centos7下安装laravel5.6时出现pngquant失败的解决方法

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在centos7下面安装laravel5.6的时候，需要使用vue和bulma，用npm install安装的时候出现下面的错误信息：

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> pngquant-bin@4.0.0 postinstall /export/home/geoseu/monitor/node_modules/pngquant-bin
> node lib/install.js

  ⚠ The `/export/home/geoseu/monitor/node_modules/pngquant-bin/vendor/pngquant` binary doesn't seem to work correctly
  ⚠ pngquant pre-build test failed
  ℹ compiling from source
  ✔ pngquant pre-build test passed successfully
  ✖ MaxRedirectsError: pngquant failed to build, make sure that libpng-dev is installed
    at ClientRequest.fn.request.res (/export/home/geoseu/monitor/node_modules/pngquant-bin/node_modules/got/index.js:69:23)
    at Object.onceWrapper (events.js:315:30)
    at emitOne (events.js:116:13)
    at ClientRequest.emit (events.js:211:7)

用yum install libpng-devel安装后还是一样的错误。

最后参考https://stackoverflow.com/questions/29930978/node-js-imagemin-on-centos得到答案，pngquant用的libpng-devel的版本不对。

5月19日备注：不能删除原有的版本，否则nginx会因为缺少模块而无法启动。
# yum remove libpng libpng-devel

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## 先卸载原来的版本，再安装适合的版本
# yum install libpng12-1.2.50-10.el7.x86_64 libpng12-devel-1.2.50-10.el7.x86_64

用上面这个重新安装后就OK了。