This document contains steps to build LAM MPI with Absoft Fortran 90 compiler (and link to Absoft IMSL libraries) for Mac OS X.

Set these two environment variables (for tcsh shell - default shell in Mac OS X)
  setenv CFLAGS -fno-common
  setenv FFLAGS "-YEXT_NAMES=LCS -YEXT_SFX=_"

Then configure LAM MPI with the following,
  ./configure --with-fc=f90 --without-romio --without-mpi2cpp --prefix=/usr/local/lam

In this case, LAM has been configured to install at /usr/local/lam. In addition, one has to make sure that f90 is in the current path.

When the configure step is completed, do make
  make

This may take a few minutes. These are the warning messages I have collected when I built my LAM MPI,
   ranlib: file: .libs/liblametc.a(ieee.o) has no symbols
   ranlib: file: .libs/liblam.a(ieee.o) has no symbols
   mpitr_data.c:78: warning: use of `long double' type; its size may change in a future release
   mpitr_data.c:78: warning: (Long double usage is reported only once for each file.
   mpitr_data.c:78: warning: To disable this warning, use -Wno-long-double.).

Then, do make install to install the binary.
  make install

When you have completed the above steps, you need to add /usr/local/lam/bin to your path.  Within /usr/local/lam/bin, you may be surprised that you only find mpif77. This is just a symbolic link and it has been configure with f90 NOT f77. If you desired, you could create another symbolic link with name mpif90.

The following is an example Makefile,

FC = mpif77
FOPTS= -s -N11 -O2 -YEXT_NAMES=LCS -YEXT_SFX=_ -YDEALLOC=ALL -ffree -p /Applications/Absoft/imsl_modules
LIB=-L/usr/local/lam/lib -llam -llamf77mpi -lmpi -lpmpi -L/Applications/Absoft/lib -limslf90 -limsl -limslblas
OUT = ga-p
EXT = f90
SRC = ga-p

 $(OUT) : $(SRC).$(EXT)
        $(FC) $(FOPTS) -o $(OUT) $(SRC).$(EXT) $(LIB)

I have the binary that I have built here (lam.tar.gz). All you have to do it get a copy of it. Gunzip and Untar at /usr/local with gunzip < lam.tar.gz | tar xvf -.
Then, add /usr/local/lam/bin to your path. All done!

Hopefully, this would be helpful to someone else.

Absoft would like to thank Sin Ming Loo of The University of Alabama in Huntsville for this contribution.