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-rw-r--r--crypto/engine/enginetest.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/crypto/engine/enginetest.c b/crypto/engine/enginetest.c
index 6f18ebd962..f152f642f1 100644
--- a/crypto/engine/enginetest.c
+++ b/crypto/engine/enginetest.c
@@ -58,9 +58,14 @@
#include <stdio.h>
#include <openssl/e_os2.h>
+/* The following defines enable the declaration of strdup(), which is an
+ extended function according to X/Open. */
#ifdef OPENSSL_SYS_VMS_DECC
# define _XOPEN_SOURCE_EXTENDED
#endif
+#ifdef OPENSSL_SYS_UNIX
+# define __USE_XOPEN_EXTENDED /* For Linux and probably anything GNU */
+#endif
#include <string.h>
#include <openssl/engine.h>
#include <openssl/err.h>