This bug was fixed in the package qttools-opensource-src - 5.11.1-5ubuntu1
--------------- qttools-opensource-src (5.11.1-5ubuntu1) cosmic; urgency=medium
* Build qdoc with QDOC_PASS_ISYSTEM defined. This is needed because qmake passes Qt include directories as -isystem flags, not as regular -I (LP: #1799111).
-- Dmitry Shachnev <email address hidden> Mon, 26 Nov 2018 11:48:25 +0300
This bug was fixed in the package qttools- opensource- src - 5.11.1-5ubuntu1
--------------- opensource- src (5.11.1-5ubuntu1) cosmic; urgency=medium
qttools-
* Build qdoc with QDOC_PASS_ISYSTEM defined. This is needed because qmake
passes Qt include directories as -isystem flags, not as regular -I (LP:
#1799111).
-- Dmitry Shachnev <email address hidden> Mon, 26 Nov 2018 11:48:25 +0300