"Drummonds, Scott B" <scott.b.drummonds@xxxxxxxxx> writes: > what macro is generating the "checking for ANSI C header > files..." test? AC_HEADER_STDC > Second, which macro is generating the "checking for suffix of object > files..." test? _AC_COMPILER_OBJEXT. It's an internal macro. You can look in the Autoconf source code to see who calls it. "grep -r", for example. > Third, is this the intended operation of autoconf? No. It should work without your having to worry about it.