ghc-asm problem in OS-X 2010.2.0.0 when compiling happstack-util

[Doug Burke]

I installed the 2010.2.0.0 OS-X package today which was very easy. So far so good except for the following problem when trying to install happstack-util

% cabal install happstack-util
... lots of stuff deleted ...

src/Happstack/Util/AutoBuild.hs:90:4:
    Warning: A do-notation statement discarded a result of type ExitCode.
             Suppress this warning by saying "_ <- waitForProcess ph",
             or by using the flag -fno-warn-unused-do-bind
[13 of 19] Compiling Happstack.Crypto.MD5 ( src/Happstack/Crypto/MD5.hs, dist/build/Happstack/Crypto/MD5.o )
ghc: could not execute: /Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/ghc-asm
cabal: Error: some packages failed to install:
happstack-util-0.5.0.2 failed during the building phase. The exception was:
ExitFailure 1

The ghc-asm executable exists - 

% ls -l /Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/ghc-asm
-rwxrwxr-x  1 root  admin  74344 Jun 11 11:42 /Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/ghc-asm

- but the problem is that it uses an invalid perl location - namely /opt/local/bin as shown below

% head -1 /Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/ghc-asm
#!/opt/local/bin/perl

If I manually change it to the location of perl

% which perl
/usr/bin/perl
% head -1 /Library/Frameworks/GHC.framework/Versions/612/usr/lib/ghc-6.12.3/ghc-asm
#!/usr/bin/perl

then 'cabal install happstack-util' works.



Let me know if you need any more info,
Doug