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C:\path>set PKG_CONFIG_PATH=C:\msys64\mingw64\lib\pkgconfig ... C:\path>\msys64\mingw64\bin\pkg-config.exe --libs glib-2.0 -LC:/msys64/mingw64/lib -lglib-2.0 -lintl
$ pkg-config --libs glib-2.0 -lglib-2.0 -lintl