[ENH] Added outputs with include directories of external dependencies.

CMakeLists.txt

@@ -167,12 +167,14 @@ if(NOT EXPRTK_FOUND AND ALLOW_DEPENDENCIES_DOWNLOAD)
     message("Exprt will be downloaded and compiled locally in 'external_dependencies' folder.")
     include(DownloadExprtk)
 endif()
+message(STATUS EXPRTK_INCLUDE_DIRS: ${EXPRTK_INCLUDE_DIRS})
 
 find_package(Turtle)
 if(NOT TURTLE_FOUND AND ALLOW_DEPENDENCIES_DOWNLOAD)
     message("Turtle will be downloaded and compiled locally in 'external_dependencies' folder.")
     include(DownloadTurtle)
 endif()
+message(STATUS TURTLE_INCLUDE_DIRS: ${TURTLE_INCLUDE_DIRS})
 
 find_package(Armadillo)
 if(NOT ARMADILLO_FOUND AND ALLOW_DEPENDENCIES_DOWNLOAD)