Ill test it and tell you, but it will have to be tomorrow . I use computers that have 2.40 (jessie) and also 2.48 (stretch), so I can try both versions.

By the way i was replying an older version of your poast (before you succeded to build it), and so, i will copy here what i modified in the makefile. I used NATIVE=false and UISTYLE=text
Did you have to do the same (i mean about NATIVE). I will also read your spec to see what I was doing wrong while trying to produce a rpm
package.