version: 2.0.1
source: http://www.libexpat.org/

parallel: OK

Note: this is mainly to make sure we have one, and it's in a consistent location. In Mac OS X Tiger, libexpat is in X11. But on OS X Server, you don't normally install X11, yet libexpat is in the Apache 2 distribution on Server. Starting with Leopard, expat 1.5 is included in the system. Bleh. All a bit old.

in expat source dir:

export MACOSX_DEPLOYMENT_TARGET=10.6
./configure --mandir=/usr/local/share/man \
CFLAGS="-Os -arch i386 -arch x86_64"
make
sudo make install

in expat source dir:

export MACOSX_DEPLOYMENT_TARGET=10.5
./configure --mandir=/usr/local/share/man \
CFLAGS="-Os -arch i386 -arch x86_64 -arch ppc -arch ppc64"

add at end:

#undef BYTEORDER
#ifdef __BIG_ENDIAN__
  #define BYTEORDER 4321
#else
  #define BYTEORDER 1234
#endif
#undef WORDS_BIGENDIAN
#ifdef __BIG_ENDIAN__
  #define WORDS_BIGENDIAN 1
#else
  #undef WORDS_BIGENDIAN
#endif

make
sudo make install

in expat source dir:

export MACOSX_DEPLOYMENT_TARGET=10.4
./configure --mandir=/usr/local/share/man \
CFLAGS="-Os -arch i386 -arch ppc -isysroot /Developer/SDKs/MacOSX10.4u.sdk"

add at end:

#undef BYTEORDER
#ifdef __BIG_ENDIAN__
  #define BYTEORDER 4321
#else
  #define BYTEORDER 1234
#endif
#undef WORDS_BIGENDIAN
#ifdef __BIG_ENDIAN__
  #define WORDS_BIGENDIAN 1
#else
  #undef WORDS_BIGENDIAN
#endif

make
sudo make install

in expat source dir:

./configure --mandir=/usr/local/share/man
make
sudo make install