diff --git a/m4/afs.m4 b/m4/afs.m4
new file mode 100644
index 000000000..5153f90e6
--- /dev/null
+++ b/m4/afs.m4
@@ -0,0 +1,7 @@
+#serial 1
+
+AC_DEFUN(jm_AFS,
+  AC_CHECKING(for AFS)
+  test -d /afs \
+    && AC_DEFINE(AFS, 1, [Define if you have the Andrew File System.])
+)