diff --git a/lib/util/parseln.rs b/lib/util/parseln.rs
index 9737735111bc4f3704f96c814de00347b18466f4..ffcc7d901a0184ed1b2e8f405c7a44be802256bc 100644
--- a/lib/util/parseln.rs
+++ b/lib/util/parseln.rs
@@ -32,17 +32,7 @@ pub struct _IO_wide_data {
     _unused: [u8; 0],
 }
 
-extern "C" {
-    fn strchr()
-    fn __ctype_b_loc()
-    fn realloc()
-    fn free()
-    fn memcpy()
-    fn sudo_debug_printf2_v1()
-}
 
-pub type __ssize_t = libc::c_long;
-pub type ssize_t = __ssize_t;
 pub type __SIZE_TYPE__ = libc::c_ulong;
 pub type size_t = __SIZE_TYPE__;
 pub type FILE = _IO_FILE;