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curl (the binary itself) is installed on all droplets by default. You can install the php5-curl package to install the php curl extension on Ubuntu/Debian.
Depending on the OS on your server, you can install curl:
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<br>Ubuntu - sudo apt-get install curl libcurl3 libcurl3-dev php5-curl
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<br>CentOS - yum search curl
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<br>Based on the results you get back, you can install the curl package you want. If you want to install curl for php. You should type: yum install php-curl
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<br>I hope that helps
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