Linking issue with libyaml

[yongluoFlex]

[按照指导文档装完依赖库，但是编译报]

[gc87]

The libyaml dependency will be removed, as a temporary solution you can refer to #476 and #477 .

[gc87]

$ git clone -b 0.2.5 https://github.com/yaml/libyaml.git
$ cd libyaml && mkdir build && cd build 
$ cmake -DBUILD_SHARED_LIBS=OFF -DCMAKE_POSITION_INDEPENDENT_CODE=ON .. && make
$ sudo make install