I briefly noted a small type warning (which was unfortunately truncated by cut-n-paste): `sh cflags libperl.a pp_sys.o` pp_sys.c CCCMD = cc -DPERL_CORE -c -D_ALL_SOURCE -D_ANSI_C_SOURCE -D_POSIX_SOURCE -qma "pp_sys.c", line 4415.14: 1506-068 (W) Operation between types "struct hostent*" and "in. But the real problem was with the symbols for .Perl_deb. On this older version of AIX and older version of cc I now see: LD_RUN_PATH="" ld -o ../../lib/auto/re/re.so -bhalt:4 -bM:SRE -bI:../../perl.ex ld: 0711-317 ERROR: Undefined symbol: .Perl_deb ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information. make: 1254-004 The error code from the last command is 8. Stop. make: 1254-004 The error code from the last command is 2. So yes Jarkko, apparently I was being too restricive in the ccversion comparison I did. A fix will have to await some time when I can experiment with an ext/re/hints/aix.pl implementation, but I thougt that I'd just send this note out before I head out the door for the weekend. Peter Prymmer