Confused about enabling parallel ghc

[Simon Marlow]

> I installed ghc 4.08.2 binaries for sparc solaris (and those for intel
> linux, too), then tried compiling a sample program (the fibonacci one
> in the user guide) with ghc -parallel.  The compiler complained:
> 
>     Could not find interface file for `Prelude'
>     in the directories ./*.hi
>                        /u/trebla/lib/ghc-4.08.2/imports/lang/*.mp_hi
>                        
> /u/trebla/lib/ghc-4.08.2/imports/concurrent/*.mp_hi
>                        /u/trebla/lib/ghc-4.08.2/imports/lang/*.mp_hi
>                        
> /u/trebla/lib/ghc-4.08.2/imports/concurrent/*.mp_hi
>                        /u/trebla/lib/ghc-4.08.2/imports/std/*.mp_hi
> 
> (and similarly for Parallel.)
> 
> Does it mean I must build ghc myself from source?
> 
> The user guide promises a lot of binary bundles such as par.  Ever
> since 4.0x, the ghc download page ceases to mention them.  Where
> are they?

This just means that Parallel support isn't included in the binary
bundle you have.  In fact, parallel support is developed and distributed
separately.  Contact the GPH (Glasgow Parallel Haskell) folks for more
information:

	http://www.cee.hw.ac.uk/~dsg/gph/

Cheers,
	Simon