Hello, I have boost_1_32 version installed at /usr/include/boost Also, I have installed boost_1_34 at another path:/home/myname/work/boost/boost_1_34_0/ Now when I try to run with 1_34 version, it still points to 1_32 version at /usr/include (this is observed when I debug using gdb it refers to /usr/include/boost/regex/v4/match_results.hpp:118) I tried following things: 1] export LD_LIBRARY_PATH=/home/myname/work/boost/boost_1_34_0/boost:$LD_LIBRARY_PATH export PATH=/home/myname/work/boost/boost_1_34_0/boost:$PATH 2] I am using following command for compilation g++ -c -g -I/home/myname/work/boost/boost_1_34_0/boost ${TEST_FILES_PATH}/${TEST}.c g++ ${TEST}.o -L/home/myname/work/boost/lib -lboost_regex 3] I am including boost header in ${TEST}.c as below #include "boost/regex.hpp" Any help is most welcome. Thanks and Regards, Chandan ____________________________________________________________________________________ Pinpoint customers who are looking for what you sell. http://searchmarketing.yahoo.com/