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--- a/libc/sysdeps/linux/common/prctl.c
+++ b/libc/sysdeps/linux/common/prctl.c
@@ -12,6 +12,24 @@
/* psm: including sys/prctl.h would depend on kernel headers */
#ifdef __NR_prctl
-extern int prctl (int, long, long, long, long);
-_syscall5(int, prctl, int, option, long, arg2, long, arg3, long, arg4, long, arg5)
+#define __NR___syscall_prctl __NR_prctl
+static inline _syscall5(int, __syscall_prctl, int, option, long, arg2, long, arg3, long,
+ arg4, long, arg5);
+
+int prctl(int option, ...) {
+ long arg2 = 0;
+ long arg3 = 0;
+ long arg4 = 0;
+ long arg5 = 0;
+ va_list ap;
+
+ va_start(ap, option);
+ arg2 = va_arg(ap, long);
+ arg3 = va_arg(ap, long);
+ arg4 = va_arg(ap, long);
+ arg5 = va_arg(ap, long);
+ va_end(ap);
+
+ return __syscall_prctl(option, arg2, arg3, arg4, arg5);
+}
#endif
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