PyPy does not provide the PyArg_NoArgs macro.
--- a/src/rl_addons/rl_accel/sgmlop.c
+++ b/src/rl_addons/rl_accel/sgmlop.c
@@ -52,6 +52,9 @@
  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  */
 
 #include "Python.h"
+#ifndef PyArg_NoArgs
+#define PyArg_NoArgs(v) PyArg_Parse(v, "")
+#endif
 #if PY_VERSION_HEX < 0x02050000
 #	define Py_ssize_t int
 #	define lenfunc inquiry