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-rw-r--r--lib/ssluse.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/ssluse.c b/lib/ssluse.c
index 38ad2b1ff..67fd99a38 100644
--- a/lib/ssluse.c
+++ b/lib/ssluse.c
@@ -76,6 +76,10 @@
/* The last #include file should be: */
#include "memdebug.h"
+#ifndef OPENSSL_VERSION_NUMBER
+#error "OPENSSL_VERSION_NUMBER not defined"
+#endif
+
#if OPENSSL_VERSION_NUMBER >= 0x0090581fL
#define HAVE_SSL_GET1_SESSION 1
#else