mkdir build
cd build
cmake ../
make

$ make
Scanning dependencies of target colib_static
[  3%] Building CXX object CMakeFiles/colib_static.dir/co_epoll.cpp.o
[  6%] Building CXX object CMakeFiles/colib_static.dir/co_hook_sys_call.cpp.o
[ 10%] Building CXX object CMakeFiles/colib_static.dir/co_routine.cpp.o
[ 13%] Building CXX object CMakeFiles/colib_static.dir/coctx.cpp.o
[ 16%] Building ASM object CMakeFiles/colib_static.dir/coctx_swap.S.o
[ 20%] Linking CXX static library libcolib.a
[ 20%] Built target colib_static
Scanning dependencies of target example_thread
[ 23%] Building CXX object CMakeFiles/example_thread.dir/example_thread.cpp.o
[ 26%] Linking CXX executable example_thread
[ 26%] Built target example_thread
Scanning dependencies of target example_setenv
[ 30%] Building CXX object CMakeFiles/example_setenv.dir/example_setenv.cpp.o
[ 33%] Linking CXX executable example_setenv
libcolib.a(co_hook_sys_call.cpp.o): In function `co_gethostbyname_r(char const*, hostent*, char*, unsigned long, hostent**, int*)':
co_hook_sys_call.cpp:(.text+0x1fca): undefined reference to `clsCoMutex::clsCoMutex()'
libcolib.a(co_hook_sys_call.cpp.o): In function `clsSmartLock::clsSmartLock(clsCoMutex*)':
co_hook_sys_call.cpp:(.text._ZN12clsSmartLockC2EP10clsCoMutex[_ZN12clsSmartLockC5EP10clsCoMutex]+0x26): undefined reference to `clsCoMutex::CoLock()'
libcolib.a(co_hook_sys_call.cpp.o): In function `clsSmartLock::~clsSmartLock()':
co_hook_sys_call.cpp:(.text._ZN12clsSmartLockD2Ev[_ZN12clsSmartLockD5Ev]+0x17): undefined reference to `clsCoMutex::CoUnLock()'
collect2: error: ld returned 1 exit status
CMakeFiles/example_setenv.dir/build.make:95: recipe for target 'example_setenv' failed
make[2]: *** [example_setenv] Error 1
CMakeFiles/Makefile2:104: recipe for target 'CMakeFiles/example_setenv.dir/all' failed
make[1]: *** [CMakeFiles/example_setenv.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2