Error while running the make command on ubuntu,

[Dainerx]

Each time I run the make command so I can install later with make install I get this message with dozen of other errors: zend/includes.h:51:5:%20error:%20#error "This library requires PHP version 7.0 or higher. Use PHP-CPP-LEGACY for older versions." # error "This library requires PHP version 7.0 or higher. Use PHP-CPP-LEGACY

php -v gives the following:
PHP 7.0.20-1 ubuntu14.04.1+deb.sury.org+1 (cli) (built: Jun 9 2017 08:31:46) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.0.20-1~ubuntu14.04.1+deb.sury.org+1, Copyright (c) 1999-2017, by Zend Technologies

I'm quite sure I'm running php7 on my machine although I'm still get this error. Please any help would be very much appreciated.

[redagito]

Check your php-devel installation, you may run php7 but you probably have the php5.x development headers somewhere

[robocoder]

Mismatching version of php-config is picking up the php5.x includes.

On Ubuntu, use sudo update-alternatives --config php-config to switch to the right version.