I think your post is not finished. What happens when you configure it like that?

Also, it’s better to ask only one question in one thread – it makes the discussion much easier to follow.

Yes my post is imcomplete, sorry.
When I configure like that, there is no error during build, but can’t find QtMultimedia lib and headers.

Try running the build again (without cleaning the source tree, just using ./build -j <# of cores>), and/ or “make module-qtmultimedia”. It happens for me occasionally with QtDeclarative.

Ok, I will try

It does noit change anything…
There is no special rule to build QtMultimedia with Qt5 ?

Not to my knowledge. Try using git instead of the alpha, maybe the issue was fixed?

Ok, it works from the GIT, thanks ^^

Cheers.