diff --git a/fns.h b/fns.h
index e8dec18b83..bfe8c47616 100644
--- a/fns.h
+++ b/fns.h
@@ -1,6 +1,7 @@
 // <signal.h>
-//void sigaction();
-//void sigemptyset();
+/*
+void sigaction();
+void sigemptyset();
 
 // <string.h>
 void* memcpy();
@@ -8,3 +9,4 @@ void* memmove();
 void* memset();
 unsigned long strlen(const char*);
 char* strerror(int);
+*/
diff --git a/vlib/compiler/cheaders.v b/vlib/compiler/cheaders.v
index df326d6fe5..8172c77dd6 100644
--- a/vlib/compiler/cheaders.v
+++ b/vlib/compiler/cheaders.v
@@ -6,13 +6,18 @@ CommonCHeaders = '
 
 #include <stdio.h>  // TODO remove all these includes, define all function signatures and types manually
 #include <stdlib.h>
-#include "fns.h"
+
+//#include "fns.h"
+#include <signal.h>
 #include <stdarg.h> // for va_list
 #include <inttypes.h>  // int64_t etc
+#include <string.h> // memcpy
 
 #ifndef _WIN32
 #include <ctype.h>
+#include <locale.h> // tolower
 #include <sys/time.h>
+#include <unistd.h> // sleep
 #else
 #if defined(__MSVCRT_VERSION__) && __MSVCRT_VERSION__ < __MSVCR90_DLL
 #error Please upgrade your MinGW distribution to use msvcr90.dll or later.