diff --git a/autogen.sh b/autogen.sh
index 092cfa8..5194515 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 # Run this to generate all the initial makefiles, etc.
 
-ACLOCAL_FLAGS="-I m4"
+ACLOCAL_FLAGS="-I m4 ${ACLOCAL_FLAGS}"
 
 touch ChangeLog