CentOS Build Instructions

CentOS.md

+## Building QGC on a stock CentOS:
+
+These were the options used to setup a CentOS development system. Use it as a guideline.
+
+Once the system is fully installed and running, we need to set it up for QGC development. First, we need to update GStreamer to a more recent version. This guide follows Alice Wonder's tips found here: https://media.librelamp.com
+
+#### Update to a more current GStreamer
+```
+sudo yum install epel-release
+wget http://awel.domblogger.net/7/media/x86_64/awel-media-release-7-6.noarch.rpm
+sudo yum localinstall awel-media-release-7-6.noarch.rpm
+sudo yum clean all
+sudo yum update
+sudo yum install gstreamer1*
+```
+Make sure these are installed (vaapi for Intel GPUs)
+```
+sudo yum install gstreamer1-vaapi
+sudo yum install gstreamer1-libav
+```
+
+#### Installing SDL2
+
+SDL2 is used for joystick support.
+
+```
+sudo yum install SDL2
+sudo yum install SDL2-devel
+```
+
+#### Installing Qt
+
+mkdir ~/devel
+cd ~/devel
+
+Install Qt 5.12.4 from the Qt installation script which can be downloaded [here](https://www.qt.io/download-thank-you?os=linux&hsLang=en). Once downloaded, make it executable and run it:
+```
+chmod +x qt-unified-linux-x64-3.1.1-online.run
+./qt-unified-linux-x64-3.1.1-online.run
+```
+
+Select the following options and install it under ~/devel/Qt
+
+#### Clone and Build QGC
+```
+git clone --recursive https://github.com/mavlink/qgroundcontrol.git
+mkdir build
+cd build
+```
+For a debug/test build:
+```
+../Qt/5.12.4/gcc_64/bin/qmake ../qgroundcontrol/qgroundcontrol.pro -spec linux-g++ CONFIG+=debug
+```
+For a release build:
+```
+../Qt/5.12.4/gcc_64/bin/qmake ../qgroundcontrol/qgroundcontrol.pro spec linux-g++ CONFIG+=qtquickcompiler
+```
+Build it: (use the appropriate number of CPU cores for you machine)
+```
+make -j32
+```
+
+You can alternativelly launch QtCreator (found under `~/devel/Qt/Tools/QtCreator/bin/qtcreator`), load the `qgroundcontro.pro` project and build/debug from within its IDE.
+
+#### Running QGC
+Before launching QGC, you need to make sure the current user has access to the dialout group (serial port access permission):
+```
+sudo usermod -a -G dialout $USER
+```
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