Hi I've been trying to build the MacRuby trunk for a few weeks now, but can't get it to work. Via twitter I heard that r4303 fixed an issue with building, so I just gave it a shot with the following result: $ rake echo '' > .objs/kernel_data.c /Developer/usr/bin/llvm-gcc -arch i386 -fexceptions -fno-stack-protector -I. -I./include -I./icu-1060 --emit-llvm -c kernel.c -o .objs/kernel-i386.bc /usr/local/bin/opt -O3 .objs/kernel-i386.bc -o=.objs/kernel-i386.bc /bin/dd if=/dev/zero count=1 bs=1 conv=notrunc >> .objs/kernel-i386.bc 2>/dev/null /usr/bin/xxd -i .objs/kernel-i386.bc >> .objs/kernel_data.c /Developer/usr/bin/llvm-gcc -arch x86_64 -fexceptions -fno-stack-protector -I. -I./include -I./icu-1060 --emit-llvm -c kernel.c -o .objs/kernel-x86_64.bc /usr/local/bin/opt -O3 .objs/kernel-x86_64.bc -o=.objs/kernel-x86_64.bc /bin/dd if=/dev/zero count=1 bs=1 conv=notrunc >> .objs/kernel-x86_64.bc 2>/dev/null /usr/bin/xxd -i .objs/kernel-x86_64.bc >> .objs/kernel_data.c /usr/bin/gcc-4.2 -std=c99 -I. -I./include -fno-common -pipe -g -Wall -fexceptions -O3 -Wno-deprecated-declarations -Werror -arch i386 -arch x86_64 -I./icu-1060 -c array.c -o .objs/array.o Assertion failed: ((b->flags & flags) == flags), function rb_vm_prepare_block, file dispatcher.cpp, line 1773. Abort trap This is after installing r106781 of llvm as described in both the commit log and the updated README. I am suspecting the problem is me, but I was wondering if there is anything I can do to make it build? I have two computers on different versions of MacRuby now, where one of them supports a gem i am using (managed to build trunk a while ago), but I can't build trunk on my other machine (or any of them actually), so I can't code on that machine. :) Thanks, Kenny