$ jam -q plugins
...patience...
...patience...
...patience...
...found 3757 target(s)...
...updating 6 target(s)...
LinkPlugin engine.so

    g++ -Wl,--as-needed -o engine.so ./out/linux/optimize/plugins/engine/3d/impman.o ./out/linux/optimize/plugins/engine/3d/meshobj.o ./out/linux/optimize/plugins/engine/3d/meshlod.o ./out/linux/optimize/plugins/engine/3d/sharevar.o ./out/linux/optimize/plugins/engine/3d/halogen2.o ./out/linux/optimize/plugins/engine/3d/material.o ./out/linux/optimize/plugins/engine/3d/portal.o ./out/linux/optimize/plugins/engine/3d/engine.o ./out/linux/optimize/plugins/engine/3d/objwatch.o ./out/linux/optimize/plugins/engine/3d/sector.o ./out/linux/optimize/plugins/engine/3d/portalcontainer.o ./out/linux/optimize/plugins/engine/3d/lightmgr.o ./out/linux/optimize/plugins/engine/3d/campos.o ./out/linux/optimize/plugins/engine/3d/light.o ./out/linux/optimize/plugins/engine/3d/camera.o ./out/linux/optimize/plugins/engine/3d/impmesh.o ./out/linux/optimize/plugins/engine/3d/meshfact.o ./out/linux/optimize/plugins/engine/3d/lghthalo.o ./out/linux/optimize/plugins/engine/3d/texture.o ./out/linux/optimize/plugins/engine/3d/reflectomotron3000.o ./out/linux/optimize/plugins/engine/3d/halogen.o ./out/linux/optimize/plugins/engine/3d/meshgen/meshgen_positionmap.o ./out/linux/optimize/plugins/engine/3d/meshgen/meshgen.o ./out/linux/optimize/plugins/engine/3d/meshgen/densityfactormap.o ./out/linux/optimize/plugins/engine/3d/plugin_impl.o  -lc -lm -ldl -lnsl -L/usr/local/lib -Wl,-z,defs -Wl,--warn-unresolved-symbols -g2 -shared -Wl,--gc-sections -fPIC ./out/linux/optimize/libs/libcrystalspace-2.1.so -lz -lpthread -lpthread -lc -lm -ldl -lnsl -L/usr/local/lib -Wl,-z,defs -Wl,--warn-unresolved-symbols -g2 \
      -Wl,-soname,engine.so

...failed LinkPlugin engine.so ...
...failed updating 1 target(s)...