compile error of pux against PHP 5.6

gistfile1.txt

/bin/sh /var/www/Pux/ext/libtool --mode=compile cc  -I. -I/var/www/Pux/ext -DPHP_ATOM_INC -I/var/www/Pux/ext/include -I/var/www/Pux/ext/main -I/var/www/Pux/ext -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -I/opt/local/include  -DHAVE_CONFIG_H  -O3   -c /var/www/Pux/ext/pux_functions.c -o pux_functions.lo 
libtool: compile:  cc -I. -I/var/www/Pux/ext -DPHP_ATOM_INC -I/var/www/Pux/ext/include -I/var/www/Pux/ext/main -I/var/www/Pux/ext -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM -I/usr/include/php/Zend -I/usr/include/php/ext -I/usr/include/php/ext/date/lib -I/opt/local/include -DHAVE_CONFIG_H -O3 -c /var/www/Pux/ext/pux_functions.c  -fPIC -DPIC -o .libs/pux_functions.o
/var/www/Pux/ext/pux_functions.c: In function 'my_copy_zval':
/var/www/Pux/ext/pux_functions.c:80:10: error: 'IS_CONSTANT_ARRAY' undeclared (first use in this function)
     case IS_CONSTANT_ARRAY:
          ^
/var/www/Pux/ext/pux_functions.c:80:10: note: each undeclared identifier is reported only once for each function it appears in
/var/www/Pux/ext/pux_functions.c: In function 'my_zval_copy_ctor_func':
/var/www/Pux/ext/pux_functions.c:123:14: error: 'IS_CONSTANT_ARRAY' undeclared (first use in this function)
         case IS_CONSTANT_ARRAY: {
              ^
/var/www/Pux/ext/pux_functions.c: In function 'my_zval_copy_ctor_persistent_func':
/var/www/Pux/ext/pux_functions.c:179:14: error: 'IS_CONSTANT_ARRAY' undeclared (first use in this function)
         case IS_CONSTANT_ARRAY: {
              ^
make: *** [pux_functions.lo] Error 1