Qt Creator has submodules, but none of them are checked out when getting the repository sources via COIN.
Gitmodules file:
[submodule "qbs"]
        path = src/shared/qbs
        url = ../../qbs/qbs.git
        ignore = dirty
[submodule "perfparser"]
        path = src/tools/perfparser
        url = ../perfparser.git
        ignore = dirty
[submodule "litehtml"]
        path = src/plugins/help/qlitehtml/litehtml
        url = https://github.com/litehtml/litehtml.git