How do I build OpenSSL as 32-bit (i386) on Mac OS X?

I downloaded OpenSSL sources, and did the config, make, sudo make install trilogy.

I then built my project, linking in libcrypto.a and libssl.a, but got:

ld: warning: in /usr/local/ssl/lib/libcrypto.a, file was built for unsupported file format which is not the architecture being linked (x86_64)
ld: warning: in /usr/local/ssl/lib/libssl.a, file was built for unsupported file format which is not the architecture being linked (x86_64)

I'm pretty sure I want to re-build OpenSSL as 32-bit (i386), because (for reasons not pertinent to this question) my project needs to be 32-bit.

How do I build OpenSSL as 32-bit on Mac OS X? (I didn't see anything about this in the "INSTALL" file.)