Cmake cannot find boost libraries; but includedir and librarydir are set - c++

Question

I am new to C/C++, Cmake, and Boost; I've read every post in SO of other people having my same problem and I couldn't figure it out.
EDIT: as explained in the comment, I already read another similar post, and I'm already doing what is proposed in the accepted solution (i.e. using COMPONENTS libraryName and set(Boost_USE_STATIC_LIBS OFF). Actually, putting Boost_USE_STATIC_LIBS to OFF removed the "lib" prefix from the libraries name in the argn parameter. And I seem to need that prefix..
I built Boost for Android with bjam and, hoping that I have done everything correctly, I used this command:
./b2 install include=/home/myUser/android-ndk-r12b/sources/cxx-stl/gnu-libstdc++/4.9/include include=/home/myUser/android-ndk-r12b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include include=/home/myUser/android-ndk-r12b/platforms/android-19/arch-arm/usr/include toolset=gcc-arm target-os=android --prefix=/home/myUser/boost_build --with-system --with-random --with-date_time -sNO_BZIP2=1 link=static runtime-link=shared threading=multi
And I end up with this folder structure:
/home/myUser/boost_build/
- include/
-boost/
- # a lot of folders and .hpp files
- lib/
- libboost_date_time.a
- libboost_random.a
- libboost_system.a
Then I launch Cmake in order to compile my project with this command:
cmake -DBOOST_ROOT=/home/myUser/boost_build -DBOOST_INCLUDEDIR=/home/myUser/boost_build/include -DBOOST_LIBRARYDIR=/home/myUser/boost_build/lib -DBOOST_VER:STRING=1.61.0 ./
And this is the revelant part of CMakeList.txt:
option(BUILD_SHARED_LIBS "Build the shared library" OFF)
#option(Boost_USE_STATIC_LIBS "Use Boost static version" ON)
set(Boost_USE_STATIC_LIBS ON)
#tried both of the versions above, I don't even know the difference
set(BOOST_VER "1.61.0")
set(Boost_VERSION 106100)
set(Boost_USE_MULTITHREADED ON)
set(Boost_USE_STATIC_RUNTIME OFF)
set(Boost_FIND_QUIETLY 0 )
set(Boost_DEBUG 1)
find_package(Boost ${BOOST_VER} REQUIRED COMPONENTS system date_time random)
Finally, I end up with this error:
-- [ /usr/share/cmake-3.5/Modules/FindBoost.cmake:1558 ] Boost_FOUND = 1
# e.d.: Notice that Boost_FOUND = 1. Reading through the FindBoost code, I understand that this means that he found the include directory with the header files.
CMake Error at /usr/share/cmake-3.5/Modules/FindBoost.cmake:1719 (message):
# e.d.: don't mind the line numbers in the FindBoost.cmake files... I added a lot of messages around, to debug
Unable to find the requested Boost libraries.
Boost version: 1.61.0
Boost include path: /home/myUser/boost_build/include
Could not find the following static Boost libraries:
boost_system
boost_date_time
boost_random
No Boost libraries were found. You may need to set BOOST_LIBRARYDIR to the
directory containing Boost libraries or BOOST_ROOT to the location of
Boost.
Call Stack (most recent call first):
CMakeLists.txt:48 (find_package)
If I try to print the find_library parameters, in FindBoost.cmake:
message(STATUS "looking for library: var: ${var} , dollarvar: ${${var}}, argn: ${ARGN}")
find_library(${var} ${ARGN})
message(STATUS "dollarvar: ${${var}}" )
I get:
-- looking for library: var: Boost_SYSTEM_LIBRARY_RELEASE , dollarvar: , argn: NAMES;libboost_system-ghs-mt-1_61;libboost_system-ghs-mt;libboost_system-mt-1_61;libboost_system-mt;libboost_system;HINTS;/home/myUser/boost_build/lib;/home/myUser/boost_build/lib;/home/myUser/boost_build/stage/lib;/home/myUser/boost_build/include/lib;/home/myUser/boost_build/include/../lib;/home/myUser/boost_build/include/../lib/;/home/myUser/boost_build/include/stage/lib;PATHS;C:/boost/lib;C:/boost;/sw/local/lib;NAMES_PER_DIR;DOC;Boost system library (release)
-- dollarvar: Boost_SYSTEM_LIBRARY_RELEASE-NOTFOUND
EDIT2: I tried to copypaste my boost_build directory and my project directory from Linux to Windows, where I installed CMake too, and with my great annoyance... cmake under windows worked. Unfortunately cmake under windows generates some Visual Studio Project files, instead of a makefile. Now I'm wondering why cmake version 3.5.1 under Ubuntu 16.04 doesn't work, and cmake version 3.6.2 under Windows 7 does.