R help - Nov 2008 - Making R Package (how to include a library)

Hi All,
I am making a R package which uses some C code. and existing library.My src
folder has some .c files. and a Makevars.in
Makevars.in contains
export PKG_LIBS="-L. -lbz2"
R CMD SHLIB bed2vector.C
R CMD SHLIB wdl.C
R CMD SHLIB peaks.C
R CMD SHLIB cdensum.c

When I try library(libraryname). It gives me error  undefined symbol:
BZ2_bzRead
Can anyone please suggest how to include a exiting library along with .c
files to make a Rpackage

thank you
vidhu

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