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-rw-r--r--crypto/ui/ui_openssl.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/crypto/ui/ui_openssl.c b/crypto/ui/ui_openssl.c
index fad17024a0..7c80f5feb2 100644
--- a/crypto/ui/ui_openssl.c
+++ b/crypto/ui/ui_openssl.c
@@ -117,10 +117,14 @@
#include <openssl/e_os2.h>
+/* need for #define _POSIX_C_SOURCE arises whenever you pass -ansi to gcc
+ * [maybe others?], because it masks interfaces not discussed in standard,
+ * sigaction and fileno included. -pedantic would be more appropriate for
+ * the intended purposes, but we can't prevent users from adding -ansi.
+ */
#define _POSIX_C_SOURCE 1
#include <signal.h>
#include <stdio.h>
-#undef _POSIX_C_SOURCE
#include <string.h>
#include <errno.h>