Index: bindings/cxx/classes.cpp
--- bindings/cxx/classes.cpp.orig
+++ bindings/cxx/classes.cpp
@@ -17,12 +17,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* Needed for isascii(), as used in the GNU libstdc++ headers */
-/* Needed in strutil.c for POSIX.1-2008 locale functions */
-#ifndef _XOPEN_SOURCE
-#define _XOPEN_SOURCE 700
-#endif
-
 #include <config.h>
 #include <libsigrokcxx/libsigrokcxx.hpp>