composer install reports libmysqlclient_18 error

System environment: ubuntu 14.04 64-bit
php version: 7.0.0
mysql version: 5.7.10
composer version: 1.2.1

php is installed from the source package, and mysql is installed after decompressing the binary package

The content of the require file is as follows

<code>{
        "require" : {
                "swiftmailer/swiftmailer": "5.3.*@dev",
                "phpoffice/phpexcel": "dev-master"
        }
}</code>

The following error will be reported after execution, no matter what the above require is written

<code class="shell">$ composer install
Loading composer repositories with package information
php: relocation error: php: symbol inflateInit2_, version libmysqlclient_18 not defined in file libmysqlclient.so.18 with link time reference</code>

There is a libmysqlclient.so.18 under /usr/lib/
I also tried to install it and did the following operations

<code class="shell">$ sudo apt-get install libmysqlclient-dev</code>

Please tell me, is it because I didn’t add compilation options to my php or something... I really don’t understand it

Reply content:

System environment: ubuntu 14.04 64-bit
php version: 7.0.0
mysql version: 5.7.10
composer version: 1.2.1

php is installed from the source package, and mysql is installed after decompressing the binary package

The content of the require file is as follows

<code>{
        "require" : {
                "swiftmailer/swiftmailer": "5.3.*@dev",
                "phpoffice/phpexcel": "dev-master"
        }
}</code>

The following error will be reported after execution, no matter what the above require is written

<code class="shell">$ composer install
Loading composer repositories with package information
php: relocation error: php: symbol inflateInit2_, version libmysqlclient_18 not defined in file libmysqlclient.so.18 with link time reference</code>

There is a libmysqlclient.so.18 under /usr/lib/
I also tried to install it and did the following operations

<code class="shell">$ sudo apt-get install libmysqlclient-dev</code>

Please tell me, is it because I didn’t add compilation options to my php or something... I really don’t understand it