Here are the basic steps for use of ALLSPD-3D under Linux including
the details on creating the substutute Cray library:

ALLSPD-3D & Linux
-----------------

Some users have asked about running ALLSPD-3D on PCs.  The ALLSPD-3D is
not ported to any MS-DOS or MS-Windows environment and there are no
plans to do so.  However, ALLSPD-3D has been compiled on PCs running
the Linux operating system.  We have not verified the usefulness of
such a configuration because of the availability of hardware, installed
software, and time.  One could assume that the changes needed to run
under Linux on a PC would apply to any platform running Linux.

Here are the modifications needed to compile & run ALLSPD-3D under the
Linux operating system.  There are three main tasks:

1. edit allspd-3D-Rel-1.0/SubCrayLib/Makefile to create a target
for linux, compile, & install:
  o in the Makefile, copy the g77-rs6k target and change each 'g77-rs6k'
    to 'linux' to make a 'linux' target
  o create the directory allspd-3D-Rel-1.0/CFD/lib/linux
  o cd allspd-3D-Rel-1.0/SubCrayLib/; make veryclean linux install

2. edit allspd-3D-Rel-1.0/CFD/src/Makefile to create a target for linux, 
compile, & install
  o in the Makefile, copy the g77-rs6k target and change each 'g77-rs6k'
    to 'linux' to make a 'linux' target
  o cd allspd-3D-Rel-1.0/CFD/src/; make veryclean linux
  o install the resulting binary

3. re-generate any Fortran UNFORMATTED input files (like uvwt.dat)
under linux and run the code
  o the uvwt.dat file in allspd-3D-Rel-1.0/Sample-Tests/Swirl-can/ and
    allspd-3D-Rel-1.0/Sample-Tests/Transition-duct/ were generated on
    a UNIX workstation which is "big-endian"; PCs running Linux are
    "little-endian".  Therefore, the PC can not read the uvwt.dat files
    since they have the bits in a different order.  (If you want to 
    re-run the Sample-Tests under Linux, I can give you the source code
    for generating the uvwt.dat files.)
  o run the code

I believe that is all you need to do to install the code under Linux.

NOTES:
o One user has reported problems with 'make veryclean' under Slackware 3.1;
  specifically, an error occurs during 'mkdir Pre-processed/' which causes
  it to bomb out.  Run 'rm -rf allspd3d pregrid *.o Pre-processed; 
  mkdir Pre-processed; mkdir Pre-processed/Include' instead.

o If compiling for Linux on a DEC Alpha or PowerPC architecture, pay 
  attention to whether your system is big-endian or little-endian.  You
  may not need to re-generate the Fortran UNFORMATTED input files 
  (like uvwt.dat).

o For more information on Linux, check out the Linux Home Page at:

    http://www.linux.org/

o For ideas on running computationally intensive jobs in parallel on a 
  cluster of PCs with Linux, check out the Beowulf Project at:

    http://cesdis.gsfc.nasa.gov/linux-web/beowulf/beowulf.html