我目前正在尝试编译qtpim库。我使用以下命令这样做：
$ git clone git://code.qt.io/qt/qtpim.git
Cloning into 'qtpim'...
remote: Counting objects: 25257, done.
remote: Compressing objects: 100% (8419/8419), done.
remote: Total 25257 (delta 19142), reused 21557 (delta 16688)
Receiving objects: 100% (25257/25257), 14.96 MiB | 435.00 KiB/s, done.
Resolving deltas: 100% (19142/19142), done.
Checking connectivity... done.
$ cd qtpim/
$ git checkout v5.0.0-beta1
Note: checking out 'v5.0.0-beta1'.
You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.
If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:
git checkout -b <new-branch-name>
HEAD is now at a869b9a... Removed one un-used file.
$ qmake
Info: creating cache file $HOME/git/qtpim/.qmake.cache
$ 制作
Makefile:619: warning: overriding recipe for target 'docs'
Makefile:610: warning: ignoring old recipe for target 'docs'
cd src/ && ( test -e Makefile || /usr/lib/qt/bin/qmake $HOME/git/qtpim/src/src.pro -o Makefile ) && make -f Makefile
make[1]: Entering directory '$HOME/git/qtpim/src'
cd contacts/ && ( test -e Makefile || /usr/lib/qt/bin/qmake $HOME/git/qtpim/src/contacts/contacts.pro -o Makefile ) && make -f Makefile
Project ERROR: Module does not define version.
Makefile:47: recipe for target 'sub-contacts-make_first-ordered' failed
make[1]: *** [sub-contacts-make_first-ordered] Error 3
make[1]: Leaving directory '$HOME/git/qtpim/src'
Makefile:44: recipe for target 'sub-src-make_first' failed
make: *** [sub-src-make_first] Error 2
糟糕的是，文件树中没有 README 或 INSTALL 文件或任何其他文件。为了让 qmake 编译这个库，我错过了什么？