Was someone able to compile the Bochs simulator under Snow Leopard. Leopard worked fine for me but under Snow Leopard I get alot of problems related to the Carbon library...
In addition to James said (adding the -m32 switch), you may need to add "-arch i386" too.
Here's a modified conf file that I used to build:
set echo
CFLAGS="-arch i386 -m32 -pipe -O3 -I/sw/include -fomit-frame-pointer -finline-functions -falign-loops=16 -falign-jumps=16 -falign-functions=16 -falign-labels=16 -falign-loops-max-skip=15 -falign-jumps-max-skip=15 -fprefetch-loop-arrays $CFLAGS"
CPATH="/sw/include"
CPPFLAGS=""
CXXFLAGS="$CFLAGS"
LDFLAGS="-arch i386 -m32 -L/sw/lib"
CXX="g++ -arch i386 -m32"
export CFLAGS
export CPATH
export CPPFLAGS
export CXXFLAGS
export LDFLAGS
export CXX
./configure --enable-sb16 \
--enable-ne2000 \
--enable-all-optimizations \
--enable-cpu-level=6 \
--enable-x86-64 \
--enable-sse=2 \
--enable-pci \
--enable-acpi \
--enable-debugger \
--enable-clgd54xx \
--enable-usb \
--enable-plugins \
${CONFIGURE_ARGS}