make fail with qt dev error

Hi there,

Trying to compile QjackCtl 0.4.2
on Mint 17 [ubuntu 14.10]

i had some issues when running ./configure, but it ran after i installed qt5 dev pkgs.

but now
make looks like:
make[1]: Entering directory `/home/a/Downloads/qjackctl-0.4.2'
cd src/ && ( test -e Makefile || /usr/lib/x86_64-linux-gnu/qt5/bin/qmake /home/a/Downloads/qjackctl-0.4.2/src/src.pro -o Makefile ) && make -f Makefile
Project ERROR: Unknown module(s) in QT: x11extras
make[1]: *** [sub-src-make_first] Error 3
make[1]: Leaving directory `/home/a/Downloads/qjackctl-0.4.2'
make: *** [src/qjackctl] Error 2

any tips ?
thanks so much