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-rw-r--r--lib/md4.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/md4.c b/lib/md4.c
index e7c77bc36..184985755 100644
--- a/lib/md4.c
+++ b/lib/md4.c
@@ -38,6 +38,10 @@
#include "curl_setup.h"
+#ifdef USE_OPENSSL
+#include <openssl/opensslconf.h>
+#endif
+
/* The NSS, OS/400, and when not included, OpenSSL and mbed TLS crypto
* libraries do not provide the MD4 hash algorithm, so we use this
* implementation of it */