-dnl define some stuff required for --fullversion
-AC_DEFINE_UNQUOTED(VERSION_CONFIGURE_ARGS, "$ac_configure_args", [configure arguments])
-AC_DEFINE_UNQUOTED(VERSION_CC, "$CC", [CC used])
-AC_DEFINE_UNQUOTED(VERSION_CXX, "$CXX", [CXX used])
-AC_DEFINE_UNQUOTED(VERSION_CFLAGS, "$OPT_CFLAGS $ARCH_CFLAGS $CC_FLAGS $CPPFLAGS", [CFLAGS used])
-AC_DEFINE_UNQUOTED(VERSION_CXXFLAGS, "$OPT_CXXFLAGS $ARCH_CXXFLAGS $CXX_FLAGS $CPPFLAGS", [CXXFLAGS used])