Hi, Perhaps a bit off-topic, but I'm new to boost, so I don't know better. My program is named yamas. Now, when I do g++ -o trunk/yamas.o -c -fopenmp -O3 -Wall trunk/yamas.cpp there aren't any warnings or errors, but g++ -o yamas -fopenmp trunk/yamas.o tells me yamas.cpp:(.text+0x362): undefined reference to `boost::program_options::options_description::m_default_line_length' and goes on with many more compiler messages. My question now is, how can I make g++ aware of boost during the linking process. I tinkered with -L/usr/local/lib (where my boost libraries are), but without success. Specifically stating -llibboost_program_options lets g++ tell me that I cannot find this library. However, /usr/local/lib is in LD_LIBRARY_PATH and libboost_program_options.so in there - installed today. Any hints for me? TIA Christian