update INSTALL_LINUX.md

following suggestions by @Ivanohe73 in NatronGitHub#386

INSTALL_LINUX.md

@@ -46,23 +46,14 @@ The SDK may be updated by pulling the last modifications to the script and re-ex
 
 ### Environment to use the Natron SDK
 
-Once the SDK is built, you should set your environment as follows, to make sure that the Natron SDK is preferred over any other system library. This must be done in every terminal where you intend to compile and/or run Natron:
+Once the SDK is built, you should set your environment in the shell from which you execute or test Natron, to make sure that the Natron SDK is preferred over any other system library:
 
 ```
-SDK=/opt/Natron-sdk
-GCC="$SDK/gcc"
-QTDIR="$SDK/qt4"
-FFMPEG="$SDK/ffmpeg-gpl2"
-LIBRAW="$SDK/libraw-gpl2"
-PATH="$SDK/bin:$QTDIR/bin:$GCC/bin:$FFMPEG/bin:$LIBRAW_PATH:$PATH"
-LIBRARY_PATH="$SDK/lib:$QTDIR/lib:$GCC/lib64:$GCC/lib:$FFMPEG/lib:$LIBRAW/lib"
-LD_LIBRARY_PATH="$SDK/lib:$QTDIR/lib:$GCC/lib64:$GCC/lib:$FFMPEG/lib:$LIBRAW/lib"
-LD_RUN_PATH="$SDK/lib:$QTDIR/lib:$GCC/lib:$FFMPEG/lib:$LIBRAW/lib"
-CPATH="$SDK/include:$QTDIR/include:$GCC/include:$FFMPEG/include:$LIBRAW/include"
-export PKG_CONFIG_PATH="$SDK/lib/pkgconfig:$SDK/osmesa/lib/pkgconfig:$QTDIR/lib/pkgconfig:$GCC/lib/pkgconfig:$FFMPEG/lib/pkgconfig:$LIBRAW/lib/pkgconfig"
-export QTDIR LD_LIBRARY_PATH LD_RUN_PATH PKG_CONFIG_PATH CPATH
+. path_to_Natron_sources/tools/utils/natron-sdk-setup-linux.sh
 ```
 
+This must be done in every shell/terminal where you intend to compile and/or run Natron.
+
 ## Manually install dependencies
 
 Alternatively, *if you don't want to use the Natron SDK*, you still need to install the required libraries.
@@ -129,10 +120,23 @@ git submodule update -i --recursive
 ### Download OpenColorIO-Configs
 
 In the past, OCIO configs were a submodule, though due to the size of the repository, we have chosen instead
-to make a tarball release and let you download it [here](https://github.com/NatronGitHub/OpenColorIO-Configs/archive/Natron-v2.1.tar.gz).
+to make a tarball release and let you download it [here](https://github.com/NatronGitHub/OpenColorIO-Configs/archive/Natron-v2.3.tar.gz).
 Place it at the root of Natron repository.
 
-***note:*** *If it is name something like: `OpenColorIO-Configs-Natron-v2.0` rename it to `OpenColorIO-Configs`*
+***note:*** *If it is name something like: `OpenColorIO-Configs-Natron-v2.3` rename it to `OpenColorIO-Configs`*
+
+
+```
+wget https://github.com/NatronGitHub/OpenColorIO-Configs/archive/Natron-v2.3.tar.gz
+tar -xvzf Natron-v2.3.tar.gz
+mv OpenColorIO-Configs-Natron-v2.3 OpenColorIO-Configs
+```
+
+***note:*** In order to reclaim disk space, you may keep only the following subfolder : blender*, natron, nuke-default
+
+```
+(cd OpenColorIO-Configs && rm -v !("blender"|"blender-cycles"|"natron"|"nuke-default") -R)
+```
 
 ### config.pri
 

tools/utils/natron-sdk-setup-linux.sh

@@ -1,6 +1,6 @@
 # Source this file from a shell to setup the environment for Natron
 # compilation and tests where the Natron source tree is:
-# . path_to/natron-sdk-setup.sh
+# . path_to_Natron_sources/tools/utils/natron-sdk-setup-linux.sh
 SCRIPTPATH="$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )"
 NATRON="$( dirname "$( dirname "$SCRIPTPATH" )" )"
 TOP_SOURCES="$( dirname "${NATRON}" )"
@@ -15,13 +15,14 @@ LIBRARY_PATH="$SDK/lib:$QTDIR/lib:$GCC/lib64:$GCC/lib:$FFMPEG/lib:$LIBRAW/lib"
 LD_LIBRARY_PATH="$SDK/lib:$QTDIR/lib:$GCC/lib64:$GCC/lib:$FFMPEG/lib:$LIBRAW/lib"
 LD_RUN_PATH="$SDK/lib:$QTDIR/lib:$GCC/lib:$FFMPEG/lib:$LIBRAW/lib"
 CPATH="$SDK/include:$QTDIR/include:$GCC/include:$FFMPEG/include:$LIBRAW/include"
-export PKG_CONFIG_PATH="$SDK/lib/pkgconfig:$SDK/osmesa/lib/pkgconfig:$QTDIR/lib/pkgconfig:$GCC/lib/pkgconfig:$FFMPEG/lib/pkgconfig:$LIBRAW/lib/pkgconfig"
-export QTDIR LD_LIBRARY_PATH LD_RUN_PATH PKG_CONFIG_PATH CPATH
+PKG_CONFIG_PATH="$SDK/lib/pkgconfig:$SDK/osmesa/lib/pkgconfig:$QTDIR/lib/pkgconfig:$GCC/lib/pkgconfig:$FFMPEG/lib/pkgconfig:$LIBRAW/lib/pkgconfig"
+PYTHONPATH="$QTDIR/lib/python2.7/site-packages/"
+export QTDIR LD_LIBRARY_PATH LD_RUN_PATH CPATH PKG_CONFIG_PATH PYTHONPATH
 NATRON_PLUGIN_PATH="$NATRON/Gui/Resources/PyPlugs"
 OFX_PLUGIN_PATH="$HOME/Development/OFX/Plugins"
-export NATRON_PLUGIN_PATH OFX_PLUGIN_PATH
+OCIO="$HOME/Development/Natron-gforge/OpenColorIO-Configs/blender/config.ocio"
+export NATRON_PLUGIN_PATH OFX_PLUGIN_PATH OCIO
 export LANG="C"
-export OCIO="$HOME/Development/Natron-gforge/OpenColorIO-Configs/blender/config.ocio"
 echo "###################################################################"
 echo "# Shell is now setup to compile and run Natron and OpenFX plugins #"
 echo "###################################################################"