This is rmfit Version 43pr2.

How do I know which tarball to use?

- If you are using linux, and do not wish to perform many installation
steps, and do not require a centralized installation, but have lots of
disk space and are happy installing this in an area where you have
"write" permission, you should use the standalone version
FGST-rmfit_ver33pr7.tar.gz.  This has been tested with a few linux
flavors (SL 4, 5 and Ubuntu).  If you have trouble, use the other
installation.

- If you have a Mac, or if you have linux but you prefer a centralized
distribution, or you already have or wish to download yourself the
necessary supporting software (IDL, GSL, gcc, gfortran), and you are
comfortable making the fortran dlms, you should use the do-it-yourself
version FGST_DIY-rmfit_ver33pr7.tar.gz.

Known Bugs:
***********
1) If you perform a batch spectral fit, then if you perform a batch
spectral fit again without first refitting your selections, the first
time bin will have an erroneous value with a huge time bin.    This is
not something you should do in any case, and affects in no way the
functionality of rmfit when rmfit is correctly used, and you will likely
never come across this, but it is nonetheless a bug that is obvious if
you perform this operation by accident, and so we report it here.  rmfit
does not crash when this happens, and if you just refit your selections,
you can proceed as if nothing had happened.

2) If you encounter as error such as
 % MFIT: Error loading sharable executable.
       Symbol: IDL_Load, File = /home/administrator/rmfit_v432/idl81/bin/bin
       .linux.x86/mfit.so

       libgsl.so.0: wrong ELF class: ELFCLASS64

You can fix this error by
 On 32 bit machines delete  ../rmfit_v432/idl81/bin/bin.linux.x86_64
 On 64 bit machines delete ../rmfit_v432/idl81/bin/bin.linux.x86

and this should eliminate the error.