cross compilation x86_64 <-> i386

Hello list,

This may be regarded as slightly off-topic, but I do not know a better place
where to ask the question. I have installed FC6 x86_64 on my new system and
I am having problems compiling packages in 32 bits and 64 bits. Freetype is
one package I need to compile for both architectures, especially that I
systematically recompile it with bci enabled. I tried the following, quite
naively it seems:

rpmbuild -bb freetype.spec -bb --target i386

Errors follow soon after.

checking build system type... x86_64-redhat-linux-gnu
checking host system type... x86_64-redhat-linux-gnu
checking target system type... i386-redhat-linux-gnu
checking for x86_64-redhat-linux-gnu-gcc... no
checking for gcc... gcc
checking for C compiler default output file name... configure: error: C
compiler cannot create executables
See `config.log' for more details.
make: *** [setup] Error 77
error: Bad exit status from /var/tmp/rpm-tmp.65705 (%build)

I have been googling but haven't yet found the right recipe. Please let me
know if you have one around. Thank you!