Compilation error on Ubuntu 16.04 (gcc 5.4, qmake 5.13)#6

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djvine wants to merge 1 commit intoqtepics:masterfrom

Commits on Sep 12, 2019

Had to make this change to compile on Ubuntu 16.04 with gcc 5.4 and qmake 5.13.
David J. Vine
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