diff --git a/Cargo.toml b/Cargo.toml
index cb131f5..7d7466e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,6 @@ members = [
 ]
 
 [dependencies]
-libc = { version = "0.2" }
 num-traits = { version = "0.2.6" }
 bstr = { version = "0.2", features = ["std"], default_features = false }
 
diff --git a/src/ffi/glue/glue.c b/src/ffi/glue/glue.c
index fd74614..65249d6 100644
--- a/src/ffi/glue/glue.c
+++ b/src/ffi/glue/glue.c
@@ -200,7 +200,7 @@ int main(int argc, const char **argv) {
 
   const rs_item glue_entries[] = {
       RS_COMMENT("this file was generated by glue.c; do not modify it by hand"),
-      RS_RAW("use libc::*;\n"),
+      RS_RAW("use std::os::raw::*;\n"),
 
       // == luaconf.h ==========================================================
 
@@ -212,7 +212,7 @@ int main(int argc, const char **argv) {
       RS_INT("LUA_EXTRASPACE", LUA_EXTRASPACE),
       RS_INT("LUA_IDSIZE", LUA_IDSIZE),
       // RS_INT("LUAI_MAXSHORTLEN", LUAI_MAXSHORTLEN),
-      RS_TYPE("LUA_KCONTEXT", xstr(LUA_KCONTEXT)),
+      // RS_TYPE("LUA_KCONTEXT", xstr(LUA_KCONTEXT)),
       RS_INT("LUAI_BITSINT", LUAI_BITSINT),
       // LUA_INT32? LUAI_UMEM? LUAI_MEM?
       RS_INT("LUAI_MAXSTACK", LUAI_MAXSTACK),
diff --git a/src/ffi/lauxlib.rs b/src/ffi/lauxlib.rs
index 258b741..5a9c5c8 100644
--- a/src/ffi/lauxlib.rs
+++ b/src/ffi/lauxlib.rs
@@ -22,7 +22,7 @@
 
 //! Contains definitions from `lauxlib.h`.
 
-use libc::{c_char, c_int, c_long, c_void, size_t};
+use std::os::raw::{c_char, c_int, c_long, c_void};
 use std::ptr;
 
 use super::lua::{self, lua_CFunction, lua_Integer, lua_Number, lua_State};
@@ -45,23 +45,23 @@ pub unsafe fn luaL_checkversion(L: *mut lua_State) {
     luaL_checkversion_(
         L,
         lua::LUA_VERSION_NUM as lua_Number,
-        LUAL_NUMSIZES as size_t,
+        LUAL_NUMSIZES as usize,
     )
 }
 
 extern "C" {
-    pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: size_t);
+    pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: usize);
 
     pub fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
     pub fn luaL_callmeta(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
-    pub fn luaL_tolstring(L: *mut lua_State, idx: c_int, len: *mut size_t) -> *const c_char;
+    pub fn luaL_tolstring(L: *mut lua_State, idx: c_int, len: *mut usize) -> *const c_char;
     pub fn luaL_argerror(L: *mut lua_State, arg: c_int, l: *const c_char) -> c_int;
-    pub fn luaL_checklstring(L: *mut lua_State, arg: c_int, l: *mut size_t) -> *const c_char;
+    pub fn luaL_checklstring(L: *mut lua_State, arg: c_int, l: *mut usize) -> *const c_char;
     pub fn luaL_optlstring(
         L: *mut lua_State,
         arg: c_int,
         def: *const c_char,
-        l: *mut size_t,
+        l: *mut usize,
     ) -> *const c_char;
     pub fn luaL_checknumber(L: *mut lua_State, arg: c_int) -> lua_Number;
     pub fn luaL_optnumber(L: *mut lua_State, arg: c_int, def: lua_Number) -> lua_Number;
@@ -113,7 +113,7 @@ extern "C" {
     pub fn luaL_loadbufferx(
         L: *mut lua_State,
         buff: *const c_char,
-        sz: size_t,
+        sz: usize,
         name: *const c_char,
         mode: *const c_char,
     ) -> c_int;
@@ -242,7 +242,7 @@ pub unsafe fn luaL_getmetatable(L: *mut lua_State, n: *const c_char) {
 pub unsafe fn luaL_loadbuffer(
     L: *mut lua_State,
     s: *const c_char,
-    sz: size_t,
+    sz: usize,
     n: *const c_char,
 ) -> c_int {
     luaL_loadbufferx(L, s, sz, n, ptr::null())
@@ -251,8 +251,8 @@ pub unsafe fn luaL_loadbuffer(
 #[repr(C)]
 pub struct luaL_Buffer {
     pub b: *mut c_char,
-    pub size: size_t,
-    pub n: size_t,
+    pub size: usize,
+    pub n: usize,
     pub L: *mut lua_State,
     pub initb: [c_char; LUAL_BUFFERSIZE as usize],
 }
@@ -271,29 +271,23 @@ pub unsafe fn luaL_addchar(B: *mut luaL_Buffer, c: c_char) {
 }
 
