$OpenBSD: patch-libbacktrace_backtrace_h,v 1.1 2011/11/14 19:14:18 sthen Exp $
--- libbacktrace/backtrace.h.orig	Fri Sep 10 00:23:45 2010
+++ libbacktrace/backtrace.h	Mon Nov 14 00:11:25 2011
@@ -16,10 +16,19 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#ifndef _EXECINFO_H_
+#define _EXECINFO_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifndef __GNUC__
 #error "this library must be compiled with gcc"
 #endif
 
+#include <dlfcn.h>
+
 #define BT_MAX_DEPTH            (128)
 
 struct bt_frame {
@@ -31,3 +40,9 @@ struct bt_frame {
 int			backtrace(void **, int);
 char			**backtrace_symbols(void *const *, int);
 void			backtrace_symbols_fd(void *const *, int, int);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
+