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I'm experiencing a bug when building qt5-base that several others have been able to reproduce. Here is a log of a build which fails. 

The error goes away after installing `icu`. This issue has been discussed in IRC and some logs can be found in the second reply to this issue on Github.

Essentially, we tracked down the error to `tools/uic/main.cpp`, and from there to a couple more files (`driver.h` and `uic.h`). Strangely, the error occurs when using some versions of the package manager we use, but not when manually configuring it (either by directly typing in `./configure -foo -bar -baz` or by executing the build script ourselves - it's strange because our package manager merely execs the build script anyways).

We also noted that Qt has abandoned the ICU project for Qt5, so it's unclear why installing `icu` should reoslve the error.

Tangentially, we uncovered some issues with how qt5-base is being archived - busybox's `tar` implementation fails to preserve dates (not your problem I assume, as libarchive's `tar` seems fine), but the .zip requires us to execute `find . -type f -exec dos2unix {} +` in order to configure it - is the .zip intended as a Windows source?