 #[inline(always)]
-pub unsafe fn luaL_addsize(B: *mut luaL_Buffer, s: size_t) {
+pub unsafe fn luaL_addsize(B: *mut luaL_Buffer, s: usize) {
     (*B).n += s;
 }
 
 extern "C" {
     pub fn luaL_buffinit(L: *mut lua_State, B: *mut luaL_Buffer);
-    pub fn luaL_prepbuffsize(B: *mut luaL_Buffer, sz: size_t) -> *mut c_char;
-    pub fn luaL_addlstring(B: *mut luaL_Buffer, s: *const c_char, l: size_t);
+    pub fn luaL_prepbuffsize(B: *mut luaL_Buffer, sz: usize) -> *mut c_char;
+    pub fn luaL_addlstring(B: *mut luaL_Buffer, s: *const c_char, l: usize);
     pub fn luaL_addstring(B: *mut luaL_Buffer, s: *const c_char);
     pub fn luaL_addvalue(B: *mut luaL_Buffer);
     pub fn luaL_pushresult(B: *mut luaL_Buffer);
-    pub fn luaL_pushresultsize(B: *mut luaL_Buffer, sz: size_t);
-    pub fn luaL_buffinitsize(L: *mut lua_State, B: *mut luaL_Buffer, sz: size_t) -> *mut c_char;
+    pub fn luaL_pushresultsize(B: *mut luaL_Buffer, sz: usize);
+    pub fn luaL_buffinitsize(L: *mut lua_State, B: *mut luaL_Buffer, sz: usize) -> *mut c_char;
 }
 
 pub unsafe fn luaL_prepbuffer(B: *mut luaL_Buffer) -> *mut c_char {
-    luaL_prepbuffsize(B, LUAL_BUFFERSIZE as size_t)
-}
-
-#[repr(C)]
-pub struct luaL_Stream {
-    pub f: *mut ::libc::FILE,
-    pub closef: lua_CFunction,
+    luaL_prepbuffsize(B, LUAL_BUFFERSIZE as usize)
 }
 
 // omitted: old module system compatibility
diff --git a/src/ffi/lua.rs b/src/ffi/lua.rs
index cb0d1f5..3c29a04 100644
--- a/src/ffi/lua.rs
+++ b/src/ffi/lua.rs
@@ -22,7 +22,7 @@
 
 //! Contains definitions from `lua.h`.
 
