/usr/lib/x86_64-linux-gnu/qt5/mkspecs/features/maliit-plugins.prf is in maliit-framework-dev 0.99.0+git20130615+97e8335-0ubuntu8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | LIBS *= -L/usr/lib -lmaliit-plugins
INCLUDEPATH *= /usr/include/maliit/plugins
CONFIG *= maliit-framework
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