cc -g -Aa utility.c reg_prgm.c -D_INCLUDE_HPUX_SOURCE -o a.out -lsicl -lm

# use the following line if you have a HPE1410 voltmeter at logical address 48
#   or an HP3478 GPIB voltmeter at address 23
#cc -g -Aa utility.c reg_prgm.c -D_INCLUDE_HPUX_SOURCE -DUSE_VM -o a.out -lsicl -lm