Add extern "C" for C++.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@17760 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/rtbl.h

@@ -47,6 +47,10 @@
 #define __attribute__(x)
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct rtbl_data;
 typedef struct rtbl_data *rtbl_t;
 
@@ -107,4 +111,8 @@ rtbl_set_prefix (rtbl_t, const char*);
 int ROKEN_LIB_FUNCTION
 rtbl_set_separator (rtbl_t, const char*);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* __rtbl_h__ */