Description of problem: Unfortunately there is no jsoncpp in epel6 nor in rhel6. For that reason I cannot build CMake3 on it. :( Please provide a branch / build for el6, too.
Scratch-build of el7-srpm succeded on epel6: https://koji.fedoraproject.org/koji/taskinfo?taskID=13272624
jsoncpp-0.6.0-0.9.rc2.el6 libarchive3-3.1.2-1.el6 has been submitted as an update to Fedora EPEL 6. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a82c466e38
cmake3-3.5.0-2.1.el6, jsoncpp-0.6.0-0.9.rc2.el6, libarchive3-3.1.2-1.el6 has been pushed to the Fedora EPEL 6 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a82c466e38
cmake3-3.5.1-1.el6 jsoncpp-0.6.0-0.9.rc2.el6 libarchive3-3.1.2-1.el6 has been submitted as an update to Fedora EPEL 6. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a82c466e38
cmake3-3.5.1-1.el6, jsoncpp-0.10.5-1.el6, libarchive3-3.1.2-1.el6 has been pushed to the Fedora EPEL 6 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2016-a82c466e38
cmake3-3.5.1-1.el6, jsoncpp-0.10.5-1.el6, libarchive3-3.1.2-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.