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This is how trying to cross-build the mingw32 Qt4 version of Trojita ends up on CentOS 7:

-- Package Qt4 is required because of REQUIRED
CMake Error at /usr/share/cmake/Modules/FindQt4.cmake:1055 (set_property):
  set_property could not find TARGET Qt4::QAxServer.  Perhaps it has not yet
  been created.
Call Stack (most recent call first):
  cmake/TrojitaOption.cmake:119 (find_package)
  CMakeLists.txt:109 (trojita_find_package)


CMake Error at /usr/share/cmake/Modules/FindQt4.cmake:1058 (set_property):
  set_property could not find TARGET Qt4::QAxServer.  Perhaps it has not yet
  been created.
Call Stack (most recent call first):
  cmake/TrojitaOption.cmake:119 (find_package)
  CMakeLists.txt:109 (trojita_find_package)


Upstream fixed this in commit b8af46cb878551cc5a1c9275f46792b282479ebb as per http://www.cmake.org/Bug/view.php?id=14165:

cmake $ git tag --contains b8af46cb878551cc5a1c9275f46792b282479ebb
v2.8.11.1
v2.8.11.2

Could you please include that patch in your cmake fixes?

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2175.html