mono compile fail, for unity3d

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What steps will reproduce the problem?
1.

~/BuildSrc/protobuf-csharp-port-2.4.1.521/mono$ ./buildall.sh
Building main library
../src/ProtocolBuffers/GeneratedMessage.cs(55,26): error CS0314: The type 
`TBuilder' cannot be used as type parameter `TBuilder' in the generic type or 
method `Google.ProtocolBuffers.GeneratedBuilder<TMessage,TBuilder>'. There is 
no boxing or type parameter conversion from `TBuilder' to 
`Google.ProtocolBuffers.GeneratedBuilder<TMessage,TBuilder>'
../src/ProtocolBuffers/GeneratedBuilder.cs(50,35): (Location of the symbol 
related to previous error)
../src/ProtocolBuffers/GeneratedMessage.cs(55,26): error CS0310: The type 
`TBuilder' must have a public parameterless constructor in order to use it as 
parameter `TBuilder' in the generic type or method 
`Google.ProtocolBuffers.GeneratedBuilder<TMessage,TBuilder>'
../src/ProtocolBuffers/CustomSerialization.cs(161,19): (Location of the symbol 
related to previous error)
../src/ProtocolBuffers/ExtendableMessage.cs(45,26): error CS0314: The type 
`TMessage' cannot be used as type parameter `TMessage' in the generic type or 
method `Google.ProtocolBuffers.GeneratedMessage<TMessage,TBuilder>'. There is 
no boxing or type parameter conversion from `TMessage' to 
`Google.ProtocolBuffers.GeneratedMessage<TMessage,TBuilder>'
../src/ProtocolBuffers/CustomSerialization.cs(161,19): (Location of the symbol 
related to previous error)
../src/ProtocolBuffers/ExtendableMessage.cs(46,26): error CS0314: The type 
`TBuilder' cannot be used as type parameter `TBuilder' in the generic type or 
method `Google.ProtocolBuffers.GeneratedBuilder<TMessage,TBuilder>'. There is 
no boxing or type parameter conversion from `TBuilder' to 
`Google.ProtocolBuffers.GeneratedBuilder<TMessage,TBuilder>'
../src/ProtocolBuffers/GeneratedBuilder.cs(50,35): (Location of the symbol 
related to previous error)
../src/ProtocolBuffers/ExtendableMessage.cs(46,26): error CS0310: The type 
`TBuilder' must have a public parameterless constructor in order to use it as 
parameter `TBuilder' in the generic type or method 
`Google.ProtocolBuffers.GeneratedBuilder<TMessage,TBuilder>'
../src/ProtocolBuffers/CustomSerialization.cs(164,19): (Location of the symbol 
related to previous error)
../src/ProtocolBuffers/GeneratedBuilderLite.cs(48,26): error CS0314: The type 
`TMessage' cannot be used as type parameter `TMessage' in the generic type or 
method `Google.ProtocolBuffers.GeneratedMessageLite<TMessage,TBuilder>'. There 
is no boxing or type parameter conversion from `TMessage' to 
`Google.ProtocolBuffers.GeneratedMessageLite<TMessage,TBuilder>'
../src/ProtocolBuffers/GeneratedMessageLite.cs(50,35): (Location of the symbol 
related to previous error)
Compilation failed: 6 error(s), 0 warnings
Building main library tests
error CS0006: Metadata file `bin/Google.ProtocolBuffers.dll' could not be found
Compilation failed: 1 error(s), 0 warnings
Running main library tests
NUnit version 2.5.0.9122 ()
Copyright (C) 2002-2008 Charlie Poole.\r\nCopyright (C) 2002-2004 James W. 
Newkirk, Michael C. Two, Alexei A. Vorontsov.\r\nCopyright (C) 2000-2002 Philip 
Craig.\r\nAll Rights Reserved.

Runtime Environment - 
   OS Version: Unix 3.11.0.17
  CLR Version: 2.0.50727.1433 ( 2.10.8.1 (Debian 2.10.8.1-5ubuntu2) )

ProcessModel: Default    DomainUsage: Single
Execution Runtime: mono-2.0.50727.1433
Could not load file or assembly 
'/home/pingfan/BuildSrc/protobuf-csharp-port-2.4.1.521/mono/bin/Google.ProtocolB
uffers.Test.dll' or one of its dependencies. The system cannot find the file 
specified.
Building ProtoGen
error CS0006: Metadata file `bin/Google.ProtocolBuffers.dll' could not be found
Compilation failed: 1 error(s), 0 warnings
Building ProtoGen tests
error CS0006: Metadata file `bin/Google.ProtocolBuffers.dll' could not be found
error CS0006: Metadata file `bin/ProtoGen.exe' could not be found
Compilation failed: 2 error(s), 0 warnings
Running ProtoGen tests
NUnit version 2.5.0.9122 ()
Copyright (C) 2002-2008 Charlie Poole.\r\nCopyright (C) 2002-2004 James W. 
Newkirk, Michael C. Two, Alexei A. Vorontsov.\r\nCopyright (C) 2000-2002 Philip 
Craig.\r\nAll Rights Reserved.

Runtime Environment - 
   OS Version: Unix 3.11.0.17
  CLR Version: 2.0.50727.1433 ( 2.10.8.1 (Debian 2.10.8.1-5ubuntu2) )

ProcessModel: Default    DomainUsage: Single
Execution Runtime: mono-2.0.50727.1433
Could not load file or assembly 
'/home/pingfan/BuildSrc/protobuf-csharp-port-2.4.1.521/mono/bin/Google.ProtocolB
uffers.ProtoGen.Test.dll' or one of its dependencies. The system cannot find 
the file specified.

What is the expected output? What do you see instead?


What version of the product are you using? On what operating system?

protobuf-csharp-port-2.4.1.521

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 24 Mar 2014 at 8:50