在更新我的Fedora 24到25之后，官方的PHP版本从5.6升至7.0。因此，我安装了较旧版本以提供两者（通过remi depo）
$ php -v
PHP 7.0.13 (cli) (built: Nov 25 2016 06:03:52) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
$ php56 -v
PHP 5.6.29 (cli) (built: Dec 8 2016 07:55:50)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
我安装节点，nodejs，更少以进行干净的安装。
dnf install node nodejs
npm install -g less
，但由于我无法运行Symfony 2 Assetic命令：（使用PHP或PHP56运行它不会更改输出）
$ php app/console assetic:dump
Dumping all dev assets.
Debug mode is on.
16:06:19 [file+] /var/www/project/app/../web/css/5a72185.css
[AsseticExceptionFilterException]
An error occurred while running:
'node' '/tmp/assetic_lessjBxrsP'
Error Output:
NameError: #grid > .core > .span is undefined in /var/www/project/vendor/mopa/bootstrap-bundle/Mopa/Bundle/BootstrapBundle/Resources/bootstrap/less/navbar.less on line 199, column 3:
198 .navbar-fixed-bottom .container {
199 #grid > .core > .span(@gridColumns);
200 }
Input:
/*!
* MopaBootstrapBundle
*
* Copyright 2011 Mohrenweiser & Partner
* Licensed under the Apache License v2.0
* http://www.apache.org/licenses/LICENSE-2.0
*
* Import this file in your less files as first to be abled to access less vars from your file
* OR
* Add it to the stylesheets of assetic or
* Add it as described on http://www.lesscss.org with the less.js (maybe pathes must be adapted in that case)
*
* Be careful when using less this way, might be most straight forward, but assetic doesnt check the included files
* for changes, and will only regenerate the css if it detects changes in this file!
*
* For development it might be easier to include all you less files in the layout directly
* But then assetic will compile each less file in a own compiler session so you cant mix in the less style into bootstrap, which might not be OK
*/
// Main bootstrap.less entry point
@import "../../bootstrap/less/bootstrap.less";
// variables
@iconSpritePath: "/bundles/mopabootstrap/img/glyphicons-halflings.png";
@iconWhiteSpritePath: "/bundles/mopabootstrap/img/glyphicons-halflings-white.png";
// The Paginator less for MopaBootstrapBundle
@import "paginator.less";
// The Subnav less for MopaBootstrapBundle
@import "subnav.less";
// Collection support for MopaBootstrapBundle
@import "collections.less";
// Collection support for MopaBootstrapBundle
@import "google-maps.less";
// if you have any variables.less file INCLUDE IT AFTER EVERYTHING cause responsive.less also overrides it with the one from bootstrap!!!!!
assetic:dump [--forks FORKS] [--watch] [--force] [--period PERIOD] [--] [<write_to>]
为什么Assetic命令不起作用？
fedora升级可能已经更新了您的版本，并且不再使用您的项目。
尝试安装和使用旧版本，例如1.7.5。
sudo npm install -g less@1.7.5