threaded-rts

Hi all, I've had a request for --enable-threaded-rts support in the Debian packages, but I don't want to just build with it as then HOpenGL can't be used. My hope was that I could share most files and just have a different binary or something for the threaded-rts (it would be even better if a threaded-rts enabled binary could have it disabled by a +RTS flag, but I don't think this is possible?). However, various .hi, .a files and HSrts.o also seem to differ. So is the best way forward to create two completely separate packages? Thanks Ian