[Haskell-cafe] Unable to profile program using Data.ByteString.Lazy

[Lyle Kopnicky]

Hi folks,

I wrote a program that uses some of the Data.ByteString libraries. I'm 
using GHC 6.4.1 and FPS 0.7.

The program compiles and works just fine. But when I try to profile it, 
by compiling with -prof, I get:

    Failed to load interface for `Data.ByteString.Lazy':
        Could not find module `Data.ByteString.Lazy':
          locations searched:
            Data/ByteString/Lazy.hi
            Data/ByteString/Lazy.hi-boot
            /f/g/lib/fps-0.7/Data/ByteString/Lazy.p_hi

Why can it find the module when it's compiling without -prof, but not 
when it's compiling with it? I would really like to get profiling to work.

Thanks,
Lyle