gmake -f unix/Makefile hpux CC=cc CXX=aCC prefix=/usr/local
gmake -f unix/Makefile install prefix=/usr/local
gmake -f unix/Makefile clean
gmake -f unix/Makefile hpux CC=gcc CXX=g++ prefix=/usr/local BINDIR=/usr/local/bin/pa20_64
gmake -f unix/Makefile install prefix=/usr/local BINDIR=/usr/local/bin/pa20_64