This folder was created in the following way:

Copy from the original star folder, files *.c/*.f/*.h from hds,ems,chr,cnf.
Also include files chr_err, chr_sys, cmp_err, date_err, ems_err, 
cnf_par, dat_par, ems_par, and sae_par. Then create symbolic links to each
of them like this: ln -s cnf_par CNF_PAR.

The following files were modified in 2018 to remove compiler warnings
when compiling on a Fedora 27 machine (return type F77_INTEGER_FUNCTION):
 dauflush.c
 dauloc.c
 dautypes.c
 daushape.c
 dauscatgath.c
 daumove.c
 daucheck.c
 hdstools.c
 rec_wild_file.c
 datfinind.c
 hdsgroup.c

