How to compile CFITSIO as a Universal Binary on Mac OS-X These instructions are for compiling CFITSIO so that is can be linked with code running on a Mac OS-X machine with either an Intel processor or a Power PC processor. Unzip the CFITSIO library: tar xzf cfitsio3060.tar.gz (or whatever version this is) cd cfitsio/ copy the cfitsio-xcodeproj.zip file here. This project file was kindly supplied by Lars Holm Nielsen of the ESA/ESO/NASA Photoshop FITS Liberator project. unzip cfitsio-xcodeproj.zip start Xcode and open cfitsio.xcodeproj right-click on Targets -> Build PPC -> Build Build PPC when that finishes...: right-click on Targets -> Build i386 -> Build Build i386 when that finishes...: right-click on Targets -> Build Universal -> Build Build Universal (For some reason clicking on the menu "Build" icon doesn't seem to work correctly, but the right-click menus do). The static library (universal binary) is now available in the CFITSIO root directory (libcfitsio.a) Another way to build the universal binary: unpack the cfitsio source code tar file cd cfitsio setenv CFLAGS "-arch ppc -arch i386 -g -O2" Then proceed with the standard cfitsio build, i.e.: ./configure make make install Return to the FITSIO home page. FITSIO is maintained by: Dr. William D. Pence, (email: pence 'at' milkyway.gsfc.nasa.gov)