Missing "Unix" inside of "Mono"

Hi, all,

I want to install Pinta.

http://www.pinta-project.com/

However, I cannot do it from Ubuntu's repos, since that would mean to
install Ubuntu's packages instead of Xamarin's:

===
$ sudo apt-get install Pinta
[sudo] password for baltasarq:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 pinta : Depends: libmono-posix2.0-cil (>= 3.2.3) but it is not going to be
installed
E: Unable to correct problems, you have held broken packages.
===

Okay, so I downloaded the tarball from their web and tried to install from
source. However, it complains about missing namespace "Unix" inside of
"Mono" (23 errors). What Xamarin packages am I missing?

===
Actions/WindowActions.cs(30,12): error CS0234: The type or namespace name
`Unix' does not exist in the namespace `Mono'. Are you missing an assembly
reference?
===

-- baltasar

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