Because hexcalc 1.11 doesn't support the keypad I created a patch to include keypad support. It works both with Num Lock enabled and disabled.
Created attachment 102832 [details, diff] Patch to add keypad support Patch is against hexcalc 1.11, should also work against 1.11-r1 as that patch patches something completely different.
Created attachment 102833 [details] ebuild to apply patch to hexdump-1.11-r1 Indeed, the patch works flawlessly against 1.11-r1
+*hexcalc-1.11-r2 (22 Jun 2010) + + 22 Jun 2010; Justin Lecher <jlec@gentoo.org> -hexcalc-1.11-r1.ebuild, + +hexcalc-1.11-r2.ebuild, +files/hexcalc-keypad.diff: + Including patch for Keypad, #156390; respecting users choices of CC anf + FLAGS +