不知道你的 MSYS2 环境怎么了？
我的结果是这样的：
$ pkg-config --cflags gtk+-win32-3.0
-pthread -mms-bitfields -ID:/Developer/msys64/mingw64/include/gtk-3.0 -ID:/Developer/msys64/mingw64/include/cairo -ID:/Developer/msys64/mingw64/include -ID:/Developer/msys64/mingw64/include/pango-1.0 -ID:/Developer/msys64/mingw64/include/fribidi -ID:/Developer/msys64/mingw64/include -ID:/Developer/msys64/mingw64/include/atk-1.0 -ID:/Developer/msys64/mingw64/include/cairo -ID:/Developer/msys64/mingw64/include/pixman-1 -ID:/Developer/msys64/mingw64/include -ID:/Developer/msys64/mingw64/include/freetype2 -ID:/Developer/msys64/mingw64/include -ID:/Developer/msys64/mingw64/include/harfbuzz -ID:/Developer/msys64/mingw64/include -ID:/Developer/msys64/mingw64/include/libpng16 -ID:/Developer/msys64/mingw64/include/gdk-pixbuf-2.0 -ID:/Developer/msys64/mingw64/include -ID:/Developer/msys64/mingw64/include/glib-2.0 -ID:/Developer/msys64/mingw64/lib/glib-2.0/include -ID:/Developer/msys64/mingw64/include
【 在 soncyme 的大作中提到: 】
: https://www.gtk.org/docs/installations/windows/
: 按这个网页上面，msys2的步骤安装的
: 只是把步骤4涉及python的跳过了
: ...................
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