[MonoDevelop] How to fix Monodevelop 6.0 build error with PCL Reference Assemblies not installed on Ubuntu Linux

[Frank Chang]

 We would like to fix today's  Monodevelop 6.0 make error with PCL
Reference Assemblies not installed on Ubuntu Linux 14.04.

We tried to install referenceassemblies-pcl package via sudo apt-get
install referenceassemblies-pcl.
Even after I did that we got the following make error:

/home/frankc/monodevelop/main/Main.sln (default targets) ->
(Build target) ->
/home/venkat/monodevelop/main/external/RefactoringEssentials/RefactoringEssentials/RefactoringEssentials.csproj
(default targets) ->
/opt/mono-2015.12.15+14.05.01/lib/mono/4.5/Microsoft.Common.targets
(GetReferenceAssemblyPaths target) ->

    /opt/mono-2015.12.15+14.05.01/lib/mono/4.5/Microsoft.Common.targets:
error : PCL Reference Assemblies not installed.

     1 Warning(s)
     1 Error(s)

I was told that since PCL != Net4.5 that the installation of
referenceassemblies-pcl was not required for  building monodevelop.

We setup mono prior to the /configure and make steps to: . mono-snapshot
mono/2015.12.15+14.05.01

Please tell us how to fix today's Monodevelop 6.0 build error with PCL
Reference Assemblies not installed on Ubuntu Linux.

Any help is greatly appreciated.
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