can't install mod_bw on Mac OS X 10.8

[occcccc]

can't compile mod_bw.c with apxs -i -a -c mod_bw.c command, output as follow:

/usr/share/apr-1/build-1/libtool --silent --mode=compile /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.8.xctoolchain/usr/bin/cc -DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -I/usr/local/include -I/usr/include/apache2 -I/usr/include/apr-1 -I/usr/include/apr-1 -c -o mod_bw.lo mod_bw.c && touch mod_bw.slo
env: /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.8.xctoolchain/usr/bin/cc: No such file or directory
apxs:Error: Command failed with rc=65536
.

can anyone help?