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-rw-r--r--ssl/ssltest.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ssl/ssltest.c b/ssl/ssltest.c
index 1b6b4e9493..698c84a179 100644
--- a/ssl/ssltest.c
+++ b/ssl/ssltest.c
@@ -116,6 +116,8 @@
#define _BSD_SOURCE 1 /* Or gethostname won't be declared properly
on Linux and GNU platforms. */
+#define _XOPEN_SOURCE 1 /* Ot isascii won't be declared properly on
+ VMS (at least with DECompHP C). */
#include <assert.h>
#include <errno.h>