gcc problem - libtool: compile: unable to infer tagged configuration

I'm trying to use rpmbuild on lame.3.94b. If I run a manual make command. It compiles without a problem. However, if I try using the spec file I get a libtool error: libtool: compile: unable to infer tagged configuration The scrit contains the following line: make CC="gcc3" CFLAGS="${CC_OPTS}" test and if I understand correctly CC_OPTS is defined as: %ifarch athlon export CC_OPTS="-O3 -fomit-frame-pointer -fno-strength-reduce -mcpu=athlon -march=athlon -malign-functions=4 -funroll-loops -fexpensive-optimizations -fschedule-insns2 -Wall -mfancy-math-387 -pipe" Does anyone understand the error and can point me in the right direction towards fixing it? Thanks. Eddie