Hi, The LLVM release notes say that MacRuby v0.6 will work with 2.7 (http://llvm.org/releases/2.7/docs/ReleaseNotes.html), but I'm having trouble with it: """ $ rake (in /Users/mbolingbroke/Programming/Checkouts/MacRuby-0.6) /usr/bin/ruby tool/compile_prelude.rb prelude.rb miniprelude.c.new rm miniprelude.c.new /usr/bin/g++-4.2 -I/usr/local/include -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -O2 -fno-rtti -fno-common -Woverloaded-virtual -I. -I./include -g -Wall -arch i386 -arch x86_64 -Wno-parentheses -Wno-deprecated-declarations -Werror -I./icu-1060 -c main.cpp -o main.o In file included from main.cpp:8: llvm.h:12:33: error: llvm/ModuleProvider.h: No such file or directory In file included from main.cpp:17: vm.h:602: error: ISO C++ forbids declaration of ‘ExistingModuleProvider’ with no type vm.h:602: error: expected ‘;’ before ‘*’ token In file included from main.cpp:8: llvm.h:12:33: error: llvm/ModuleProvider.h: No such file or directory In file included from main.cpp:17: vm.h:602: error: ISO C++ forbids declaration of ‘ExistingModuleProvider’ with no type vm.h:602: error: expected ‘;’ before ‘*’ token lipo: can't figure out the architecture type of: /var/folders/4j/4jTZECFrFIyDlJjF8ivIeE+++TI/-Tmp-//ccJH4WrV.out rake aborted! """ Perhaps you didn't find time to support LLVM 2.7 in the v0.6 timeframe after all? Or is this unexpected behaviour? Cheers, Max