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diff --git a/src/compat.h b/src/compat.h
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+/* compat.h - Various compatibility functions
+ * Copyright 2011, 2012 Gergely Nagy <algernon@balabit.hu>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBMONGO_COMPAT_H
+#define LIBMONGO_COMPAT_H 1
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#if WITH_OPENSSL
+
+#include <openssl/md5.h>
+
+typedef enum {
+  G_CHECKSUM_MD5,
+  G_CHECKSUM_SHA1,
+  G_CHECKSUM_SHA256
+} GChecksumType;
+
+typedef struct _GChecksum GChecksum;
+
+GChecksum *g_checksum_new (GChecksumType checksum_type);
+void g_checksum_free (GChecksum *checksum);
+void g_checksum_update (GChecksum *checksum,
+                        const unsigned char *data,
+                        ssize_t length);
+const char *g_checksum_get_string (GChecksum *checksum);
+
+#endif /* WITH_OPENSSL */
+
+#ifndef MSG_WAITALL
+#define MSG_WAITALL 0x40
+#endif
+
+#endif