Disable ppc64 target for now; broken since 4.6.4

gambit-c.spec

@@ -1,5 +1,9 @@
 %global dirname gambc-v4_6_5-devel
 
+# ppc64 support is broken at the moment.
+# use with --with ppc64 to test
+%bcond_with ppc64
+
 Name:           gambit-c
 Version:        4.6.5
 Release:        1%{?dist}
@@ -12,6 +16,11 @@ Source0:        http://www.iro.umontreal.ca/~gambit/download/gambit/v4.6/source/
 Source1:        gambit-init.el
 Patch0:         gambc-v4_2_8-modtime.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=808285
+%if ! %{with ppc64}
+ExcludeArch:	ppc64
+%endif
+
 BuildRequires:  emacs
 Requires:       gcc
 
@@ -167,6 +176,7 @@ fi
 * Thu Mar 29 2012 Michel Salim <salimma@fedoraproject.org> - 4.6.5-1
 - Update to 4.6.5
 - Drop termite subpackages, they have been disabled for many releases
+- Disable ppc64 target for now; broken since 4.6.4
 
 * Wed Feb 15 2012 Michel Salim <salimma@fedoraproject.org> - 4.6.4-1
 - Update to 4.6.4