Hi, > After this fails, if i delete CMakeCache.txt and rerun the script, it > works. In fact it seems to be related to the line: > Boost_INCLUDE_DIR:PATH=/usr/include > which is in CMakeCache.txt. Than just delete that cache variable (before the second call of find_package): unset(Boost_INCLUDE_DIR CACHE) http://www.cmake.org/cmake/help/v3.1/command/unset.html Greetings, Marc