This directory contains software to compute HF-EOP variations. It is written in fortran and should work with any modern gfortran compiler. To compile the software just type 'make'. The software assumes that there are various hfeop models in the directory ../models. If you have any questions about this software please feel free to contact me. John Gipson IVS Analysis Coordinator Chair, IERS Working Group on diurnal and semi-diurnal EOP variation NASA's GSFC 301-614-6876 john.m.gipson@nasa.gov ---------BUG FIX------ 2019-Oct-09 Michael Gerstl discovered two minor bugs in hfeop_xyu_mod.f. The maximum difference in PM is about 0.30 uas, and in UT1 about 0.02 us, both of which are negligble. 1.) I have these bugs and renamed the original file to hfeop_xyu_mod.f.bad. 2.) I have renamed all of the original *.out to *.out.bad. 3.) I have remade the program test_hf_eop, and regenerated all of the *.out.