Well I was mistaken, I forgot I had updated GCC to 7.1.0 (and LE doesn't even compile with 7.1.0) with GCC 6.2.0 still doesn't compile, but it is now a different error, I will leave a link to my package.mk in case anyone wants a jab at it.
LibreELEC.tv/package.mk at Sx05RE · shantigilbert/LibreELEC.tv · GitHub
I had to adapt a few patches for it to bypass a few errors on QT 5.9.
Just in case anyone is interested, qt-everywhere now compiles and it works fine, the link is the same.
I can't however make Qt detect gstreamer, even when I do have a package.mk that compiles fine 
I found out that I need to also compile the gstreamer plugins, and those do not compile on Libreelec yet getting an error with libtool.
will probably ask for help on another thread since its not really related to QT.
Niabi, what host Debian or Ubuntu were you able to compile qt-everywhere on?
Niabi, what host Debian or Ubuntu were you able to compile qt-everywhere on?
This is what I used to build qtbase and qtlinguist. It builds for all vanilla LibreELEC projects.
Niabi, what host Debian or Ubuntu were you able to compile qt-everywhere on?
ubuntu
This is what I used to build qtbase and qtlinguist. It builds for all vanilla LibreELEC projects.
Cool! I will try your package 
