feat(slam): add cartographer_ros

cartographer/cmake/modules/FindSphinx.cmake

@@ -0,0 +1,24 @@
+# Copyright 2016 The Cartographer Authors
+#
+# 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.
+
+# TODO(hrapp): Replace through the one of ceres
+
+find_program(SPHINX_EXECUTABLE
+             NAMES sphinx-build
+             PATHS
+               /usr/bin
+             DOC "Sphinx")
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Sphinx DEFAULT_MSG SPHINX_EXECUTABLE)