Is your feature request related to a problem? Please describe.
log4cpp project doesn't export *Config.cmake or *-config.cmake file. log4cpp not support find_find_package(log4cpp CONFIG REQUIRED) in CMakeLists.txt as sqlite3 find_package(unofficial-sqlite3 CONFIG REQUIRED) does.

Proposed solution

• add a patch for export targets
• add log4cpp-config.cmake file for include targets.