http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48949
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-14 10:20:34 UTC --- (In reply to comment #8) > > Please answer comment #3. > > Answers provided on bug report 50944. Clearly the system complex.h is being used, does that mean that the header hasn't been fixincluded at all? The diff is against a wrong header, you are diffing system complex.h against C++. Can you look into your logs if you have message like: Applying solaris_complex to complex.h in your build log? Can you look into your build tree if you have gcc/include-fixed/complex.h header? Did it get installed? /usr/local/gcc-4.6.0/x86_64-SunOS-core2/lib/gcc/i386-pc-solaris2.10/4.6.0/include-fixed/complex.h would be the installed location of the file.