wmpower-0.3.0 does not use CFLAGS specified in /etc/make.conf but rather sets CFLAGS="-O3 -fomit-frame-pointer -pipe -W -Wall" in the configure script. It also appends a value for '-march' based on grepping /proc/cpuinfo. Unfortunately, the checks for the -march value do not cover all CPU architectures and they also pose the problem of specifying "-march=pentium4 -O3" or "-march=athlon-4 -O3" which may prove problematic if compiling with older versions of gcc.
fixed in cvs