http://www.danns.co.uk/HowToBuildUniversalSDK

Apologies if you have difficulty accessing it. It’s currently hosted on a home server.

Download Dave’s build, and extract (the folder will be gecko-sdk-mac-intel-1.8.1.3). Download ppc build from http://releases.mozilla.org/pub/mozilla.org/xulrunner/releases/1.8.1.3/contrib/sdk/ . Extract and rename folder from gecko-sdk to gecko-sdk-mac-ppc-1.8.1.3. Create a copy of the Intel version (I chose Dave’s as my base, because there are some slight differences in header files with the Intel ones having more #define lines).

$ cp -R gecko-sdk-mac-intel-1.8.1.3/ gecko-sdk

Then remove the libraries from the copy.

$ rm gecko-sdk/lib/*

The tool to use is lipo, see LIPO(1) for more info. I’m using a `sh’ for loop to streamline creating the Mach-O fat file:

$ for library in $(ls gecko-sdk-mac-intel-1.8.1.3/lib/); do lipo -create -output gecko-sdk/lib/${library} -arch ppc gecko-sdk-mac-ppc-1.8.1.3/lib/${library} -arch i386 gecko-sdk-mac-intel-1.8.1.3/lib/${library}; done

Test to see that it worked:

$ ls gecko-sdk/lib/

libembed_base_s.a libplc4.dylib libxpcom.dylib libxpcomglue_s.a

libnspr4.dylib libplds4.dylib libxpcomglue.a

$ file gecko-sdk/lib/libxpcom.dylib

gecko-sdk/lib/libxpcom.dylib: Mach-O fat file with 2 architectures

gecko-sdk/lib/libxpcom.dylib (for architecture ppc): Mach-O dynamically linked shared library ppc

gecko-sdk/lib/libxpcom.dylib (for architecture i386): Mach-O dynamically linked shared library i386

sudo port install libidl

and I was good to go.