Until this is fixed, Firefox won't build in the ActionMonkey branch: gmake[5]: Entering directory `/Users/jason/dev/am/actionmonkey-firefox/obj-ff-debug/js/src/xpconnect/src' nsScriptError.cpp c++ -o nsScriptError.o -c -I../../../../dist/include/system_wrappers -include /Users/jason/dev/am/actionmonkey-firefox/config/gcc_hidden.h -DMOZILLA_INTERNAL_API -DOSTYPE=\"Darwin8.10.1\" -DOSARCH=Darwin -DJSFILE -DJS_THREADSAFE -DEXPORT_XPC_API -I/Users/jason/dev/am/actionmonkey-firefox/js/src/xpconnect/src/../loader -I../../../../dist/include/xpcom -I../../../../dist/include/string -I../../../../dist/include/js -I../../../../dist/include/caps -I../../../../dist/include/necko -I../../../../dist/include/dom -I../../../../dist/include -I../../../../dist/include/xpconnect -I../../../../dist/include/nspr -DMOZ_PNG_READ -DMOZ_PNG_WRITE -I../../../../dist/sdk/include -fPIC -fno-rtti -fno-exceptions -Wall -Wconversion -Wpointer-arith -Wcast-align -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wno-long-long -isysroot /Developer/SDKs/MacOSX10.4u.sdk -fpascal-strings -no-cpp-precomp -fno-common -fshort-wchar -I/Developer/SDKs/MacOSX10.4u.sdk/Developer/Headers/FlatCarbon -pipe -DDEBUG -D_DEBUG -DDEBUG_jason -DTRACING -g -O -DMOZILLA_CLIENT -include ../../../../mozilla-config.h -Wp,-MD,.deps/nsScriptError.pp /Users/jason/dev/am/actionmonkey-firefox/js/src/xpconnect/src/nsScriptError.cpp In file included from ../../../../dist/include/js/jsobj.h:51, from ../../../../dist/include/js/jsscope.h:47, from ../../../../dist/include/js/jslock.h:116, from ../../../../dist/include/js/jsatom.h:53, from ../../../../dist/include/js/jscntxt.h:49, from /Users/jason/dev/am/actionmonkey-firefox/js/src/xpconnect/src/xpcprivate.h:82, from /Users/jason/dev/am/actionmonkey-firefox/js/src/xpconnect/src/nsScriptError.cpp:45: ../../../../dist/include/js/jsgc.h:50:18: error: MMgc.h: No such file or directory

bsmedberg suggested on IRC: 2007-08-09 17:04:12 -0400 <bsmedberg> the easiest way to fix bug 391585 is to install the MMGC headers into dist/include/js