diff -Naur a/dialects/darwin/libproc/dfile.c b/dialects/darwin/libproc/dfile.c
--- a/dialects/darwin/libproc/dfile.c	2018-02-19 15:04:26.011578124 +0800
+++ b/dialects/darwin/libproc/dfile.c	2018-02-19 15:04:45.006502653 +0800
@@ -43,7 +43,7 @@
 #include "lsof.h"
 
 #if	defined(PROC_FP_GUARDED)
-#extern	struct pff_tab	Pgf_tab[];
+extern	struct pff_tab	Pgf_tab[];
 #endif	/* defined(PROC_FP_GUARDED) */