diff --git a/aclocal.m4 b/aclocal.m4
index 54412b6..2511e34 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1321,6 +1321,7 @@
]) # _AM_PROG_TAR
m4_include([m4/ac_func_fseeko.m4])
+m4_include([m4/ax_append_flag.m4])
m4_include([m4/ax_c___attribute__.m4])
m4_include([m4/ax_cflags_warn_all.m4])
m4_include([m4/ax_check_compile_flag.m4])
@@ -1336,6 +1337,7 @@
m4_include([m4/ax_prefix_config_h.m4])
m4_include([m4/ax_prog_perl_version.m4])
m4_include([m4/ax_pthread.m4])
+m4_include([m4/ax_require_defined.m4])
m4_include([m4/cxx_have_std_libs.m4])
m4_include([m4/framework.m4])
m4_include([m4/ld-version-script.m4])