The xbuild command does not build. Why?

Question

linux

I'm trying to put Scallion to search hashes for onion in order to mine the addresses I need. I downloaded the xbuild-mono package, I execute the xbuild scallion.sln command
In response to this:

XBuild Engine Version 14.0
Mono, Version 4.6.1.0
Copyright (C) 2005-2013 Various Mono authors

Build started 29.12.2016 1:33:07.
__________________________________________________
Project "/root/Загрузки/scallion-gpg/scallion.sln" (default target(s)):
  Target ValidateSolutionConfiguration:
    Building solution configuration "Debug|Any CPU".
  Target Build:
    Project "/root/Загрузки/scallion-gpg/opentk/Source/OpenTK/OpenTK.csproj" (default target(s)):
      Target PrepareForBuild:
        Configuration: Debug Platform: AnyCPU
      Target ResolveAssemblyReferences:
/usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets:  warning : Reference 'System.Drawing' not resolved
        For searchpath {CandidateAssemblyFiles}
        Warning: {CandidateAssemblyFiles} not supported currently
        For searchpath {HintPathFromItem}
        HintPath attribute not found
        For searchpath {TargetFrameworkDirectory}
        For searchpath {PkgConfig}
        Considered System.Drawing, but could not find in any pkg-config files.
        For searchpath {GAC}
        Considered System.Drawing, but could not find in the GAC.
        For searchpath {RawFileName}
        Considered 'System.Drawing' as a file, but the file does not exist
        For searchpath ../../Binaries/OpenTK/Debug/
        Considered '/root/Загрузки/scallion-gpg/opentk/Binaries/OpenTK/Debug/System.Drawing' as a file, but the file does not exist
        Considered '/root/Загрузки/scallion-gpg/opentk/Binaries/OpenTK/Debug/System.Drawing.exe' as a file, but the file does not exist
        Considered '/root/Загрузки/scallion-gpg/opentk/Binaries/OpenTK/Debug/System.Drawing.dll' as a file, but the file does not exist
    Done building project "/root/Загрузки/scallion-gpg/opentk/Source/OpenTK/OpenTK.csproj".-- FAILED
    Project "/root/Загрузки/scallion-gpg/openssl-net-0.5/ManagedOpenSsl/openssl.csproj" (default target(s)):
      Target PrepareForBuild:
        Configuration: Debug Platform: AnyCPU
      Target ResolveAssemblyReferences:
/usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets:  warning : Reference 'System.Data.DataSetExtensions' not resolved
        For searchpath {CandidateAssemblyFiles}
        Warning: {CandidateAssemblyFiles} not supported currently
        For searchpath {HintPathFromItem}
        HintPath attribute not found
        For searchpath {TargetFrameworkDirectory}
        For searchpath {PkgConfig}
        Considered System.Data.DataSetExtensions, but could not find in any pkg-config files.
        For searchpath {GAC}
        Considered System.Data.DataSetExtensions, but could not find in the GAC.
        For searchpath {RawFileName}
        Considered 'System.Data.DataSetExtensions' as a file, but the file does not exist
        For searchpath bin/Debug/
        Considered '/root/Загрузки/scallion-gpg/openssl-net-0.5/ManagedOpenSsl/bin/Debug/System.Data.DataSetExtensions' as a file, but the file does not exist
        Considered '/root/Загрузки/scallion-gpg/openssl-net-0.5/ManagedOpenSsl/bin/Debug/System.Data.DataSetExtensions.exe' as a file, but the file does not exist
        Considered '/root/Загрузки/scallion-gpg/openssl-net-0.5/ManagedOpenSsl/bin/Debug/System.Data.DataSetExtensions.dll' as a file, but the file does not exist
      Target GenerateSatelliteAssemblies:
      No input files were specified for target GenerateSatelliteAssemblies, skipping.
    Done building project "/root/Загрузки/scallion-gpg/openssl-net-0.5/ManagedOpenSsl/openssl.csproj".-- FAILED
  Task "MSBuild" execution -- FAILED
  Done building target "Build" in project "/root/Загрузки/scallion-gpg/scallion.sln".-- FAILED
Done building project "/root/Загрузки/scallion-gpg/scallion.sln".-- FAILED

Build FAILED.

Warnings:

/root/Загрузки/scallion-gpg/scallion.sln (default targets) ->
(Build target) ->
/root/Загрузки/scallion-gpg/opentk/Source/OpenTK/OpenTK.csproj (default targets) ->
/usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets (ResolveAssemblyReferences target) ->

  /usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets:  warning : Reference 'System.Drawing' not resolved

/root/Загрузки/scallion-gpg/scallion.sln (default targets) ->
(Build target) ->
/root/Загрузки/scallion-gpg/openssl-net-0.5/ManagedOpenSsl/openssl.csproj (default targets) ->
/usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets (ResolveAssemblyReferences target) ->

  /usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets:  warning : Reference 'System.Data.DataSetExtensions' not resolved

   2 Warning(s)
   0 Error(s)

Time Elapsed 00:00:00.7035090

As I understand it, two errors come out here:
/usr/lib/mono/xbuild/14.0/bin/Microsoft.Common.targets: warning : Reference 'System.Drawing' not resolved
and
/usr/lib/mono/xbuild/14.0/bin /Microsoft.Common.targets: warning : Reference 'System.Data.DataSetExtensions' not resolved
What should I do?