AC_CHECK_HEADERS(\
- OpenAL/al.h \
- al/al.h \ AudioUnit/AudioUnit.h \ CoreAudio/CoreAudio.h \ IOKit/IOKitLib.h \
Your patch checks for OpenAL headers only in these places. However my distro (Suse 10.1) puts openal headers to AL/ instead of al/ and so configure with the patch as-is doesn't find files on my system.
Also patching dlls/makefile.in fails. Had to patch it manually.
Leon