-#include <openssl/sha.h>
-#include <openssl/rand.h>
-#include <openssl/evp.h>
+#ifdef HAVE_OPENSSL_SHA_H
+# include <openssl/sha.h>
+#else
+# include <sha.h>
+#endif
+
+#ifdef HAVE_OPENSSL_RAND_H
+# include <openssl/rand.h>
+#else
+# include <rand.h>
+#endif
+
+#ifdef HAVE_OPENSSL_EVP_H
+# include <openssl/evp.h>
+#else
+# include <evp.h>
+#endif
+