Hi, I have a custom installation of gcc 4.8.1 in my home directory. However the include files in that installation have no extensions! (except for tgmath.h, fenv.h, complex.h, and cxxabi.h) Thus even if I include the installation include directory (for me under include/c++/4.8.1) in C_INCLUDE_PATH, it still goes to the system-wide gcc include files. Why do the include files in the gcc install not have extensions and will renaming them to have a .h extension fix the problem? Thanks --Sid