Linking and Including nonstandard paths

[Chris McCraw]

Hi!

We're fairly happy users of ghc in my department.  We use it widely
for instruction and to some degree for research.  I'm the fellow tasked
with maintaining the local installation, and I have a couple of simple
and seemingly related problems that I'm sure have easy solutions, though
I haven't been able to find them.

1) I'd like to embed an additional library search directory in ghc so
that it does the equivalent of -L/path/to/extra/dir every time it's
used to link something.  Unfortunately, our libgmp resides in a nonstandard
directory and so *every time* someone wants to compile they must
	ghc -L/lusr/gnu/lib ...
to find -lgmp.  I promise, we have thought about moving libgmp into the
default search path, and setting $LD_LIBRARY_PATH, but those break a
lot of other stuff in our setup, and are really not practical in our
environment.
We build all of our utilities from source (including ghc) so I would be
happy & able to tweak some setting during configure or make or even hack
the source--but I can't figure out where to change it.  I figured it'd be
in configure.mk(.in) but adding "-R /lusr/gnu/lib" to the LD command
line did not do the trick in generating a ghc binary that calls ld/collect2
in the same way.


2) When building something, I often need to add an include directory.
As an example, GSLHaskell:

% runhaskell -I/lusr/gnu/include Setup.hs build
[...]
[16 of 17] Compiling GSL.Plot         ( GSL/Plot.hs, dist/build/GSL/Plot.p_o )
[17 of 17] Compiling GSL              ( GSL.hs, dist/build/GSL.p_o )

GSL/gslaux.c:2:26:  gsl/gsl_blas.h: No such file or directory

GSL/gslaux.c:3:28:  gsl/gsl_linalg.h: No such file or directory

gsl/gsl_blas.h and friends are indeed in /lusr/gnu/include and I'd
like to do the equivalent of adding a $CFLAGS of -I/lusr/gnu/include to
the build (or to every build--it'd be grand if that was included by
default, though not as necessary as item #1 above) but can't figure
out how.

I'm working with ghc-6.6 on ubuntu linux, in case that matters.  I'm
not sure what else is relevant, but am happy to provide details as needed.

Help?

Thanks in advance!