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-rw-r--r--posix/sys/wait.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/posix/sys/wait.h b/posix/sys/wait.h
index e663f41e05..ed904d909b 100644
--- a/posix/sys/wait.h
+++ b/posix/sys/wait.h
@@ -29,6 +29,11 @@ __BEGIN_DECLS
 
 #include <bits/types.h>
 
+#if defined __USE_UNIX98 && !defined pid_t
+typedef __pid_t pid_t;
+# define pid_t pid_t
+#endif
+
 /* This will define the `W*' macros for the flag
    bits to `waitpid', `wait3', and `wait4'.  */
 #include <bits/waitflags.h>