4.0b9 can fail to build (4.0b8 built with the same config) when JS_METHODJIT is not enabled because getJIT is not defined but is used: /usr/bin/g++-4.0 -arch ppc -o jsapi.o -c -I./../../dist/system_wrappers_js -include ./config/gcc_hidden.h -DOSTYPE=\"Darwin9.8.0\" -DOSARCH=Darwin -DEXPORT_JS_API -D__STDC_LIMIT_MACROS -DJS_HAS_CTYPES -DDLL_PREFIX=\"lib\" -DDLL_SUFFIX=\".dylib\" -Ictypes/libffi/include -I. -I. -I. -I./../../dist/include -I./../../dist/include/nsprpub -I/opt/local/include/nspr -I. -I./assembler -I./yarr -fPIC -I/opt/local/include -fno-rtti -fno-exceptions -Wall -Wpointer-arith -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wcast-align -Wno-invalid-offsetof -Wno-variadic-macros -pipe -ggdb3 -arch ppc -fno-strict-aliasing -fpascal-strings -fno-common -pthread -pipe -DNDEBUG -DTRIMMED -O2 -DUSE_SYSTEM_MALLOC=1 -DENABLE_ASSEMBLER=1 -DENABLE_JIT=1 -I/opt/local/include -DMOZILLA_CLIENT -include ./js-confdefs.h -MD -MF .deps/jsapi.pp jsapi.cpp jscntxt.h:2286: warning: ‘void js::MarkRuntime(JSTracer*)’: visibility attribute ignored because it jsgc.h:803: warning: conflicts with previous declaration here jsinterpinlines.h: In member function ‘bool js::InvokeSessionGuard::invoke(JSContext*) const’: jsinterpinlines.h:589: error: ‘struct JSScript’ has no member named ‘getJIT’ make[1]: *** [jsapi.o] Error 1 make: *** [default] Error 2