Build failed on Linux Ubuntu

[jurajsomorovsky]

As discussed...report:

Errors:

/home/juraj/programs/mitls-flex/VS/miTLS.sln (default targets) ->
(Build target) ->
/home/juraj/programs/mitls-flex/libs/DB/DB.fsproj (default targets) ->

/home/juraj/programs/mitls-flex/libs/DB/DB.fsproj: error : Target named 'Build' not found in the project.

/home/juraj/programs/mitls-flex/VS/miTLS.sln (default targets) ->
(Build target) ->
/home/juraj/programs/mitls-flex/libs/Platform/Platform.fsproj (default targets) ->

/home/juraj/programs/mitls-flex/libs/Platform/Platform.fsproj: error : Target named 'Build' not found in the project.

Mono JIT compiler version 3.2.8 (Debian 3.2.8+dfsg-4ubuntu4)

[pfasante]

did you install all of the prerequisites?
I'm also not able to install it on xubuntu-xenial, but I get another error (which is later in the make phase, I guess):

% make
xbuild /nologo /p:Configuration=Release VS/miTLS.sln

Build started 7/8/2016 9:57:27 AM.
[...]
Errors:

/home/asante/werkstatt/werkbank/mitls-flex/VS/miTLS.sln (default targets) ->
(Build target) ->
/home/asante/werkstatt/werkbank/mitls-flex/libs/OpenSSL/OpenSSL.csproj (default targets) ->
/usr/lib/mono/4.5/Microsoft.CSharp.targets (CoreCompile target) ->

CSC: error CS0518: The predefined type System.Object is not defined or imported
[...]
CSC: error CS0518: The predefined type System.Exception is not defined or imported

2 Warning(s)
31 Error(s)

Time Elapsed 00:00:07.0791400
Makefile:26: recipe for target 'build' failed

Haven't yet found out, what I am missing, the complete make output is: make-log.txt.
What I've done:

• git clone git@github.com:mitls/mitls-flex.git
• sudo apt install mono-complete mono-xbuild fsharp nuget
• cd mitls-flex/VS && nuget restore && cd ..
• make

[markulf]

Is it related to differing runtime versions. Have a look at

http://stackoverflow.com/questions/10490155/unable-to-run-net-app-with-mono-mscorlib-dll-not-found-version-mismatch
http://superuser.com/questions/743863/debian-unable-to-use-mono-missing-mscorlib-dll?

This may fix the immediate problem, but won't be a long-term solution. We should adapt the README.

[pfasante]

that's right. adding /p:TargetFrameworkVersion="v4.5" to the build variable in the Makefile fixed it for me (based on this so answer: https://stackoverflow.com/questions/27594393/compiled-mono-missing-default-net-libraries-system-object-is-not-defined-or-i/27855445#27855445 ).