diff --git a/tools/makedep.c b/tools/makedep.c
index 25277efd7bb..cc988e2aee7 100644
--- a/tools/makedep.c
+++ b/tools/makedep.c
@@ -1359,22 +1359,6 @@ static struct makefile *find_importlib_module( const char *name )
 }
 
 
-/*******************************************************************
- *         has_external_import
- */
-static int has_external_import( const struct makefile *make )
-{
-    unsigned int i;
-
-    for (i = 0; i < make->imports.count; i++)
-    {
-        if (!strncmp( make->imports.str[i], "-l", 2 ))
-            return 1;
-    }
-    return 0;
-}
-
-
 /*******************************************************************
  *         open_include_file
  */
@@ -1452,17 +1436,6 @@ static struct file *open_include_file( const struct makefile *make, struct incl_
         return file;
     }
 
-    if (pFile->type == INCL_SYSTEM && pFile->use_msvcrt &&
-        !make->extlib && !pFile->included_by->is_external)
-    {
-        if (!strcmp( pFile->name, "stdarg.h" )) return NULL;
-        if (!strcmp( pFile->name, "x86intrin.h" )) return NULL;
-        if (has_external_import( make )) return NULL;
-        fprintf( stderr, "%s:%d: error: system header %s cannot be used with msvcrt\n",
-                 pFile->included_by->file->name, pFile->included_line, pFile->name );
-        exit(1);
-    }
-
     if (pFile->type == INCL_SYSTEM) return NULL;  /* ignore system files we cannot find */
 
     /* try in src file directory */