recompile with -fPIC

[Dragonbt]

when i run ./build.sh，there is an error
/usr/bin/ld: /usr/local/lib/libyaml-cpp.a(convert.cpp.o): relocation R_X86_64_32 against `.bss' can not be used when making a shared object; recompile with -fPIC
/usr/local/lib/libyaml-cpp.a: error adding symbols: Bad value
collect2: error: ld returned 1 exit status
Frontend/CMakeFiles/OF.dir/build.make:378: recipe for target 'Frontend/libOF.so' failed
make[2]: *** [Frontend/libOF.so] Error 1
CMakeFiles/Makefile2:99: recipe for target 'Frontend/CMakeFiles/OF.dir/all' failed
make[1]: *** [Frontend/CMakeFiles/OF.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

what is going on?
what can i do?

[Dragonbt]

rebuild Yaml with cmake ：cmake -DYAML_BUILD_SHARED_LIBS=ON ..