D22983: Fix build with cmake < 3.7

[Wolfgang Bauer]

This revision was automatically updated to reflect the committed changes.
Closed by commit R36:c81ef41ac6a6: Fix build with cmake < 3.7 (authored by wbauer).

REPOSITORY
  R36 Ark

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D22983?vs=63261&id=63318

REVISION DETAIL
  https://phabricator.kde.org/D22983

AFFECTED FILES
  CMakeLists.txt

To: wbauer, #ark, elvisangelaccio
Cc: dakon, kde-utils-devel, #ark, fbampaloukas, tctara
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