The files jsoncppConfig*.cmake are not installed anymore by 1.9.3_pre20200412 and 1.9.2-r2. 1.9.1 and 1.9.2-r1 install it. Reproducible: Always -DJSONCPP_WITH_CMAKE_PACKAGE=ON was dropped from mycmakeargs in the ebuild, but on the other hand JSONCPP_WITH_CMAKE_PACKAGE (<https://github.com/open-source-parsers/jsoncpp/blob/1.9.2/CMakeLists.txt#L207>) defaults to “ON” (<https://github.com/open-source-parsers/jsoncpp/blob/1.9.2/CMakeLists.txt#L84>).
*** This bug has been marked as a duplicate of bug 708256 ***
Created attachment 635632 [details] jsoncpp-1.9.2-r2.ebuild The attached ebuild uses cmake for the installation of jsoncpp (which is still supported by upstream btw.). During the installation the required cmake files are genrated. Just place this ebuild in your local overlay.