/boost/tools/build/src/build/generators.jam:1102: in ensure-type from module generators
error: target { link%link.do-link-recursively-mpl-headers. { libs/mpl/include/boost. } } has no type
/boost/tools/build/src/build/generators.jam:1359: in generators.construct from module generators
/boost/tools/build/src/build/targets.jam:1532: in construct from module object(typed-target)@2327
/boost/tools/build/src/build/targets.jam:1332: in class@basic-target.generate from module object(typed-target)@2327
/boost/tools/build/src/build/targets.jam:757: in generate-really from module object(main-target)@2329
/boost/tools/build/src/build/targets.jam:729: in class@main-target.generate from module object(main-target)@2329
/boost/tools/build/src/build/targets.jam:874: in targets.generate-from-reference from module targets
/boost/tools/build/src/build/targets.jam:1245: in generate-dependencies from module object(alias-target-class)@1476
/boost/tools/build/src/build/targets.jam:1302: in class@basic-target.generate from module object(alias-target-class)@1476
/boost/tools/build/src/build/targets.jam:757: in generate-really from module object(main-target)@1478
/boost/tools/build/src/build/targets.jam:729: in class@main-target.generate from module object(main-target)@1478
/boost/tools/build/src/tools/quickbook.jam:171: in class@quickbook-binary-generator.run from module object(quickbook-binary-generator)@216
/boost/tools/build/src/build/generators.jam:994: in try-one-generator-really from module generators
/boost/tools/build/src/build/generators.jam:1056: in try-one-generator from module generators
/boost/tools/build/src/build/generators.jam:1294: in construct-really from module generators
/boost/tools/build/src/build/generators.jam:1378: in generators.construct from module generators
/boost/tools/build/src/build/targets.jam:1532: in construct from module object(typed-target)@228
/boost/tools/build/src/build/targets.jam:1332: in class@basic-target.generate from module object(typed-target)@228
/boost/tools/build/src/build/targets.jam:757: in generate-really from module object(main-target)@233
/boost/tools/build/src/build/targets.jam:729: in class@main-target.generate from module object(main-target)@233
/boost/tools/build/src/build/targets.jam:874: in targets.generate-from-reference from module targets
/boost/tools/build/src/build/targets.jam:1245: in generate-dependencies from module object(boostbook-target-class)@227
/boost/tools/build/src/build/targets.jam:1299: in class@basic-target.generate from module object(boostbook-target-class)@227
/boost/tools/build/src/build/targets.jam:757: in generate-really from module object(main-target)@232
/boost/tools/build/src/build/targets.jam:729: in class@main-target.generate from module object(main-target)@232
/boost/tools/build/src/build/targets.jam:272: in class@project-target.generate from module object(project-target)@185
/boost/tools/build/src/build-system.jam:707: in load from module build-system
/boost/tools/build/src/kernel/modules.jam:289: in import from module modules
/boost/tools/build/src/kernel/bootstrap.jam:139: in boost-build from module
/boost/tools/build/boost-build.jam:8: in module scope from module