The library of routines providing packaged access to SuperCOSMOS mapping data from C can be obtained by ftp from ROE.
The unpacked tar file contains bigio.c, which is the source of the library, plus some include files and a selection of example C programs.
The library can be compiled by
cc -c -o bigio.o bigio.c
An example program can then be built using
cc -o listmap listmap.c bigio.o