diff --git a/rubygem-rkerberos.spec b/rubygem-rkerberos.spec
index e64980b..bece613 100644
--- a/rubygem-rkerberos.spec
+++ b/rubygem-rkerberos.spec
@@ -14,7 +14,7 @@ Summary: A Ruby interface for the the Kerberos library
 Name: %{?scl_prefix}rubygem-%{gem_name}
 
 Version: 0.1.5
-Release: 1%{?dist}
+Release: 2%{?dist}
 Group: Development/Languages
 License: Artistic 2.0
 URL: http://github.com/domcleal/rkerberos
@@ -62,6 +62,17 @@ gem unpack %{SOURCE0}
 
 %setup -q -D -T -n  %{gem_name}-%{version}
 
+# Workaround for the following error on ppc{,64)
+#In file included from /usr/include/gssrpc/rpc.h:46:0,
+#                 from /usr/include/kadm5/admin.h:45,
+#                 from ./rkerberos.h:9,
+#                 from ccache.c:1:
+#/usr/include/gssrpc/xdr.h:123:38: error: unknown type name 'caddr_t'
+#   bool_t (*x_getbytes)(struct XDR *, caddr_t, u_int);
+sed -i \
+	-e '\@CFLAGS@s|-pedantic|\0 -D_DEFAULT_SOURCE|' \
+	ext/rkerberos/extconf.rb
+
 %{?scl:scl enable %{scl} "}
 gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
 %{?scl:"}
@@ -130,6 +141,10 @@ popd
 
 
 %changelog
+* Thu Jan 12 2017 Mamoru TASAKA <mtasaka@fedoraproject.org> - 0.1.5-2
+- F-26: rebuild for ruby24
+- add -D_DEFAULT_SOURCE for now
+
 * Mon Oct 24 2016 Miroslav Suchý <msuchy@redhat.com> 0.1.5-1
 - rebase to 0.1.5