http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57753
--- Comment #4 from Jack Howarth <howarth at nitro dot med.uc.edu> --- Actually, FSF gcc doesn't know about the SDKROOT path that xcrun sets. A change similar to… http://permalink.gmane.org/gmane.comp.compilers.clang.scm/56103 needs to be implemented on darwin so that FSF checks for the SDKROOT environmental and uses it to find usr/include.
