title: GTK3 e MSYS2 compiling data
body: <p>i've installed in my windows 10 system GTK3.0 for mingw64 by MSYS2 but i've got a problem with pkg-config. When i write in the shell:</p>
  <pre><code>$ pkg-config --cflags --libs gtk+-3.0
  </code></pre>
  <p>I got the following error:</p>
  <pre><code>Package gtk+-3.0 was not found in the pkg-config search path.
  Perhaps you should add the directory containing `gtk+-3.0.pc'
  to the PKG_CONFIG_PATH environment variable
  Package 'gtk+-3.0', required by 'virtual:world', not found
  </code></pre>
  <p>What's the deal?</p>