kc3-lang/sys_wait

diff --git a/example.c b/example.c
index be7f97a..2d1e1a0 100644
--- a/example.c
+++ b/example.c
@@ -1,6 +1,11 @@
 #define _XOPEN_SOURCE 500
 
 #include <stdlib.h>
+
+#ifdef __MINGW32__
+#include <sys/types.h>
+#endif /* __MINGW32__ */
+
 #include <sys/wait.h>
 
 #include <windows.h>
diff --git a/sys/wait.h b/sys/wait.h
index d0f6491..8922dc5 100644
--- a/sys/wait.h
+++ b/sys/wait.h
@@ -115,11 +115,12 @@ extern "C" {
 #define WSTOPSIG(status) __WSTOPSIG(status)
 #endif /* WSTOPSIG */
 
-#ifndef __pid_t_defined
+#if !defined(__pid_t_defined) && !defined(_PID_T_)
 #define __pid_t_defined 1
+#define _PID_T_
 typedef int __pid_t;
 typedef __pid_t pid_t;
-#endif /* __pid_t_defined */
+#endif /* !defined(__pid_t_defined) && !defined(_PID_T_) */
 
 #ifndef __id_t_defined
 #define __id_t_defined 1