build error in yaml-cpp

[suphill]

$ sh build.sh
Building 3rdparty/line_descriptor ...
mkdir: cannot create directory ‘build’: File exists
-- Configuring done
-- Generating done
-- Build files have been written to: /home/wangwq/pl-slam-master/3rdparty/line_descriptor/build
[100%] Built target linedesc
Building 3rdparty/DBoW2 ...
mkdir: cannot create directory ‘build’: File exists
-- Build type: Release
-- Configuring done
-- Generating done
-- Build files have been written to: /home/wangwq/pl-slam-master/3rdparty/DBoW2/build
[100%] Built target DBoW2
Uncompressing vocabulary ...
Building PL-SLAM ...
mkdir: cannot create directory ‘build’: File exists
-- Boost version: 1.54.0
-- Found the following Boost libraries:
-- regex
-- thread
-- system
-- filesystem
CMake Error at CMakeLists.txt:43 (FIND_PACKAGE):
Could not find a package configuration file provided by "yaml-cpp" with any
of the following names:

yaml-cppConfig.cmake
yaml-cpp-config.cmake

Add the installation prefix of "yaml-cpp" to CMAKE_PREFIX_PATH or set
"yaml-cpp_DIR" to a directory containing one of the above files. If
"yaml-cpp" provides a separate development package or SDK, be sure it has
been installed.

-- Configuring incomplete, errors occurred!
See also "/home/wangwq/pl-slam-master/build/CMakeFiles/CMakeOutput.log".
make: *** No targets specified and no makefile found. Stop.

CMake Error at CMakeLists.txt:43 (FIND_PACKAGE):
Could not find a package configuration file provided by "yaml-cpp" with any
of the following names:

yaml-cppConfig.cmake
yaml-cpp-config.cmake

how to do?

[suphill]

my os is ubuntu 14.04LTS