Boost include headers not found using cmake

This question is very similar to Why is this boost header file not included, however the hints there don't (seem to) solve my problem.

I got a CMakeLists.txt

CMAKE_MINIMUM_REQUI开发者_高级运维RED(VERSION 2.8)
PROJECT(jetorigin)

SET(Boost_ADDITIONAL_VERSIONS "1.43" "1.43.0" "1.44" "1.44.0" "1.45" "1.45.0")
SET(BOOST_ROOT "$ENV{HOME}/usr")
MESSAGE(STATUS "** Search Boost root: ${BOOST_ROOT}")
FIND_PACKAGE(Boost 1.43 COMPONENTS filesystem regex REQUIRED)
 MESSAGE(STATUS "** Boost Include: ${Boost_INCLUDE_DIR}")
 MESSAGE(STATUS "** Boost Libraries: ${Boost_LIBRARY_DIRS}")
 MESSAGE(STATUS "** Boost Libraries: ${Boost_LIBRARIES}")

INCLUDE_DIRECTORIES(${BOOST_INCLUDE_DIR})
LINK_DIRECTORIES(${Boost_LIBRARY_DIRS})

ADD_SUBDIRECTORY(src)

And include some boost headers in my code like this:

#include <boost/regex.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/fstream.hpp>

Now the output from cmake looks ok

-- ** Search Boost root: /home/oli/usr
-- Boost version: 1.43.0
-- Found the following Boost libraries:
--   filesystem
--   regex
-- ** Boost Include: /home/oli/usr/include
-- ** Boost Libraries: /home/oli/usr/lib
-- ** Boost Libraries: /home/oli/usr/lib/libboost_filesystem.so;/home/oli/usr/lib/libboost_regex.so

But I get this error:

error: boost/regex.hpp: No such file or directory

(and similar for the other includes). Full output from make VERBOSE=1 can be found here http://pastebin.ca/2039425. It looks as though there is no -I flag added even though Boost_INCLUDE_DIR seems to be set correctly.

I'm using CMake 2.8.1 by the way. I would very much appreciate any hints on what is going wrong here..

EDIT: I've found the problem. Seems I pulled some ancient version of my standard CMakeLists.txt from the depths of my archives. It needs to be:

INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIR})

(note the non-capitalized "Boost")... Maybe older versions of CMake have been more tolerant in this respect or by bad luck I simply chose to start with a version of my CMakeLists.txt with an unfixed bug..

Since you did not specify a mode for find_package, it attempts to first use MODULE mode, and then CONFIG mode. As per the docs for the FindBoost module, the cache variable storing the directory containing Boost headers is named Boost_INCLUDE_DIR and not BOOST_INCLUDE_DIR. As per the CMake language docs' section on variables, CMake variable names are case-sensitive. I don't know why you had another CMakeLists.txt file with BOOST_INCLUDE_DIR working.