title: cmake not finding boost linux
body: <p>Im trying to use the program_options library from Boost. However, CMake can and can't find boost... What am I doing wrong?</p>
  
  <p>CMakeLists.txt:</p>
  
  <pre><code>cmake_minimum_required (VERSION 3.8)
  project(myProject)
  set(CMAKE_CXX_STANDARD 14)
  set(CMAKE_CXX_FLAGS "-std=c++0x -g -Wall -O3")
  
  set(CMAKE_CXX_FLAGS_DEBUG "-g")
  
  include_directories ("${PROJECT_BINARY_DIR}")
  
  SET(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "~/Documents/test/myProject/lib/boost_1_65_0")
  SET(CMAKE_BOOST_ROOT ${CMAKE_BOOST_ROOT} "~/Documents/test/myProject/lib/boost_1_65_0")
  #SET(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} "lib/boost_1_65_0/stage/lib")
  include_directories(lib/boost_1_65_0/boost)
  
  FIND_PACKAGE(Boost 1.65.0 COMPONENTS program_options )  
  MESSAGE(${Boost_INCLUDE_DIR})
  
  INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIR})
  
  add_executable (myProject main.cpp)
  
  
  TARGET_LINK_LIBRARIES( myProject LINK_PUBLIC ${Boost_LIBRARIES} -static-libgcc -static-libstdc++ pthread  )
  </code></pre>
  
  <p>FIND_PACKAGE returns:<br>
  -- Could NOT find Boost<br>
  But MESSAGE(${Boost_INCLUDE_DIR}) returns a directory..</p>
  
  <p>Building fails nevertheless.
  As you can see hopefully, I have tried to follow the answer to this related question:
  <a href="https://stackoverflow.com/questions/12179154/undefined-reference-to-boostprogram-optionsoptions-descriptionm-default-l">undefined reference to `boost::program_options::options_description::m_default_line_length&#39;</a> but did not solve the problem.</p>
  
  <p>I'm on Ubuntu 16.04 with cmake 3.11
  and boost located in lib/boost_1_65_0</p>
  
  <p>Edit:
  adding the line 
  set(Boost_DEBUG ON) before find_package() as suggest by Tsyvarev returns the following output:</p>
  
  <pre><code>-- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1121 ] _boost_TEST_VERSIONS = 1.67.0;1.67;1.66.0;1.66;1.65.1;1.65.0;1.65
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1123 ] Boost_USE_MULTITHREADED = TRUE
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1125 ] Boost_USE_STATIC_LIBS = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1127 ] Boost_USE_STATIC_RUNTIME = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1129 ] Boost_ADDITIONAL_VERSIONS = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1131 ] Boost_NO_SYSTEM_PATHS = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1199 ] Declared as CMake or Environmental Variables:
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1201 ]   BOOST_ROOT = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1203 ]   BOOST_INCLUDEDIR = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1205 ]   BOOST_LIBRARYDIR = 
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1207 ] _boost_TEST_VERSIONS = 1.67.0;1.67;1.66.0;1.66;1.65.1;1.65.0;1.65
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1306 ] location of version.hpp: /home/me/Documents/test/myProject/lib/boost_1_65_0/boost/version.hpp
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1330 ] version.hpp reveals boost 1.65.0
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1416 ] guessed _boost_COMPILER = -gcc54
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1426 ] _boost_MULTITHREADED = -mt
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1502 ] _boost_RELEASE_ABI_TAG = -
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1504 ] _boost_DEBUG_ABI_TAG = -d
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1567 ] _boost_LIBRARY_SEARCH_DIRS_RELEASE = /home/me/Documents/test/myProject/lib/boost_1_65_0/lib;/home/me/Documents/test/myProject/lib/boost_1_65_0/../lib;/home/me/Documents/test/myProject/lib/boost_1_65_0/stage/lib;PATHS;C:/boost/lib;C:/boost;/sw/local/lib_boost_LIBRARY_SEARCH_DIRS_DEBUG   = /home/me/Documents/test/myProject/lib/boost_1_65_0/lib;/home/me/Documents/test/myProject/lib/boost_1_65_0/../lib;/home/me/Documents/test/myProject/lib/boost_1_65_0/stage/lib;PATHS;C:/boost/lib;C:/boost;/sw/local/lib
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1756 ] Searching for PROGRAM_OPTIONS_LIBRARY_RELEASE: boost_program_options-gcc54-mt-1_65;boost_program_options-gcc54-mt;boost_program_options-mt-1_65;boost_program_options-mt;boost_program_options
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1809 ] Searching for PROGRAM_OPTIONS_LIBRARY_DEBUG: boost_program_options-gcc54-mt-d-1_65;boost_program_options-gcc54-mt-d;boost_program_options-mt-d-1_65;boost_program_options-mt-d;boost_program_options-mt;boost_program_options
  -- [ /usr/local/share/cmake-3.11/Modules/FindBoost.cmake:1883 ] Boost_FOUND = 1
  -- Could NOT find Boost
  Boost version: 1.65.0
  Boost include path: /home/me/Documents/test/myProject/lib/boost_1_65_0
  Could not find the following Boost libraries:
          boost_program_options
  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.
  /home/me/Documents/test/myProject/lib/boost_1_65_0
  </code></pre>