The make file in hw/xfree86/dixmods does not use the required -I option to get <GL/gl.h> from the 'gl' package on my system. So build of glxmodule.o fails with "GL/gl.h not found" "pkg-config --cflags gl" does give the required -I option.
Mass closure: This bug has been untouched for more than six years, and is not obviously still valid. Please file a new report if you continue to experience issues with a current server.
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