-use libc::{c_char, c_int, c_uchar, c_void, size_t};
+use std::os::raw::{c_char, c_int, c_uchar, c_void};
 use std::ptr;
 
 use super::luaconf;
@@ -96,16 +96,16 @@ pub type lua_KFunction =
 
 // Type for functions that read/write blocks when loading/dumping Lua chunks
 pub type lua_Reader =
-    unsafe extern "C" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut size_t) -> *const c_char;
+    unsafe extern "C" fn(L: *mut lua_State, ud: *mut c_void, sz: *mut usize) -> *const c_char;
 pub type lua_Writer =
-    unsafe extern "C" fn(L: *mut lua_State, p: *const c_void, sz: size_t, ud: *mut c_void) -> c_int;
+    unsafe extern "C" fn(L: *mut lua_State, p: *const c_void, sz: usize, ud: *mut c_void) -> c_int;
 
 /// Type for memory-allocation functions.
 pub type lua_Alloc = unsafe extern "C" fn(
     ud: *mut c_void,
     ptr: *mut c_void,
-    osize: size_t,
-    nsize: size_t,
+    osize: usize,
+    nsize: usize,
 ) -> *mut c_void;
 
 extern "C" {
@@ -141,8 +141,8 @@ extern "C" {
     pub fn lua_tonumberx(L: *mut lua_State, idx: c_int, isnum: *mut c_int) -> lua_Number;
     pub fn lua_tointegerx(L: *mut lua_State, idx: c_int, isnum: *mut c_int) -> lua_Integer;
     pub fn lua_toboolean(L: *mut lua_State, idx: c_int) -> c_int;
-    pub fn lua_tolstring(L: *mut lua_State, idx: c_int, len: *mut size_t) -> *const c_char;
-    pub fn lua_rawlen(L: *mut lua_State, idx: c_int) -> size_t;
+    pub fn lua_tolstring(L: *mut lua_State, idx: c_int, len: *mut usize) -> *const c_char;
+    pub fn lua_rawlen(L: *mut lua_State, idx: c_int) -> usize;
     pub fn lua_tocfunction(L: *mut lua_State, idx: c_int) -> lua_CFunction;
     pub fn lua_touserdata(L: *mut lua_State, idx: c_int) -> *mut c_void;
     pub fn lua_tothread(L: *mut lua_State, idx: c_int) -> *mut lua_State;
@@ -183,7 +183,7 @@ extern "C" {
     pub fn lua_pushnil(L: *mut lua_State);
     pub fn lua_pushnumber(L: *mut lua_State, n: lua_Number);
     pub fn lua_pushinteger(L: *mut lua_State, n: lua_Integer);
-    pub fn lua_pushlstring(L: *mut lua_State, s: *const c_char, l: size_t) -> *const c_char;
+    pub fn lua_pushlstring(L: *mut lua_State, s: *const c_char, l: usize) -> *const c_char;
     pub fn lua_pushstring(L: *mut lua_State, s: *const c_char) -> *const c_char;
     // TODO: omitted:
     // lua_pushvfstring
@@ -205,7 +205,7 @@ extern "C" {
     pub fn lua_rawgetp(L: *mut lua_State, idx: c_int, p: *const c_void) -> c_int;
 
     pub fn lua_createtable(L: *mut lua_State, narr: c_int, nrec: c_int);
-    pub fn lua_newuserdata(L: *mut lua_State, sz: size_t) -> *mut c_void;
+    pub fn lua_newuserdata(L: *mut lua_State, sz: usize) -> *mut c_void;
     pub fn lua_getmetatable(L: *mut lua_State, objindex: c_int) -> c_int;
     pub fn lua_getuservalue(L: *mut lua_State, idx: c_int) -> c_int;
 }
@@ -304,7 +304,7 @@ extern "C" {
     pub fn lua_next(L: *mut lua_State, idx: c_int) -> c_int;
     pub fn lua_concat(L: *mut lua_State, n: c_int);
     pub fn lua_len(L: *mut lua_State, idx: c_int);
-    pub fn lua_stringtonumber(L: *mut lua_State, s: *const c_char) -> size_t;
+    pub fn lua_stringtonumber(L: *mut lua_State, s: *const c_char) -> usize;
     pub fn lua_getallocf(L: *mut lua_State, ud: *mut *mut c_void) -> lua_Alloc;
     pub fn lua_setallocf(L: *mut lua_State, f: lua_Alloc, ud: *mut c_void);
 }
@@ -392,7 +392,7 @@ pub unsafe fn lua_isnoneornil(L: *mut lua_State, n: c_int) -> c_int {
 pub unsafe fn lua_pushliteral(L: *mut lua_State, s: &'static str) -> *const c_char {
     use std::ffi::CString;
     let c_str = CString::new(s).unwrap();
-    lua_pushlstring(L, c_str.as_ptr(), c_str.as_bytes().len() as size_t)
+    lua_pushlstring(L, c_str.as_ptr(), c_str.as_bytes().len())
 }
 
