WITHOUT_CLANG_IS_CC revision 259065 
 $FreeBSD: releng/10.0/tools/build/options/WITHOUT_CLANG_IS_CC 242629 2012-11-05 21:53:23Z brooks $
Set to install the GCC compiler as

a /usr/bin/cc ,

a /usr/bin/c++
and

a /usr/bin/cpp .