Patch from Michael Jerris.

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All public include files installed in ${sofiadir} are now in sofia-sip
subdirectories. They are installed to ${sofiadir}/sofia-sip, too.

${sofiadir} is defined by configure script relative to your ${prefix}, by
default ${sofidir} is ${prefix}/include/sofia-sip-1.11. The default prefix
is /usr/local and ${sofiadir} is /usr/local/include/sofia-sip-1.11. When
using package manager, the ${prefix} is usually /usr and ${sofiadir} is
/usr/include/sofia-sip-1.11.

The public include files should be referenced using sofia-sip path, e.g.,
<sofia-sip/su.h>.

You can either fix your applications to use the new include file names
with the fix-include-sofia-sip sed script found in scripts/ directory, or
add both ${sofiadir} and ${sofiadir}/sofia-sip into your include path,
e.g.,

INCLUDES

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