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...amically loaded from the file named in dllname. I use getNativeSymbolInfo(func, dllname)$address to get the address of the function and pass it to a C function called via the .Call interface. Inside that C function, I use R_ExternalPtrAddr(deriv_func) to get the function pointer. This requires typcasting the return value of R_ExternalPtrAddr from (void *) to (deriv_func *), defined in a typedef in call_lsoda(). To be more explicit (I'm replacing irrelevant arguments with ellipses): In lsoda(...,func,dllname,...), func contains a string giving the name of a function which is defined in the dl...