Swoole make failed ubuntu16.04 - makefile

Question

I am trying to install SWOOLE on my Ubuntu-16.04
I tried this sudo pecl install swoole
But am getting a long list of errors(Skipped some lines)
In file included from /tmp/pear/temp/swoole/php_swoole.h:156:0,
from /tmp/pear/temp/swoole/swoole.c:16:
/tmp/pear/temp/swoole/php7_wrapper.h: In function 'sw_zend_is_callable':
/tmp/pear/temp/swoole/php7_wrapper.h:238:5: error: unknown type name 'zend_string'
zend_string *key = NULL;
^
/tmp/pear/temp/swoole/php7_wrapper.h:239:5: warning: passing argument 3 of 'zend_is_callable' from incompatible pointer type [enabled by default]
int ret = zend_is_callable(cb, a, &key);
^
In file included from /usr/include/php5/main/php.h:39:0,
from /tmp/pear/temp/swoole/php_swoole.h:25,
from /tmp/pear/temp/swoole/swoole.c:16:
/usr/include/php5/Zend/zend_API.h:301:20: note: expected 'char **' but argument is of type 'int **'
ZEND_API zend_bool zend_is_callable(zval *callable, uint check_flags, char **callable_name TSRMLS_DC);
^
In file included from /usr/include/php5/Zend/zend.h:252:0,
from /usr/include/php5/main/php.h:35,
from /tmp/pear/temp/swoole/php_swoole.h:25,
from /tmp/pear/temp/swoole/swoole.c:16:
/tmp/pear/temp/swoole/php7_wrapper.h:240:29: error: request for member 'val' in something not a structure or union
char *tmp = estrndup(key->val, key->len);
^
/usr/include/php5/Zend/zend_alloc.h:78:44: note: in definition of macro 'estrndup'
#define estrndup(s, length) _estrndup((s), (length) ZEND_FILE_LINE_CC ZEND_FILE_LINE_EMPTY_CC)
^
/tmp/pear/temp/swoole/php7_wrapper.h:240:39: error: request for member 'len' in something not a structure or union
char *tmp = estrndup(key->val, key->len);
^
/usr/include/php5/Zend/zend_alloc.h:78:49: note: in definition of macro 'estrndup'
#define estrndup(s, length) _estrndup((s), (length) ZEND_FILE_LINE_CC ZEND_FILE_LINE_EMPTY_CC)
^
In file included from /tmp/pear/temp/swoole/php_swoole.h:156:0,
from /tmp/pear/temp/swoole/swoole.c:16:
/tmp/pear/temp/swoole/php7_wrapper.h: In function 'sw_zend_is_callable_ex':
/tmp/pear/temp/swoole/php7_wrapper.h:248:5: error: unknown type name 'zend_string'
zend_string *key = NULL;
^
/tmp/pear/temp/swoole/php7_wrapper.h:249:5: warning: passing argument 4 of 'zend_is_callable_ex' from incompatible pointer type [enabled by default]
int ret = zend_is_callable_ex(callable, NULL, check_flags, &key, fcc, error);
make: *** [swoole.lo] Error 1
ERROR: `make' failed
I have also tried this
cd swoole-src
./configure
make
Which is also giving the similar errors.
How to solve this? thanks in advance!
EDIT : Added the first Generated ERRORS too