[Boost-build] I am new to Boost and I have an error !

Subject: [Boost-build] I am new to Boost and I have an error !
From: MAURICE Jean - externe (jean-externe.maurice_at_[hidden])
Date: 2016-08-26 09:59:59

I apologize : english is not my natural langage.

I have been hired to modify a very big app that seems to be very complicated. It's my second day of work here !

After copying the source files on my brand new computer, I try to build the app. Building all the libraries (including Boost) seems ok but the final build return an error :

g++ -W -Wall -fPIC -I ./ -I ../sources/include -I ../../kheopsToolBox/sources/include/  ......  -I ../../Libraries/Linux/Boost/include -D NDEBUG -O2 -o ../../build/linux/kheopslauncher/Tests/Binary/Release/LauncherTest ../... ../../Libraries/Linux/Boost/lib  -lkheopsdataaccess ...-lboost_program_options -lboost_system -lboost_filesystem -lboost_date_time -lboost_regex -lboost_thread
/usr/bin/ld: warning: libboost_chrono.so.1.50.0, needed by ../../Libraries/Linux/Boost/lib/libboost_thread.so, not found (try using -rpath or -rpath-link)
../../build/linux/kheopsdataaccess/Binary/Release/libkheopsdataaccess.so: référence indéfinie vers « boost::filesystem::detail::copy_file(boost::filesystem::path const&, boost::filesystem::path const&, boost::filesystem::copy_option::enum_type, boost::system::error_code*) »
collect2: error: ld returned 1 exit status

first is the warning "libboost_chrono.so.1.50.0 not found" important ?

second about "undefined reference to  « boost::filesystem::detail::copy_file ...", I read on internet that we have to write
#define BOOST_NO_CXX11_SCOPED_ENUMS
#include <boost/filesystem.hpp>
#undef BOOST_NO_CXX11_SCOPED_ENUMS
in some .h files. I did it but with no success.

Can you give me the first steps towards the solution ?

TIA
Jean in France

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