Fix/opt deps (#62)

* avoid finding deps not enabled during build

* clean up config

Author: nathanhhughes

config_utilities/cmake/config_utilitiesConfig.cmake.in

@@ -5,8 +5,13 @@ get_filename_component(config_utilities_CMAKE_DIR "${CMAKE_CURRENT_LIST_FILE}"
 include(CMakeFindDependencyMacro)
 
 find_dependency(yaml-cpp REQUIRED)
-find_dependency(Eigen3 QUIET)
-find_dependency(glog QUIET)
+if (@Eigen3_FOUND@)  # expanded from Eigen3_FOUND during build time
+  find_dependency(Eigen3)
+endif()
+
+if (@glog_FOUND@)  # expanded from glog_FOUND during build time
+  find_dependency(glog)
+endif()
 
 if(NOT TARGET config_utilities::config_utilities)
   include("${config_utilities_CMAKE_DIR}/config_utilitiesTargets.cmake")