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-rw-r--r--crypto/cast/cast.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/crypto/cast/cast.h b/crypto/cast/cast.h
index b28e4e4f3b..90b45b950a 100644
--- a/crypto/cast/cast.h
+++ b/crypto/cast/cast.h
@@ -63,6 +63,8 @@
extern "C" {
#endif
+#include <openssl/opensslconf.h>
+
#ifdef OPENSSL_NO_CAST
#error CAST is disabled.
#endif