Comment 1 for bug 282338

Fink users have reported this same error. It started happening when gtk+ was upgraded from 2.12.x to 2.14.x. Apparently older versions of gtk+ published "-lX11" via pkg-config; recent gtk+ no longer publishes that flag (sensibly...it's not required for "things using gtk+" to link against libX11 themselves). Looks like inkscape itself uses libX11 directly, so needs to pass its own explicit linker flag for it.