diff --git a/configure.ac b/configure.ac
index 6b189dbad0..04584998ee 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2876,6 +2876,11 @@ test "x$lv_cv_static_analysis" = xyes && t=1
 AC_DEFINE_UNQUOTED([STATIC_ANALYSIS], [$t],
   [Define to 1 when performing static analysis.])
 
+# Some GNULIB base64 symbols clash with a kerberos library
+AC_DEFINE_UNQUOTED([isbase64],[libvirt_gl_isbase64],[Hack to avoid symbol clash])
+AC_DEFINE_UNQUOTED([base64_encode],[libvirt_gl_base64_encode],[Hack to avoid symbol clash])
+AC_DEFINE_UNQUOTED([base64_encode_alloc],[libvirt_gl_base64_encode_alloc],[Hack to avoid symbol clash])
+
 AC_OUTPUT(Makefile src/Makefile include/Makefile docs/Makefile \
 	  docs/schemas/Makefile \
 	  gnulib/lib/Makefile \