So, I've had G++ setup on my (Windows) PC and I've been learning to write in C++ for quite a while now, so I've decided to venture into GUI's. I've been attempting to install Gtk+ for a day now, and quite frankly, I'm frustrated. I get the same error every single time I run "pkg-config --cflags gtk+-3.0": 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 No package 'gtk+-3.0' found The "bin" directory is in my $PATH, so I don't quite understand. Anyone here have the same issue (or better yet, a solution)?