case "${host}" in
-hppa*-*-hpux*) HDEFINES=-DHOST_HPPAHPUX ;;
+hppa*-*-hpux*) # HP/UX's ftello64 et.al. declarations are only
+ # visible when _LARGEFILE64_SOURCE is defined.
+ # Without those declarations, real_ftell et.al.
+ # get mis-compiled.
+ HDEFINES="-DHOST_HPPAHPUX -D_LARGEFILE64_SOURCE" ;;
hppa*-*-hiux*) HDEFINES=-DHOST_HPPAHPUX ;;
hppa*-*-mpeix*) HDEFINES=-DHOST_HPPAMPEIX ;;
hppa*-*-bsd*) HDEFINES=-DHOST_HPPABSD ;;