Hi Team, I built boost 1.40 iostream lib with xlc 6.0: setenv NO_BZIP2 1 setenv NO_ZLIB 1 bjam -d+2 --prefix= .... boost/aix64 --with-thread toolset=vacpp cflags="-q64 " cxxflags="-q64" link=shared linkflags="-q64" threading=multi --with-iostreams --layout=versioned install Even when I attempt to build without bzip2 support, why am I getting unresolved symbols at run time of executable linked? Am i missing something here? rtld: 0712-001 Symbol BZ2_bzCompressEnd was referenced from module ....stage-O/lib/aix64/libboost_iostreams-xlc-mt-1_40.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol BZ2_bzDecompressEnd was referenced from module ....stage-O/lib/aix64/libboost_iostreams-xlc-mt-1_40.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol BZ2_bzCompress was referenced from module .... aix64/libboost_iostreams-xlc-mt-1_40.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol BZ2_bzDecompress ....stage-O/lib/aix64/libboost_iostreams-xlc-mt-1_40.so was referenced from module ...stage-O/lib/aix64/libboost_iostreams-xlc-mt-1_40.so(), but a runtime definition of the symbol was not found. rtld: 0712-001 Symbol BZ2_bzCompressInit was referenced from module ..stage-O/lib/aix64/libboost_iostreams-xlc-mt-1_40.so(), but a runtime definition of the symbol was not found. Thanks in advance, Radha