openal-soft .pc file compiling is broken i need help please

[LinuxDonald]

I found today that the .pc file compiling is broken in openal-soft.

When i compile openal-soft i become this .pc file:

prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}//usr/lib64
includedir=${prefix}/include

Name: OpenAL
Description: OpenAL is a cross-platform 3D audio API
Requires:
Version: 1.12.854
Libs: -L${libdir} -lopenal
Cflags: -I${includedir}


Can anyone please help me to fix it? Upstream need this patch too.
I have the CMakeLists.txt added to this mail.
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