added SoapySDRPlay build info and info for building the soapysdr-support branch itself

SoapySDR-Support-Build.md

@@ -1,4 +1,4 @@
-Building soapysdr-support branch dependencies.
+Building soapysdr-support branch and dependencies.
 ===
 
 Installing SoapySDR for OSX/Linux:
@@ -6,6 +6,7 @@ Installing SoapySDR for OSX/Linux:
 
 SoapySDR itself
 ```
+sudo apt-get install git build-essential automake cmake
 git clone https://github.com/pothosware/SoapySDR.git
 cd SoapySDR
 mkdir build
@@ -20,6 +21,7 @@ SoapySDRUtil --info
 
 SoapyRTLSDR (similar to other Soapy modules):
 ```
+sudo apt-get install librtlsdr-dev
 git clone https://github.com/pothosware/SoapyRTLSDR.git
 cd SoapyRTLSDR
 mkdir build
@@ -31,8 +33,59 @@ sudo ldconfig #only needed on linux systems
 SoapySDRUtil --probe
 ```
 
+SoapySDRPlay (similar to other Soapy modules):
+```
+git clone https://github.com/pothosware/SoapySDRPlay.git
+cd SoapySDRPlay
+mkdir build
+cd build
+cmake .. -DCMAKE_BUILD_TYPE=Release
+make
+sudo make install
+sudo ldconfig #only needed on linux systems
+SoapySDRUtil --probe
+```
+
 - Always ensure to update and build SoapySDR before building dependent projects.
 
+Building soapysdr-support branch of CubicSDR for OSX/Linux:
+---
+
+```
+sudo apt-get install automake libfftw3-dev cmake libgl1-mesa-dev libwxgtk3.0-dev libpulse-dev
+```
+
+If you do not meet the requirements for libgl1-mesa-dev 
+because of one of the following packages:
+libcheese7, libclutter. 
+run the following command:
+
+```
+sudo apt-get install  libglew-dev libcheese7 libcheese-gtk23 libclutter-gst-2.0-0 libcogl15 libclutter-gtk-1.0-0 libclutter-1.0-0  xserver-xorg-input-all
+```
+
+```
+git clone https://github.com/jgaeddert/liquid-dsp
+
+cd liquid-dsp
+./bootstrap.sh
+./configure
+make
+sudo make install
+sudo ldconfig
+cd ..
+
+git clone -b soapysdr-support https://github.com/cjcliffe/CubicSDR.git
+cd CubicSDR
+mkdir build
+cd build
+cmake ../
+make
+cd x64
+./CubicSDR
+```
+
+
 
 Win32/Win64:
 ---