hello all i cloned the git repository by following command. i use ubuntu12.10 1) git clone --recursive https://github.com/boostorg/boost.git modular-boost 2) ./bootstrap.sh 3) ./b2 headers after this on running the following command for separately compiled libraries, 4) ./b2 and i got the error like following. gcc.compile.c++ bin.v2/libs/iostreams/build/ gcc-4.7/release/link-static/threading-multi/bzip2.o libs/iostreams/src/bzip2.cpp:20:56: fatal error: bzlib.h: No such file or directory compilation terminated. "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pthread -DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_USE_DEPRECATED -DNDEBUG -I"." -c -o "bin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi/bzip2.o" "libs/iostreams/src/bzip2.cpp" ...failed gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.7/release/link-static/threading-multi/bzip2.o... ...skipped libboost_iostreams.a(clean) for lack of bzip2.o... ...skipped libboost_iostreams.a for lack of bzip2.o... ...skipped libboost_iostreams.a for lack of libboost_iostreams.a... gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi/bzip2.o libs/iostreams/src/bzip2.cpp:20:56: fatal error: bzlib.h: No such file or directory compilation terminated. "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pthread -fPIC -DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_DYN_LINK=1 -DBOOST_IOSTREAMS_USE_DEPRECATED -DNDEBUG -I"." -c -o "bin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi/bzip2.o" "libs/iostreams/src/bzip2.cpp" ...failed gcc.compile.c++ bin.v2/libs/iostreams/build/gcc-4.7/release/threading-multi/bzip2.o... ...skipped libboost_iostreams.so.1.55.0 for lack of bzip2.o... ...skipped libboost_iostreams.so.1.55.0 for lack of libboost_iostreams.so.1.55.0... ...skipped libboost_iostreams.so for lack of libboost_iostreams.so.1.55.0... ...failed updating 2 targets... ...skipped 6 targets... i would appreciate if someone would guide me how to solve the problem. thank you!