message: pkgconfig: Fix support for absolute lib and include dirs
  Using GNUInstallDirs to always have an absolute path regardless of the
  user input:
diff: @@ -273,22 +273,22 @@ endif()
  # .so version
  set_property(TARGET lcf PROPERTY SOVERSION 0)
  +# installation
  +include(GNUInstallDirs)
  +
  # pkg-config file generation
  set(PACKAGE_TARNAME ${PROJECT_NAME})
  set(PACKAGE_VERSION ${PROJECT_VERSION})
  set(prefix "${CMAKE_INSTALL_PREFIX}")
  set(exec_prefix "\${prefix}")
  -set(libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
  -set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
  +set(libdir "${CMAKE_INSTALL_FULL_LIBDIR}")
  +set(includedir "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
  string(REPLACE ";" " " AX_PACKAGE_REQUIRES_PRIVATE "${LIBLCF_DEPS}")
  configure_file(builds/${PROJECT_NAME}.pc.in builds/${PROJECT_NAME}.pc @ONLY)
  # Cmake-config file generation
  configure_file(builds/${PROJECT_NAME}-config.cmake.in builds/${PROJECT_NAME}-config.cmake @ONLY)
  -# installation
  -include(GNUInstallDirs)
  -
  install(
  TARGETS lcf
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
  