Update INSTALL.md

INSTALL.md

@@ -14,6 +14,9 @@ sudo apt-get install libqt5multimedia5-plugins
 sudo apt-get install qtmultimedia5-dev
 sudo apt-get install git 
 sudo apt-get install libopus-dev
+sudo apt-get install libeigen3-dev
+sudo apt-get install portaudio19-dev
+sudo apt-get install librtaudio-dev
 ~~~
 Now you need to install qcustomplot. There are two versions that are commonly found in linux distros: 1.3 and 2.0. Either will work fine. If you are not sure which version your linux install comes with, simply run both commands. One will work and the other will fail, and that's fine!