I installed ghc (x86) from the bindist tarball like so: $ wget http://www.haskell.org/ghc/dist/7.0.2/ghc-7.0.2-i386-apple-darwin.tar.bz2 $ tar -xjf ghc-7.0.2-i386-apple-darwin.tar.bz2 $ cd ghc-7.0.2-i386-apple-darwin $ ./configure --prefix=$HOME/local $ make install $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.0.2 GHCi works fine: $ ghc -e 3+4 7 However, if I want to compile a test file I get a weird dtrace error. $ cat test.hs main = print 42 $ ghc --make test.hs [1 of 1] Compiling Main ( test.hs, test.o ) Linking test ... error: Could not compile reconstructed dtrace script: Unhandled typedefs encoding version v2 provider HaskellEvent { probe thread_wakeup(EventCapNo,EventThreadID,EventCapNo); probe thread__runnable(EventCapNo,EventThreadID); probe migrate__thread(EventCapNo,EventThreadID,EventCapNo); probe create__thread(EventCapNo,EventThreadID); probe gc__work(EventCapNo); probe gc(int, double, long,...)(EventCapNo); probe gc__done(EventCapNo); probe gc__start(EventCapNo); probe gc__end(EventCapNo); probe stop__thread(EventCapNo,EventThreadID,EventThreadStatus); probe run__thread(EventCapNo,EventThreadID); probe startup(EventCapNo); probe user__msg(EventCapNo,char *); }; #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent provider #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent module #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent function #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent name #pragma D attributes PRIVATE/PRIVATE/UNKNOWN provider HaskellEvent args ld: error creating dtrace DOF section collect2: ld returned 1 exit status $ uname -mrsv Darwin 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 Any idea what's going on there? / Thomas -- Push the envelope. Watch it bend.