My linkflags setting involves a dollar sign: linkflags='-R/opt/csw/lib/$ISALIST' The $ISALIST dynamic token tells the linker to iterate through supported instruction sets and pick the best one[1]. When the Boost binaries are built, the RPATH in the binaries is missing the dollar sign and everything after it: $ /usr/ccs/bin/dump -Lv work/solaris10-sparc/pkgroot/opt/csw/gxx/lib/sparcv9/libboost_iostreams.so.1.49.0 | grep RPATH [13] RPATH /opt/csw/lib/64:/opt/csw/gxx/lib/:/opt/csw/gxx/lib/64:/opt/csw/lib/ Do you see the /opt/csw/lib/ bit with the slash at the end? It could be explained by the contents of linkflags being interpolated by a shell. In my build, it's important to pass the dollar sign unchanged. Here's an example of correctly set RPATH: /usr/ccs/bin/dump -Lv /opt/csw/lib/libz.so.1 | grep RPATH [6] RPATH /opt/csw/lib/$ISALIST:/opt/csw/lib I need to pass the same flag to Boost libraries. Has anyone else seen this problem? Maciej [1] http://docs.oracle.com/cd/E19082-01/819-0690/appendixc-3/index.html