Debian runs mono error CS8027: Error starting pkg-config

I'm on debian. I did sudo apt-get install mono-complete

I am trying to compile this program

user@debian:~$ cat a2.cs
using Gtk;
using System;

class Hello {

        static void Main()
        {
                Application.Init ();

                Window window = new Window ("helloworld");
                window.Show();

                Application.Run ();

        }
}

Then, when I try to compile it, I get this error

user@debian:~$ mcs a2.cs -pkg:gtk-sharp-2.0
Package gtk-sharp-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk-sharp-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk-sharp-2.0' found
error CS8027: Error running pkg-config. Check the above output.
user@debian:~$ 

one answer to a similar problem said try dmcs

user@debian:~$ dmcs a2.cs -pkg:gtk-sharp-2.0
Package gtk-sharp-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk-sharp-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk-sharp-2.0' found
error CS8027: Error running pkg-config. Check the above output.
user@debian:~$ 

but dmcs gives the same error

I saw a suggestion to make yum install gtk-sharp2, but any spell I use says the package is not available, so I'm not sure if this package

user@debian:~$ sudo yum install gtk-sharp-2.0
Setting up Install Process
No package gtk-sharp-2.0 available.
Nothing to do
user@debian:~$ 

user@debian:~$ sudo yum install gtk-sharp2-devel
Setting up Install Process
No package gtk-sharp2-devel available.
Nothing to do
user@debian:~$ 

I was looking for my error https://stackoverflow.com/search?q=cs8027 and they all say that this PKG_CONFIG_PATH variable should point to the correct path.

, , . -, .pc gtk. , .

user@debian:/usr$ echo $PKG_CONFIG_PATH

user@debian:/usr$
+4
1

, debian, yum? .

:

sudo apt-get update
sudo apt-get install gtk-sharp2

:

make clean

.

, barlop

, problem: 0:System.Drawing.SizeF.Conversion, with xpath: /Type/Members/Member[@MemberName='op_Conversion']/Docs, , , , .

, apt-get, , , , , . , .

/usr/lib/pkgconfig/gtk-sharp-2.0.pc ,

$ dmcs a2.cs -pkg:gtk-sharp-2.0 < -

+4

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