Downloaded the trunk ( Today Nov 2 ) Did: ./bjam --with-libraries=graph,regex ./bjam compiled OK. mv boost-trunk/stage/lib/* /usr/local/lib mv boost-trunk/boost /usr/include my program plc.cpp compiled OK with the following makefile. g++ -ggdb -O3 plc.cpp -o plc -I./Includes -L/usr/local/lib -lboost_graph -lboost_regex But running plc gave the following error ./plc < graph.xml > out.xml ./plc: error while loading shared libraries: libboost_graph.so.1.45.0: cannot open shared object file: No such file or directory But clearly libboost_graph.so.1.45.0 is there. [george@localhost lib]$ ls -lrt /usr/local/lib total 6768 -rwxr-xr-x 1 root root 1155683 Nov 2 20:57 libboost_regex.so.1.45.0 -rwxr-xr-x 1 root root 1155683 Nov 2 20:57 libboost_regex.so -rw-r--r-- 1 root root 2563346 Nov 2 20:57 libboost_regex.a -rwxr-xr-x 1 root root 534275 Nov 2 20:57 libboost_graph.so.1.45.0 -rwxr-xr-x 1 root root 534275 Nov 2 20:57 libboost_graph.so -rw-r--r-- 1 root root 923492 Nov 2 20:57 libboost_graph.a [george@localhost lib]$ Whats wrong? Running Centos 5.5 [george@localhost Program]$ uname -a Linux localhost.localdomain 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux Thanks