[R] libR.so - not recognized

[Elena Zheleva]

i have a problem executing my code. it compiles just
fine but during execution it gives me the following
error:

"./r_main: error while loading shared libraries:
libR.so: canot open shared object file: No such file
or directory"

in my makefile, i have specified: 

"LIBR=-L$(top_builddir)/bin -lR 'gtk-config --libs' 
#(the path to the executable libR.so is correct) 
r_main:r_main.o
         gcc -o r_main r_main.o $(LIBR)"

any ideas why it is not working? thanks in advance for
yor help!!!

elena zheleva