diff -up src/sage/groups/perm_gps/permgroup.py.orig src/sage/groups/perm_gps/permgroup.py
--- src/sage/groups/perm_gps/permgroup.py.orig	2014-08-12 14:19:36.779976673 -0300
+++ src/sage/groups/perm_gps/permgroup.py	2014-08-12 14:19:44.435976966 -0300
@@ -180,8 +180,7 @@ def hap_decorator(f):
     """
     @wraps(f)
     def wrapped(self, n, p=0):
-        if not is_package_installed('gap_packages'):
-            raise RuntimeError("You must install the optional gap_packages package.")
+        raise RuntimeError("gap-hap package not available.")
         load_hap()
         from sage.rings.arith import is_prime
         if not (p == 0 or is_prime(p)):
@@ -3934,8 +3933,7 @@ class PermutationGroup_generic(group.Gro
 
         - David Joyner and Graham Ellis
         """
-        if not is_package_installed('gap_packages'):
-            raise RuntimeError("You must install the optional gap_packages package.")
+        raise RuntimeError("gap-hap package not available.")
         load_hap()
         from sage.rings.arith import is_prime
         if not (p == 0 or is_prime(p)):