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diff --git a/stdlib.h b/stdlib.h
index 51dbb0c70836..f47d0b9467ee 100644
--- a/stdlib.h
+++ b/stdlib.h
@@ -186,12 +186,8 @@ void srandom(unsigned int) __RENAME(__srandom60);
#endif
#ifdef _NETBSD_SOURCE
#define RANDOM_MAX 0x7fffffff /* (((long)1 << 31) - 1) */
-int mkostemp(char *, int);
-int mkostemps(char *, int, int);
#endif
-char *mkdtemp(char *);
-int mkstemp(char *);
char *mktemp(char *)
#ifdef __MKTEMP_OK__
__RENAME(_mktemp)
@@ -206,8 +202,6 @@ int ttyslot(void);
void *valloc(size_t); /* obsoleted by malloc() */
-int getsubopt(char **, char * const *, char **);
-
int grantpt(int);
int unlockpt(int);
char *ptsname(int);
@@ -255,6 +249,24 @@ int posix_openpt(int);
int posix_memalign(void **, size_t, size_t);
#endif
+/*
+ * The Open Group Base Specifications, Issue 7; IEEE Std 1003.1-2008 (POSIX)
+ * or
+ * X/Open Portability Guide >= Issue 4 Version 2
+ */
+#if (_POSIX_C_SOURCE - 0) >= 200809L || \
+ (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \
+ (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
+char *mkdtemp(char *);
+int mkstemp(char *);
+#ifdef _NETBSD_SOURCE
+int mkostemp(char *, int);
+int mkostemps(char *, int, int);
+#endif
+
+int getsubopt(char **, char * const *, char **);
+#endif
+
/*
* Implementation-defined extensions
*/
diff --git a/sys/cdefs.h b/sys/cdefs.h
index ac8f1e3b9faf..7370015eb513 100644
--- a/sys/cdefs.h
+++ b/sys/cdefs.h
@@ -499,13 +499,11 @@
#endif
#if !defined(_STANDALONE) && !defined(_KERNEL)
-#if defined(__GNUC__) || defined(__PCC__)
-#define __RENAME(x) ___RENAME(x)
-#elif defined(__lint__)
+#if defined(__lint__)
#define __RENAME(x) __symbolrename(x)
#else
-#error "No function renaming possible"
-#endif /* __GNUC__ */
+#define __RENAME(x) ___RENAME(x)
+#endif /* __lint__ */
#else /* _STANDALONE || _KERNEL */
#define __RENAME(x) no renaming in kernel/standalone environment
#endif
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