Document Qt5 build for Linux and BSD

INSTALL_FREEBSD.md

@@ -9,33 +9,33 @@ Natron on FreeBSD.
 In order to have Natron compiling, first you need to install the required libraries.
 
 ```
-pkg install qt4 boost-all pyside-py27 expat cairo pkgconf
+pkg install qt5 boost-all pyside2 expat cairo pkgconf
 ```
 
 ### Submodules
 
 Go under Natron and type
 
-    git submodule update -i --recursive
-
+```
+git submodule update -i --recursive
+```
 
-###Add the config.pri file
+### Add the config.pri file
 
-You have to define the locations of some required libraries.
-This is done by creating a .pri file next to the Project.pro that will tell the .pro
-where to find those libraries.
-The only library to put in the config.pri file on unix systems is boost.
+You might need to define the locations of some of the required libraries.
+This is done by creating a `.pri` file next to the `Project.pro` that will tell the `.pro` where to find those libraries.
+The only library to put in the `config.pri` file on unix systems is boost.
 For all other libraries are found with PKGConfig.
 
-
-- create the config.pri file next to the Project.pro file.
-
+Then you can create the `config.pri` file next to the `Project.pro` file just in case you need to pass more configurations.
 You can fill it with the following proposed code to point to the libraries.
- Of course you need to provide valid paths that are valid on your system.
+Of course you need to provide valid paths that are valid on your system.
+
+`INCLUDEPATH` is the path to the include files
 
-INCLUDEPATH is the path to the include files
+`LIBS` is the path to the libs
 
-LIBS is the path to the libs
+The following `config.pri` adds `boost_serialization` to the libraries, `cairo`, `expat` and `fontconfig` to pkgconfig and removes static `cairo`.
 
 ```pri
 boost: LIBS += -lboost_serialization
@@ -45,42 +45,32 @@ cairo {
         PKGCONFIG += cairo
         LIBS -=  $$system(pkg-config --variable=libdir cairo)/libcairo.a
 }
-pyside {
-        PKGCONFIG -= pyside
-        INCLUDEPATH += $$system(pkg-config --variable=includedir pyside)
-        INCLUDEPATH += $$system(pkg-config --variable=includedir pyside)/QtCore
-        INCLUDEPATH += $$system(pkg-config --variable=includedir pyside)/QtGui
-        INCLUDEPATH += $$system(pkg-config --variable=includedir QtGui)
-        LIBS += -lpyside-python2.7
-}
-shiboken {
-        PKGCONFIG -= shiboken
-        INCLUDEPATH += $$system(pkg-config --variable=includedir shiboken)
-        LIBS += -lshiboken-python2.7
-}
 ```
 
 ###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-v2.4.tar.gz).
 Place it at the root of Natron repository.
 
 ### Build
 
-The <srcPath> must be absolute and <buildPath> must not be a subdir of <srcPath>
+The `<srcPath>` must be absolute and `<buildPath>` must not be a subdir of `<srcPath>`
 
-    mkdir <buildPath>
-    cd <buildfolder>
-    qmake -r CONFIG+=disable-breakpad <srcPath>/Project.pro
-    make
+```
+mkdir <buildPath>
+cd <buildfolder>
+qmake -r CONFIG+=disable-breakpad <srcPath>/Project.pro
+make
+```
 
 If you want to build in DEBUG mode change the qmake call to this line:
 
-    qmake -r CONFIG+=debug CONFIG+=disable-breakpad <srcPath>/Project.pro
+```
+qmake -r CONFIG+=debug CONFIG+=disable-breakpad <srcPath>/Project.pro
+```
 
-Some debug options are available for developers of Natron and you can see them in the
-global.pri file. To enable an option just add CONFIG+=<option> in the qmake call.
+Some debug options are available for developers of Natron and you can see them in the `global.pri` file. To enable an option just add `CONFIG+=<option>` in the qmake call.
 
 ### Nodes
 
@@ -89,15 +79,17 @@ Natron's nodes are contained in separate repositories. To use the default nodes,
     https://github.com/NatronGitHub/openfx-misc
     https://github.com/NatronGitHub/openfx-io
 
-You'll find installation instructions in the README of both these repositories. Both openfx-misc and openfx-io have submodules as well.
+You'll find installation instructions in the `README` of both these repositories. Both openfx-misc and openfx-io have submodules as well.
 
-Plugins must be installed in /usr/OFX/Plugins on FreeBSD
-Or in a directory named "Plugins" located in the parent directory where the binary lies, e.g.:
+Plugins can be installed in `/usr/OFX/Plugins` on FreeBSD.
+Or in a directory named "`Plugins`" located in the parent directory where the binary lies, e.g.:
 
-    bin/
-        Natron
-    Plugins/
-        IO.ofx.bundle
+```
+bin/
+    Natron
+Plugins/
+    IO.ofx.bundle
+```
 
 ### OpenColorIO configs