boost-lib: build mt flavour of libaries and also build boost-regex

component/boost-lib/buildout.cfg

@@ -25,4 +25,14 @@ location = ${buildout:parts-directory}/${:_buildout_section_name_}
 configure-command = ./bootstrap.sh --prefix=${:location}
 make-binary =
 make-options =
-make-targets = BZIP2_INCLUDE='${bzip2:location}/include' BZIP2_LIBPATH='${bzip2:location}/lib' ./bjam link=shared --with-thread install
+make-targets =
+  ./bjam
+  --with-thread
+  --with-regex
+  --layout=tagged
+  --link=shared
+  --threading=multi
+  install
+environment =
+  BZIP2_INCLUDE='${bzip2:location}/include'
+  BZIP2_LIBPATH='${bzip2:location}/lib'