I used f2c and fort95 (f2c converts from FORTRAN to C code, and fort95 wraps this so it can be called the same way as the GCC FORTRAN compiler, g77), and I can post the recipes if anyone fancies having a go themselves. The Debian builds are a real PITA due to slice, which is a perl utility which requires the addition of some binary perl libraries to the scratchbox environment (Do a search for "Debian slice" and grab the .dsc, .diff, .tar.gz and look at the deps).
export SBOX_REDIRECT_IGNORE=/usr/bin/perl ; export PATH=/usr/bin:$PATH