Originally Neil Mitchell's patch, minor conflict fixed by me.

before:

  bindir  = $prefix\$pkgid
  datadir = $prefix

now:

  bindir  = $prefix\Haskell\bin
  datadir = $prefix\Haskell

datasubdir is still $pkgid, so data files for an exectuable will be
installed in $prefix\Haskell\$pkgid.

the idea is that all executables are installed in the same directory
by default, so setting PATH is easier.  Also, data files belonging to
Haskell programs are grouped together under $prefix\Haskell.

Each package component must now contain at least one letter, a weaker 
requirement than always beginning with a letter.

Avoids ambiguities with package identifiers like "foo-1" (the 1 is the
version number). 

This brings it in sync with the package.conf.

Make -o use the filename as GHC will, i.e. with .exe on the end for Windows. This fixes a GHC 6.4.2 bug with relinking every time.

We'll see if anyone complains.

When using GHC's --split-objs we end up with lots of files to link.
This can mean overflowing the maximum length of the command line
when invoking ar or ld. On windows the maximum length is 32k. On
other systems it's not a great deal more. GHC currently deals with
this problem by using xargs. This patch does more or less the same.

This needs testing.

Distribution.Compat.Map taken from Haddock.

This shouldn't make any difference to current GHC's, but will be
required by the new GHC package code.

When we get confirmation from GHC devs that it's the right
thing to do then we can add it in.

For additional information see these mail threads:

http://www.haskell.org//pipermail/libraries/2006-July/005522.html
http://urchin.earth.li/pipermail/debian-haskell/2006-July/000220.html

This patch undid the previous patch, "merge from base".  I asked Sven
to revert it, but didn't get an answer.
  
See GHC bug #473.

The extra-libraries must be passed as -L-l${lib} or linking the C prog
that hsc2hs generates may fail if any symbols are referenced.
Also can't use cppOptions function since hsc2hs doesn't support -U.
Need to do -U flags in ccOptions seperately.