building docs for one library

I've patched in the coroutine library into my boost 1.37 tree and want to 
build the documenation
for it.  When I invoke bjam either from within the directory containing the 
files for from the
boost root I get a series of messages back that i don't understand - see 
below.

What is the proper way to invoke the documentation build for one library?

Robert Ramey

$ pwd
C:/boost_1_37_0/libs/coroutine/doc
$ ls
Jamfile.v2     coroutine.qbk  index.html     index_files

$ bjam
Jamfile.v2:36: in modules.load
rule doxygen unknown in module Jamfile</C:/boost_1_37_0/libs/coroutine/doc>.
C:/boost_1_37_0/tools/build/v2/build\project.jam:307: in load-jamfile
C:/boost_1_37_0/tools/build/v2/build\project.jam:62: in load
C:/boost_1_37_0/tools/build/v2/build\project.jam:168: in project.find
C:/boost_1_37_0/tools/build/v2\build-system.jam:535: in load
C:\boost_1_37_0\tools\build\v2/kernel\modules.jam:283: in import
C:\boost_1_37_0\tools\build\v2/kernel/bootstrap.jam:128: in boost-build
C:\boost_1_37_0\boost-build.jam:16: in module scope
$