[wxhaskell-users] wxHaskell package registration

[Keith W. <Kei...@cl...>]

Hi... recently I attempted to install wxHaskell on a system with
multiple versions of GHC installed.  I did

./configure --prefix=/usr/local/foo --with-opengl
make
su
make install

The "make" phase used the default "ghc" in my path.

The "make install" phase used the default "ghc-pkg" in my path.

However, my paths as ordinary user and as root are _different_, and so
these were different: /usr/local/bin/ghc ->
/usr/local/bin/ghc-6.3.20041124 versus /usr/bin/ghc-pkg ->
/usr/bin/ghc-pkg-6.2.2.

This had the obvious consequence of registering a wxHaskell built for 
one ghc, ghc-6.3.20041124, with the wrong ghc, ghc-6.2.2.

AFAICS, a straightforward solution is for the configure script to
determine the absolute paths of both ghc and ghc-pkg, and for the rest
of the build system to use those absolute paths, rather than relying
on the executable search path to find them.  This still breaks if
"ghc-pkg" does not correspond to "ghc" even with the same path; but
this is a much less likely scenario (and the --hc=foo, --hcpkg=foo,
switches are still there to address it).

Thanks for a great piece of software; I'm enjoying using it!

--KW 8-)

-- 
Keith Wansbrough <kw...@cl...>
http://www.cl.cam.ac.uk/users/kw217/
University of Cambridge Computer Laboratory.