Find yaml-cpp before build.

Author: seanyen

Diff for: yaml_cpp_vendor-extras.cmake.in

@@ -1,18 +1,16 @@
-## mjbogusz: find_package() and if() disabled until ament can handle complex paths resolving to /usr/include
-## always use locally built yaml-cpp for now
-# find_package(yaml-cpp QUIET)
+find_package(yaml-cpp 0.6 QUIET)
 
-# if(NOT yaml-cpp_FOUND)
+if(NOT yaml-cpp_FOUND)
   # add the local Modules directory to the modules path
   if(WIN32)
     set(yaml-cpp_DIR "${@PROJECT_NAME@_DIR}/../../../opt/yaml_cpp_vendor/CMake")
   else()
     set(yaml-cpp_DIR "${@PROJECT_NAME@_DIR}/../../../opt/yaml_cpp_vendor/lib/cmake/yaml-cpp")
   endif()
   message(STATUS "Setting yaml-cpp_DIR to: '${yaml-cpp_DIR}'")
-# endif()
 
-find_package(yaml-cpp CONFIG REQUIRED QUIET)
+  find_package(yaml-cpp CONFIG REQUIRED QUIET)
+endif()
 
 set(yaml_cpp_vendor_LIBRARIES ${YAML_CPP_LIBRARIES})
 set(yaml_cpp_vendor_INCLUDE_DIRS ${YAML_CPP_INCLUDE_DIR})