The license for gtksourcecompletion is LGPL 2.1 or above, but the included COPYING file is for LGPL 3. Could this be fixed in the next release?
If the license is indeed changing to LGPL 3 or above, then
- the headers in the source files need to be updated, and
- the license text for GPLv3 need to be included as well (e.g. as COPYING and COPYING.LIB, or COPYING and COPYING.LESSER, for GPL...