diff --git a/etc/m4/atrip-def.m4 b/etc/m4/atrip-def.m4
new file mode 100644
index 0000000..824cb97
--- /dev/null
+++ b/etc/m4/atrip-def.m4
@@ -0,0 +1,8 @@
+AC_DEFUN([ATRIP_DEF],
+         [AC_ARG_ENABLE([$1],
+                        [AS_HELP_STRING([--$2-$1],
+                                        [$4])],
+                        [AC_DEFINE([$3],
+                                   1,
+                                   [$4])])])
+