thodg/libgit2

diff --git a/include/git2/common.h b/include/git2/common.h
index 1af045c..0af37e8 100644
--- a/include/git2/common.h
+++ b/include/git2/common.h
@@ -103,6 +103,29 @@ GIT_EXTERN(int) git_strarray_copy(git_strarray *tgt, const git_strarray *src);
  */
 GIT_EXTERN(void) git_libgit2_version(int *major, int *minor, int *rev);
 
+/**
+ * Combinations of these values describe the capabilities of libgit2.
+ */
+enum {
+	GIT_CAP_THREADS			= ( 1 << 0 ),
+	GIT_CAP_HTTPS			= ( 1 << 1 )
+};
+
+/**
+ * Query compile time options for libgit2.
+ *
+ * @return A combination of GIT_CAP_* values.
+ *
+ * - GIT_CAP_THREADS
+ *   Libgit2 was compiled with thread support. Note that thread support is still to be seen as a
+ *   'work in progress'.
+ *
+ * - GIT_CAP_HTTPS
+ *   Libgit2 supports the https:// protocol. This requires the open ssl library to be
+ *   found when compiling libgit2.
+ */
+GIT_EXTERN(int) git_libgit2_capabilities(void);
+
 /** @} */
 GIT_END_DECL
 #endif
diff --git a/src/util.c b/src/util.c
index 90bb3d0..51bf843 100644
--- a/src/util.c
+++ b/src/util.c
@@ -22,6 +22,18 @@ void git_libgit2_version(int *major, int *minor, int *rev)
 	*rev = LIBGIT2_VER_REVISION;
 }
 
+int git_libgit2_capabilities()
+{
+	return 0
+#ifdef GIT_THREADS
+		| GIT_CAP_THREADS
+#endif
+#ifdef GIT_SSL
+		| GIT_CAP_HTTPS
+#endif
+	;
+}
+
 void git_strarray_free(git_strarray *array)
 {
 	size_t i;