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diff --git a/src/git/common.h b/src/git/common.h
new file mode 100644
index 000000000..47ee6e207
--- /dev/null
+++ b/src/git/common.h
@@ -0,0 +1,92 @@
+/*
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2,
+ * as published by the Free Software Foundation.
+ *
+ * In addition to the permissions in the GNU General Public License,
+ * the authors give you unlimited permission to link the compiled
+ * version of this file into combinations with other programs,
+ * and to distribute those combinations without any restriction
+ * coming from the use of this file.  (The General Public License
+ * restrictions do apply in other respects; for example, they cover
+ * modification of the file, and distribution when not linked into
+ * a combined executable.)
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDE_git_common_h__
+#define INCLUDE_git_common_h__
+
+#ifdef __cplusplus
+# define GIT_BEGIN_DECL  extern "C" {
+# define GIT_END_DECL    }
+#else
+  /** Start declarations in C mode */
+# define GIT_BEGIN_DECL  /* empty */
+  /** End declarations in C mode */
+# define GIT_END_DECL    /* empty */
+#endif
+
+/** Declare a public function exported for application use. */
+#ifdef __GNUC__
+# define GIT_EXTERN(type) extern \
+                          __attribute__((visibility("default"))) \
+                          type
+#else
+# define GIT_EXTERN(type) extern type
+#endif
+
+/** Declare a function as always inlined. */
+# define GIT_INLINE(type) static inline type
+
+/** Declare a function's takes printf style arguments. */
+#ifdef __GNUC__
+# define GIT_FORMAT_PRINTF(a,b) __attribute__((format (printf, a, b)))
+#else
+# define GIT_FORMAT_PRINTF(a,b) /* empty */
+#endif
+
+/**
+ * @file git/common.h
+ * @brief Git common platform definitions
+ * @defgroup git_common Git common platform definitions
+ * @ingroup Git
+ * @{
+ */
+
+/** Operation completed successfully. */
+#define GIT_SUCCESS 0
+
+/**
+ * Operation failed, with unspecified reason.
+ * This value also serves as the base error code; all other
+ * error codes are subtracted from it such that all errors
+ * are < 0, in typical POSIX C tradition.
+ */
+#define GIT_ERROR -1
+
+/** Input was not a properly formatted Git object id. */
+#define GIT_ENOTOID (GIT_ERROR - 1)
+
+/** Input does not exist in the scope searched. */
+#define GIT_ENOTFOUND (GIT_ERROR - 2)
+
+#include "git/config.h"
+
+GIT_BEGIN_DECL
+
+/** A revision traversal pool. */
+typedef struct git_revpool git_revpool;
+
+/** @} */
+GIT_END_DECL
+#endif