Hi everyone For a mutual exclusion on a SerialInterface class, I used a Boost Interprocess Mutex, which compiled on MinGW without any problems. Using the same code on my arm-linux-gcc cross compilation tool chain (Version 3.3.2) renders the following error: g++ -I"/home/othmarsen/Documents/Software/C++/MOXA/UC-7112/ewbmeter" -I"/home/othmarsen/Documents/Software/C++/MOXA/UC-7112/pss" -I/opt/c++/boost/boost_1_39_0 -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"Interface/MockSerialInterface.d" -MT"Interface/MockSerialInterface.d" -o"Interface/MockSerialInterface.o" "../Interface/MockSerialInterface.cpp" In file included from /opt/c++/boost/boost_1_39_0/boost/interprocess/sync/emulation/named_creation _functor.hpp:16, from /opt/c++/boost/boost_1_39_0/boost/interprocess/sync/named_mutex.hpp:22, from /home/othmarsen/Documents/Software/C++/MOXA/UC-7112/ewbmeter/ewbmeter/Interf ace/Interface.h:5, from /home/othmarsen/Documents/Software/C++/MOXA/UC-7112/ewbmeter/ewbmeter/Interf ace/SerialInterface.h:5, from ../Interface/MockSerialInterface.h:4, from ../Interface/MockSerialInterface.cpp:1: /opt/c++/boost/boost_1_39_0/boost/interprocess/detail/mpl.hpp:67: warning: all member functions in class `boost::interprocess::detail::is_convertible' are private In file included from /opt/c++/boost/boost_1_39_0/boost/interprocess/sync/posix/semaphore_wrapper. hpp:17, from /opt/c++/boost/boost_1_39_0/boost/interprocess/sync/named_mutex.hpp:26, from /home/othmarsen/Documents/Software/C++/MOXA/UC-7112/ewbmeter/ewbmeter/Interf ace/Interface.h:5, from /home/othmarsen/Documents/Software/C++/MOXA/UC-7112/ewbmeter/ewbmeter/Interf ace/SerialInterface.h:5, from ../Interface/MockSerialInterface.h:4, from ../Interface/MockSerialInterface.cpp:1: /opt/c++/boost/boost_1_39_0/boost/interprocess/detail/os_file_functions.hpp: In function `bool boost::interprocess::detail::delete_subdirectories_recursive(const std::string&, const char*)': /opt/c++/boost/boost_1_39_0/boost/interprocess/detail/os_file_functions.hpp: 461: error: `::' does not have a class or union named `stat' Any ideas on that? Thanks and best regards Kessi