Installing the stable version using binary packages
Most linux distributions provide recent binary packages of Kdenlive that can be installed from your Package Manager. However, in some cases you can find more recent versions in private repositories.
Click on your distribution to get more infos:
Debian Fedora Gentoo OpenSUSE Slackware Ubuntu
Check the instructions: FreeBSD install
Mac OS X
Kdenlive and MLT can compile and run under Mac OS X. Packages are available from the MacPorts project.
Detailled infos can be found here: Mac OS X install.
Installing the current development version
Development version install
Installing from source code
Source code install