undefined reference to `boost::chrono::steady_clock::now()'

[daili0015]

When i :

cmake .. 
make all

I met:

[ 90%] Built target face_swap_image
[ 95%] Linking CXX executable face_swap_batch
/usr/local/lib/libboost_timer.a(cpu_timer.o): In function `boost::timer::cpu_timer::start()':
cpu_timer.cpp:(.text+0x81d): undefined reference to `boost::chrono::steady_clock::now()'
/usr/local/lib/libboost_timer.a(cpu_timer.o): In function `boost::timer::cpu_timer::stop()':
cpu_timer.cpp:(.text+0x945): undefined reference to `boost::chrono::steady_clock::now()'
/usr/local/lib/libboost_timer.a(cpu_timer.o): In function `boost::timer::cpu_timer::elapsed() const':
cpu_timer.cpp:(.text+0xa49): undefined reference to `boost::chrono::steady_clock::now()'
/usr/local/lib/libboost_timer.a(cpu_timer.o): In function `boost::timer::cpu_timer::resume()':
cpu_timer.cpp:(.text+0xb40): undefined reference to `boost::chrono::steady_clock::now()'
/usr/local/lib/libboost_timer.a(cpu_timer.o): In function `boost::timer::auto_cpu_timer::auto_cpu_timer(std::ostream&, short)':
cpu_timer.cpp:(.text+0xc85): undefined reference to `boost::chrono::steady_clock::now()'
/usr/local/lib/libboost_timer.a(cpu_timer.o):cpu_timer.cpp:(.text+0xd2e): more undefined references to `boost::chrono::steady_clock::now()' follow
collect2: error: ld returned 1 exit status
make[2]: *** [face_swap_batch/face_swap_batch] Error 1
make[1]: *** [face_swap_batch/CMakeFiles/face_swap_batch.dir/all] Error 2
make: *** [all] Error 2

There really no appropriate solutions to this , so i come here again.
This is my dir "/usr/local/lib":

There are “libboost_chrono.a” and "libboost_chrono.so" .
So why boost::chrono::steady_clock::now() is undefined? It should be recognized .

[YuvalNirkin]

It is supposed to be linked as a dependency of boost_timer.
Try to force CMake to link it by replacing the following line in the main CMakeLists.txt:

find_package(Boost REQUIRED filesystem program_options regex timer)

with

find_package(Boost REQUIRED filesystem program_options regex timer chrono)

[daili0015]

That's exactly where the problems is!
Thank you once again.