error building the program

[ZYang]

When I was building the program, I got an error like :

**collect2: error: ld returned 1 exit status

examples/CMakeFiles/example.dir/build.make:97: recipe for target 'examples/example' failed
make[2]: *** [examples/example] Error 1
CMakeFiles/Makefile2:729: recipe for target 'examples/CMakeFiles/example.dir/all' failed
make[1]: *** [examples/CMakeFiles/example.dir/all] Error 2
[ 97%] Built target gop
Makefile:116: recipe for target 'all' failed
make: * [all] Error 2

How to resolve my problem?
Thank you very much!