diff --git a/src/proto/if_perlsfio.pro b/src/proto/if_perlsfio.pro
new file mode 100644
index 0000000..bb90468
--- /dev/null
+++ b/src/proto/if_perlsfio.pro
@@ -0,0 +1,3 @@
+/* if_perlsfio.c */
+int *sfdcnewvim __ARGS((void));
+/* vim: set ft=c : */