I have no idea if this is the best way to do this (is it really required to compile QT?) but it works for me. This is also reconstructed from the history of a few terminal windows, so it's entirely possible I'm forgetting something.
Start by following the install_linux.txt instructions. You'll need to copy
libida.dylib and libida64.dylib into bin in the SDK root. Additionally,
that bin directory should be in you PATH. Finally make bin/idamake.pl
executable. All of these is covered in the SDK docs.