 #[inline(always)]
diff --git a/src/ffi/luaconf.rs b/src/ffi/luaconf.rs
index 7adf54d..ad33352 100644
--- a/src/ffi/luaconf.rs
+++ b/src/ffi/luaconf.rs
@@ -33,9 +33,9 @@ pub use super::glue::{LUA_MAXINTEGER, LUA_MININTEGER};
 pub use super::glue::LUAI_MAXSTACK;
 pub use super::glue::LUAL_NUMSIZES;
 
-pub use super::glue::LUA_KCONTEXT;
+pub type LUA_KCONTEXT = isize; // intptr_t
 
-use libc::c_int;
+use std::os::raw::c_int;
 
 #[inline(always)]
 pub unsafe fn lua_numtointeger(n: LUA_NUMBER, p: *mut LUA_INTEGER) -> c_int {
diff --git a/src/ffi/lualib.rs b/src/ffi/lualib.rs
index c25609d..520e499 100644
--- a/src/ffi/lualib.rs
+++ b/src/ffi/lualib.rs
@@ -22,7 +22,7 @@
 
 //! Contains definitions from `lualib.h`.
 
-use libc::c_int;
+use std::os::raw::c_int;
 
 use super::lua::lua_State;
 
diff --git a/src/ffi/mod.rs b/src/ffi/mod.rs
index f45c227..8e41355 100644
--- a/src/ffi/mod.rs
+++ b/src/ffi/mod.rs
@@ -159,7 +159,7 @@ pub use self::lua::{
 };
 
 // auxiliary library types
-pub use self::lauxlib::{luaL_Buffer, luaL_Reg, luaL_Stream};
+pub use self::lauxlib::{luaL_Buffer, luaL_Reg};
 
 // auxiliary library functions
 pub use self::lauxlib::{
diff --git a/tests/_lua.rs b/tests/_lua.rs
index 405e5b2..4d49a76 100644
--- a/tests/_lua.rs
+++ b/tests/_lua.rs
@@ -1,29 +1,29 @@
 #[allow(non_camel_case_types)]
-type lua_State = libc::c_void;
+type lua_State = std::os::raw::c_void;
 
 #[allow(non_camel_case_types)]
-type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> libc::c_int;
+type lua_CFunction = unsafe extern "C" fn(L: *mut lua_State) -> std::os::raw::c_int;
 
 extern "C" {
     fn luaL_newstate() -> *mut lua_State;
 
     fn luaL_requiref(
         L: *mut lua_State,
-        modname: *const libc::c_char,
+        modname: *const std::os::raw::c_char,
         openf: lua_CFunction,
-        glb: libc::c_int,
+        glb: std::os::raw::c_int,
     );
 
-    fn lua_settop(L: *mut lua_State, idx: libc::c_int);
+    fn lua_settop(L: *mut lua_State, idx: std::os::raw::c_int);
 
-    fn luaopen_base(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_coroutine(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_table(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_io(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_os(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_string(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_math(L: *mut lua_State) -> libc::c_int;
-    fn luaopen_package(L: *mut lua_State) -> libc::c_int;
+    fn luaopen_base(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_coroutine(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_table(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_io(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_os(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_string(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_math(L: *mut lua_State) -> std::os::raw::c_int;
+    fn luaopen_package(L: *mut lua_State) -> std::os::raw::c_int;
 }
 
 #[allow(unused)]