diff --git a/vlib/builtin/builtin_nix.c.v b/vlib/builtin/builtin_nix.c.v
index ef5b153630..77b6ed622c 100644
--- a/vlib/builtin/builtin_nix.c.v
+++ b/vlib/builtin/builtin_nix.c.v
@@ -3,7 +3,6 @@
 // that can be found in the LICENSE file.
 module builtin
 
-
 //pub fn vsyscall(id int
 //
 
diff --git a/vlib/builtin/cfns.c.v b/vlib/builtin/cfns.c.v
index 7225d03373..fd069629f3 100644
--- a/vlib/builtin/cfns.c.v
+++ b/vlib/builtin/cfns.c.v
@@ -401,3 +401,10 @@ fn C.WaitForSingleObject(voidptr, int) int
 
 
 fn C.ReleaseMutex(voidptr) bool
+
+// pthread.h
+
+fn C.pthread_mutex_init(voidptr, voidptr) int
+fn C.pthread_mutex_lock(voidptr) int
+fn C.pthread_mutex_unlock(voidptr) int
+
diff --git a/vlib/live/common.v b/vlib/live/common.v
index 7eaa585134..374d8d78e8 100644
--- a/vlib/live/common.v
+++ b/vlib/live/common.v
@@ -26,6 +26,7 @@ pub mut:
 	cb_after          FNLiveReloadCB = 0 // executed after a reload try happened, even if failed
 	cb_locked_before  FNLiveReloadCB = 0 // executed before lib reload, in the mutex section
 	cb_locked_after   FNLiveReloadCB = 0 // executed after lib reload, in the mutex section
+	user_ptr          voidptr = 0 // you can set it to anything, then retrieve it in the cb_ fns
 }
 
 // LiveReloadInfo.live_linkfn should be called by the reloader
diff --git a/vlib/live/executable/reloader.v b/vlib/live/executable/reloader.v
index 14a3fd1d29..9d8f3df0b8 100644
--- a/vlib/live/executable/reloader.v
+++ b/vlib/live/executable/reloader.v
@@ -8,9 +8,6 @@ import live
 
 // The live reloader code is implemented here.
 
-fn C.pthread_mutex_unlock(mtx voidptr)
-fn C.pthread_mutex_lock(mtx voidptr)
-
 // NB: new_live_reload_info will be called by generated C code inside main()
 pub fn new_live_reload_info(original string, vexe string, vopts string, live_fn_mutex voidptr, live_linkfn live.FNLinkLiveSymbols) &live.LiveReloadInfo {
 	file_base := os.file_name(original).replace('.v', '')
diff --git a/vlib/sync/sync_nix.c.v b/vlib/sync/sync_nix.c.v
index ad6dedf413..cb14de141b 100644
--- a/vlib/sync/sync_nix.c.v
+++ b/vlib/sync/sync_nix.c.v
@@ -3,11 +3,6 @@
 // that can be found in the LICENSE file.
 module sync
 
-#include <pthread.h>
-fn C.pthread_mutex_init(voidptr, voidptr) int
-fn C.pthread_mutex_lock(voidptr) int
-fn C.pthread_mutex_unlock(voidptr) int
-
 // [init_with=new_mutex] // TODO: implement support for this struct attribute, and disallow Mutex{} from outside the sync.new_mutex() function.
 [ref_only]
 pub struct Mutex {