Error compiling sem.c on Darwin 10.2

Hello,

I've encountered the following error compiling with:

gcc -v
Reading specs from /usr/libexec/gcc/darwin/ppc/3.1/specs
Thread model: posix
Apple Computer, Inc. GCC version 1151, based on gcc version 3.1 20020420 (prerelease)"

Here's the error:

gcc -traditional-cpp -g -O2 -Wall -Wmissing-prototypes -Wmissing-declarations -I../../../../src/include -c -o sem.o sem.c
In file included from sem.c:30:
../../../../src/include/port/darwin/sem.h:66: warning: `union semun' declared inside parameter list
../../../../src/include/port/darwin/sem.h:66: warning: its scope is only this definition or declaration, which is probably not what you want
../../../../src/include/port/darwin/sem.h:66: warning: parameter has incomplete type
sem.c:67: warning: `union semun' declared inside parameter list
sem.c:68: parameter `arg' has incomplete type
make[4]: *** [sem.o] Error 1
make[3]: *** [darwin.dir] Error 2
make[2]: *** [port-recursive] Error 2
make[1]: *** [all] Error 2
make: *** [all] Error 2

Thanks so much!

(Please copy me, I'm not on any of the lists.)

Mike Johnson