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/usr/lib/x86_64-linux-gnu/cmake/ignition-cmake0/cmake0/FindYAML.cmake is in libignition-cmake-dev 0.4.0-1.

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#===============================================================================
# Copyright (C) 2018 Open Source Robotics Foundation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
########################################
# Find yaml.
#
# Usage of this module as follows:
#
#     find_package(YAML)
#
# Variables defined by this module:
#
#  YAML::YAML              Imported target for libyaml
#
#  YAML_FOUND              System has YAML libs/headers
#  YAML_INCLUDE_DIRS       The location of YAML headers
#  YAML_LIBRARIES          The YAML libraries


if(YAML_FIND_VERSION AND NOT YAML_FIND_VERSION VERSION_EQUAL "0.1")
  message(WARNING "FindYAML only knows how to find version 0.1 "
                  "but you requested version ${YAML_FIND_VERSION}.")
else()
  include(IgnPkgConfig)
  ign_pkg_check_modules(YAML yaml-0.1)

  # If that failed, then fall back to manual detection.
  if(NOT YAML_FOUND)

    if(NOT YAML_FIND_QUIETLY)
      message(STATUS "Attempting manual search for yaml")
    endif()

    find_path(YAML_INCLUDE_DIRS yaml.h ${YAML_INCLUDE_DIRS} ENV CPATH)
    find_library(YAML_LIBRARIES NAMES yaml)
    set(YAML_FOUND true)

    if(NOT YAML_INCLUDE_DIRS)
      if(NOT YAML_FIND_QUIETLY)
        message(STATUS "Looking for yaml headers - not found")
      endif()
      set(YAML_FOUND false)
    endif()

    if(NOT YAML_LIBRARIES)
      if(NOT YAML_FIND_QUIETLY)
        message (STATUS "Looking for yaml library - not found")
      endif()
      set(YAML_FOUND false)
    endif()

    if(YAML_FOUND)
      include(IgnImportTarget)
      ign_import_target(YAML)
    endif()

    include(FindPackageHandleStandardArgs)
    find_package_handle_standard_args(
      YAML
      REQUIRED_VARS YAML_FOUND)
  endif()
endif()