diff --git a/.gitattributes b/.gitattributes
index 9fcdbed783b425bad229893207c15e9b557d1374..85d04707aee9e5ece1fed9bd3d04e7337e26e6c1 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -43,6 +43,7 @@ testfont binary
 /src/modules/Mysql/precompiled_mysql.h foreign_ident
 /src/modules/Mysql/result.c foreign_ident
 /src/modules/Pipe/pipe.c foreign_ident
+/src/modules/Regexp/acconfig.h foreign_ident
 /src/modules/Ssleay/ssleay.c foreign_ident
 /src/modules/_Crypto/cbc.c foreign_ident
 /src/modules/_Crypto/crypto.c foreign_ident
diff --git a/src/modules/Regexp/acconfig.h b/src/modules/Regexp/acconfig.h
new file mode 100644
index 0000000000000000000000000000000000000000..ca161b94a5d0559c534c089d0b4ef611667e5c78
--- /dev/null
+++ b/src/modules/Regexp/acconfig.h
@@ -0,0 +1,15 @@
+/*
+ * $Id: acconfig.h,v 1.1 1997/02/11 18:46:57 grubba Exp $
+ */
+
+#ifndef PIKE_MODULES_REGEXP_H
+#define PIKE_MODULES_REGEXP_H
+
+@TOP@
+
+/* Define if you want to use the systems regexp's */
+#undef USE_SYSTEM_REGEXP
+
+@BOTTOM@
+
+#endif /* PIKE_MODULES_REGEXP_H */