Error in building example

[xingxu21]

Upon running cmake .. I received the following issue:

`-- The C compiler identification is GNU 5.4.0 -- The CXX compiler identification is unknown -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done CMake Error at CMakeLists.txt:2 (project): No CMAKE_CXX_COMPILER could be found.

Tell CMake where to find the compiler by setting either the environment variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path to the compiler, or to the compiler name if it is in the PATH.

-- Configuring incomplete, errors occurred! See also "/home/xingxu/cpr-example/build/CMakeFiles/CMakeOutput.log". See also "/home/xingxu/cpr-example/build/CMakeFiles/CMakeError.log".`

I'm running this under linux.