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Install dependencies. Here's an example for Debian/Ubuntu:
-$ sudo apt-get install build-essential libirrlicht-dev cmake libbz2-dev libpng12-dev libjpeg-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev libogg-dev libvorbis-dev libopenal-dev libcurl4-gnutls-dev libfreetype6-dev zlib1g-dev libgmp-dev libjsoncpp-dev
+$ sudo apt-get install build-essential libirrlicht-dev cmake libbz2-dev libpng-dev libjpeg-dev libxxf86vm-dev libgl1-mesa-dev libsqlite3-dev libogg-dev libvorbis-dev libopenal-dev libcurl4-gnutls-dev libfreetype6-dev zlib1g-dev libgmp-dev libjsoncpp-dev
For Fedora users:
$ sudo dnf install make automake gcc gcc-c++ kernel-devel cmake libcurl* openal* libvorbis* libXxf86vm-devel libogg-devel freetype-devel mesa-libGL-devel zlib-devel jsoncpp-devel irrlicht-devel bzip2-libs gmp-devel sqlite-devel luajit-devel leveldb-devel ncurses-devel doxygen spatialindex-devel bzip2-devel
You can install git for easily keeping your copy up to date.
If you dont want git, read below on how to get the source without git.
This is an example for installing git on Debian/Ubuntu:
-$ sudo apt-get install git-core
+$ sudo apt-get install git
For Fedora users:
-$ sudo dnf install git-core
+$ sudo dnf install git
Download source (this is the URL to the latest of source repository, which might not work at all times) using git:
$ git clone --depth 1 https://github.com/minetest/minetest.git