diff --git a/misc/cgo/stdio/file.go b/misc/cgo/stdio/file.go
index ab1e884..6e7d479 100644
--- a/misc/cgo/stdio/file.go
+++ b/misc/cgo/stdio/file.go
@@ -28,7 +28,7 @@
 
 // Test reference to library symbol.
 // Stdout and stderr are too special to be a reliable test.
-var myerr = C.sys_errlist
+//var  = C.environ
 
 func (f *File) WriteString(s string) {
 	p := C.CString(s)