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 [1] | Fedora [2] | Gentoo [3] | OpenSUSE [4] | Slackware [5] | Ubuntu [6]
Check the instructions: FreeBSD install [7]
Kdenlive and MLT can compile and run under Mac OS X. Packages are available from the MacPorts [8] project.
Detailled infos can be found here: Mac OS X install [9].
Development version install [10]
Source code install [11]
Links:
[1] http://kdenlive.org/download-debian
[2] http://kdenlive.org/download-fedora
[3] http://kdenlive.org/download-gentoo
[4] http://kdenlive.org/download-opensuse
[5] http://kdenlive.org/download-slackware
[6] http://kdenlive.org/download-ubuntu
[7] http://kdenlive.org/download-freebsd
[8] http://www.macports.org/
[9] http://kdenlive.org/download-mac
[10] http://kdenlive.org/download-development
[11] http://kdenlive.org/download-source