Linkoptions not generating pkg-config results

[flamendless]

		linkoptions {
			"`gtk+-3.0 --libs`", 
		}

but in the generated project.ninja it shows

  all_ldflags     =  -L"." `gtk+-3.0 --libs`

instead of the result of running pkg-config --libs gtk+-3.0 which is : -lgtk-3 -lgdk-3 -lz -lpangocairo-1.0 -lpango-1.0 -lharfbuzz -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0