I'm trying to compile llvm-gcc as:
I have following file to avoid not found error:

modena@makoto 22:27:56/100830(~)% ls -la  /CoreOS/Standard/Standard.make 
-rw-r--r--  1 makoto  wheel  0 Aug 13 23:42 /CoreOS/Standard/Standard.make

But getting:

...
dsymutil is not available
configure: error: You must specify valid path to your LLVM tree with --enable-llvm=DIR
gmake[2]: *** [configure-stage1-gcc] Error 1

In log, I saw following lines.

=> Checking for portability problems in extracted files
(cd /export/pkgsrc/wip/llvm-gcc/work/obj;  \
../llvm-gcc-4.2-2.7.source/configure  \
--program-prefix=llvm-  \
--enable-llvm=/export/pkgsrc/wip/llvm-gcc/work/llvm  \
--prefix=/usr/pkg  \
--enable-optimized \
--enable-assertions  )
creating cache ./config.cache

and work/llvm is there, just open up, not llvm built yet.