Akim Demaille writes: > +AH_TEMPLATE([_HPUX_SOURCE], > + [FIXME: what's the documentation?])dnl Well, as Paul Eggert said, it is preferrable to try to append "-Ae" to $CC (and $CPP) instead of defining _HPUX_SOURCE. "cc -Ae" gives you "long long" support, which _HPUX_SOURCE doesn't. Bruno