This is a collection of four libraries which can be used to build foreign function call interfaces in embedded interpreters. The four packages are: avcall - calling C functions with variable arguments vacall - C functions accepting variable argument prototypes trampoline - closures as first-class C functions callback - closures with variable arguments as first-class C functions (a reentrant combination of vacall and trampoline) WWW: http://clisp.cons.org/~haible/packages-ffcall.html