Best practice to create a Qt4 and a Qt5 version of the same source.

[Stefan Ahlers]

Hello,

I want to create Qt5 builds of some libraries. For example "liblastfm"
(Qt4) and "liblastfm5" (Qt5). Is it allow to create a separate package
for Qt5 or do I have to modify the Qt4 package?

If I have to modify the Qt4 package, how can do it?

Best regards,
Stefan Ahlers