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-rw-r--r--include/string.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/string.h b/include/string.h
index 047542b..dc1cca0 100644
--- a/include/string.h
+++ b/include/string.h
@@ -41,6 +41,7 @@
+#if defined(__C89__) || (_POSIX_C_SOURCE >= 200112L)
/**
* Return a textual representation of an error code.
* This error code must from `errno`.
@@ -61,7 +62,9 @@
*/
char* strerror(int)
__GCC_ONLY(__attribute__((returns_nonnull, warn_unused_result)));
+#endif
+#if _POSIX_C_SOURCE >= 200809L
/**
* Return a textual representation of an error code.
* This error code must from `errno`.
@@ -80,6 +83,7 @@ char* strerror(int)
*/
char* strerror_l(int, locale_t)
__GCC_ONLY(__attribute__((warn_unused_result))); /* TODO attributes */
+#endif
#if !defined(__PORTABLE)