version: 3.10
source: http://heasarc.gsfc.nasa.gov/fitsio/

CFITSIO is slowly catching up to OSX Intel, but it still makes a couple assumptions about Macs that need to be fixed. Edit fitsio2.h.

First, find the bit that says defined(__powerpc64__) and change it to defined(__ppc64__).

Then, find the line:

(it should be right after a bunch of defined() tests for various intel processors). Replace the #define MACHINE IBMPC line after that with:

#if defined(__APPLE__)
#define MACHINE OTHERTYPE /* Mac Intel is not NATIVE and not IBMPC */
#else
#define MACHINE IBMPC
#endif

Save, and you're ready to compile.

In the cfitsio source:

export MACOSX_DEPLOYMENT_TARGET=10.5
./configure CFLAGS="-Os -arch ppc -arch i386 -arch ppc64 -arch x86_64"
make
sudo make install

In the cfitsio source:

export MACOSX_DEPLOYMENT_TARGET=10.4
./configure CFLAGS="-Os -arch ppc -arch i386"
make
sudo make install