diff --git a/.gnulib b/.gnulib
index 106a3866d01f9dd57ab4f10dbeb0d5a8db73a9f7..875ec93e1501d2d2a8bab1b64fa66b8ceb51dc67 160000
--- a/.gnulib
+++ b/.gnulib
@@ -1 +1 @@
-Subproject commit 106a3866d01f9dd57ab4f10dbeb0d5a8db73a9f7
+Subproject commit 875ec93e1501d2d2a8bab1b64fa66b8ceb51dc67
diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
index 8aebdb05419437389b94a7de4a96e1555cadb0a4..3dd0665c3d35e5556e5504f11fea62a261fc978f 100644
--- a/m4/virt-compile-warnings.m4
+++ b/m4/virt-compile-warnings.m4
@@ -59,6 +59,8 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
     dontwarn="$dontwarn -Waggregate-return"
     # gcc 4.4.6 complains this is C++ only; gcc 4.7.0 implies this from -Wall
     dontwarn="$dontwarn -Wenum-compare"
+    # gcc 5.1 -Wformat-signedness mishandles enums, not ready for prime time
+    dontwarn="$dontwarn -Wformat-signedness"
 
     # gcc 4.2 treats attribute(format) as an implicit attribute(nonnull),
     # which triggers spurious warnings for our usage