_version,\$(SPPVERSION),-compatibility_version,\$(SPPVERSION) -Wl,-read_only_relocs,suppress"
    VHOOKSHFLAGS='-dynamiclib -Wl,-single_module -flat_namespace -undefined suppress -Wl,-install_name,$(shlibdir)/vhook/$@'
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    osextralibs=""
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    strip="strip -x"
    FFLDFLAGS="-Wl,-dynamic,-search_paths_first"
    SLIBSUF=".dylib"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME).$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME).$(LIBMAJOR)$(SLIBSUF)'
    FFSERVERLDFLAGS=-Wl,-bind_at_load
    ;;
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  mingw32*)
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    mingw32="yes"
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    if enabled_all shared static; then
        cat <<EOF
You can only build one library type at once on MinGW.
Specify --disable-static --enable-shared to only build
the shared libraries. To build only the static libraries
you do not need to pass additional options.
EOF
        exit 1
    fi
    dv1394="no"
    ffserver="no"
    network="no"
    if enabled wince; then
        protocols="no"
    fi
    SLIBPREF=""
    SLIBSUF=".dll"
    EXESUF=".exe"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)-$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME)-$(LIBMAJOR)$(SLIBSUF)'
    SLIB_EXTRA_CMD="-lib /machine:i386 /def:\$(@:${SLIBSUF}=.def)"
    SLIB_INSTALL_EXTRA_CMD="-install -m 644 \$(SLIBNAME_WITH_MAJOR:\$(SLIBSUF)=.lib) \"\$(shlibdir)/\$(SLIBNAME_WITH_MAJOR:\$(SLIBSUF)=.lib)\""
    SHFLAGS="-shared -Wl,--output-def,\$(@:${SLIBSUF}=.def),--out-implib,lib\$(SLIBNAME:\$(SLIBSUF)=.dll.a) -Wl,--enable-runtime-pseudo-reloc"
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    ;;
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  cygwin*)
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    targetos=CYGWIN
    shlibdir="$bindir"
    dv1394="no"
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    VHOOKSHFLAGS='-shared -L$(BUILD_ROOT)/libavformat -L$(BUILD_ROOT)/libavcodec -L$(BUILD_ROOT)/libswscale -L$(BUILD_ROOT)/libavutil'
    VHOOKLIBS='-lavformat$(BUILDSUF) -lavcodec$(BUILDSUF) -lswscale$(BUILDSUF) -lavutil$(BUILDSUF) $(EXTRALIBS)'
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    osextralibs=""
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    EXESUF=".exe"
    SLIBPREF="cyg"
    SLIBSUF=".dll"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)-$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME)-$(LIBMAJOR)$(SLIBSUF)'
    SHFLAGS='-shared -Wl,--out-implib=lib$(NAME).dll.a'
    ;;
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  linux)
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    LDLATEFLAGS="-Wl,--as-needed $LDLATEFLAGS"
    ;;
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  irix*)