[c-prog] error: symbol(s) not found

[Jos Timanta Tarigan]

hi, 

im currently building a program using a .dylib (or .lib). (i think) i got no 
problem on linking the .dylib. the problem is when i compile it, it says an 
error: 

MLibrary::cleanup(int), referenced from:
exportMaya(char *) in MayaExporter.o
symbol(s) not found 

what is the definition of that error? 
does any1 here using XCode on OS X?