R devel - Mar 2010 - for help on building a R package with several R function and a bunch of c, c++

Hope I can get quick help from here, I have a bunch of c, c++ included main
function and makefile. It works well on both UNIX and windows. I tried to build
R package which include this C++ program and several other R functions.  These R
functions here are independent of c++ code. I prefer to define one R function to
call this c++ program.

I know how to build R package with just R function, But I don't know how to
handle those c++, c and makefile  after I copied them in  /src.  I am reading
manual "Writing R Extensions", I didn't catch the key point . Do
you guys anybody know easy way to do it?.

Thank you in advance! 

Alex

Hope I can get quick help from here, I have a bunch of c, c++ included main
function and makefile. It works well on both UNIX and windows. I tried to build
R package which include this C++ program and several other R functions.  These R
function here are independent  of c++ code. I prefer to define one R function to
call this c++ program (main function).

I know how to build R package with just R function, but I don't know how to
handle those c++ c code after I copied those  code  in ./src, I am reading
manual "Writing R Extensions" , but I did n't catch the key point
. Do you know any easy way to do it? ,

Thank you in advance! 

Alex