diff --git a/aclocal.m4 b/aclocal.m4
index 5d2fdbe..15640db 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1139,6 +1139,7 @@
 m4_include([m4/ax_cflags_warn_all.m4])
 m4_include([m4/ax_check_compile_flag.m4])
 m4_include([m4/ax_compare_version.m4])
+m4_include([m4/ax_compiler_vendor.m4])
 m4_include([m4/ax_cxx_bool.m4])
 m4_include([m4/ax_cxx_namespace_std.m4])
 m4_include([m4/ax_cxx_namespaces.m4])