import modules ; local dll-suffix = so ; local prefix = "" ; if [ modules.peek : OS ] in CYGWIN NT { if $toolset = gcc { dll-suffix = dll ; } else { dll-suffix = lib ; } } else { prefix = "lib" ; } if $toolset = darwin { dll-suffix = dylib ; } project ext ; lib a : : debug/$(prefix)a.$(dll-suffix) debug : : debug ; lib a : : release/$(prefix)a.$(dll-suffix) release : : release ;