Merge pull request #2161 from SpecLad:doc-req

diff --cc doc/tutorials/introduction/linux_install/linux_install.rst
index 8e14096,8317930..26b243f
--- 1/doc/tutorials/introduction/linux_install/linux_install.rst
--- 2/doc/tutorials/introduction/linux_install/linux_install.rst
+++ b/doc/tutorials/introduction/linux_install/linux_install.rst
@@@ -13,10 -13,10 +13,10 @@@ Required Package
  
         sudo apt-get install build-essential
  
-   * CMake 2.6 or higher;
+   * CMake 2.8.7 or higher;
    * Git;
    * GTK+2.x or higher, including headers (libgtk2.0-dev);
 -  * pkgconfig;
 +  * pkg-config;
    * Python 2.6 or later and Numpy 1.5 or later with developer packages (python-dev, python-numpy);
    * ffmpeg or libav development packages: libavcodec-dev, libavformat-dev, libswscale-dev;
    * [optional] libdc1394 2.x;