cjdk编译不过？

出现如下情况怎么解决？

root@Ubuntu12_4:/home/OSSC/OSS_C_API# cmake ./
-- The C compiler identification is GNU 4.6.3
-- The CXX compiler identification is GNU 4.6.3
-- 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
-- Check for working CXX compiler: /usr/bin/c  
-- Check for working CXX compiler: /usr/bin/c   -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at CMakeLists.txt:27 (MESSAGE):
  In-tree-compile is not prefered.

-- Configuring incomplete, errors occurred!