incorrect CFLAGS handling

[olh at suse.de (Olaf Hering)]

What is the purpose of $(CFLAGS) $(EXTRA_CFLAGS) all over the place?
Normally 'CFLAGS="$foo" ./configure' is supposed to use $foo as gcc
options. But configure.ac has its own idea what the CFLAGS/EXTRA_CFLAGS
should be. There is no way to override it without adding lots of
knowledge about EXTRA_FLAGS handling to the rpm spec file.
Can this be fixed please?