'GTK3 e MSYS2 compiling data

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:

$ pkg-config --cflags --libs gtk+-3.0

I got the following error:

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

What's the deal?



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