I don't know the build system for this program (and this is a generic bug template so I cannot tell you which program exactly is), but my tests shows that it's not respecting CFLAGS properly. Please look into it, since it's important to respect user CFLAGS. Thanks, Diego
I have had a look: this is a C++ program. It seems to me that CXXFLAGS are respected. Could it be you (or some script of yours) came to miss CFLAGS as source files are named *.C, e.g. format.C?
Closing, please re-open as needed.