dev-libs/jsoncpp used to have the files /usr/lib64/cmake/jsoncpp/jsoncppConfig.cmake /usr/lib64/cmake/jsoncpp/jsoncppConfig-gentoo.cmake /usr/lib64/cmake/jsoncpp/jsoncppConfigVersion.cmake These are used by third party software for configuration and build. They are no longer installed by dev-libs/jsoncpp-1.9.2-r2, so the configure/build of such software will fail. Reproducible: Always Steps to Reproduce: 1. Update dev-libs/jsoncpp to version 1.9.2-r2 2. Try to build https://github.com/hyle-team/progminer 3. Get the following error: Could not find a package configuration file provided by "jsoncpp" with any of the following names: jsoncppConfig.cmake jsoncpp-config.cmake Add the installation prefix of "jsoncpp" to CMAKE_PREFIX_PATH or set "jsoncpp_DIR" to a directory containing one of the above files. If "jsoncpp" provides a separate development package or SDK, be sure it has been installed.
Upstream switched to meson, so they don't include those files anymore. Progminer's upstream needs to update their CMake code to work with it.