The best compile options for HPUX PGP21 are:

hpux:
        $(MAKE) all CPP=/usr/lib/cpp \
        CFLAGS="-Aa +O3 +Obb5000 -D_INCLUDE_POSIX_SOURCE \
        -D_INCLUDE_HPUX_SOURCE -D_INCLUDE_XOPEN_SOURCE -DHIGHFIRST -DUNIX \
        -DMPORTABLE -DPORTABLE -DUSE_SELECT -DIDEA32 -DMERRIT"

			-David