For the outermost function needing a context frame, use the address of that frame as the nest argument instead of the address of a single-element list containing only that frame address. This saves some stack space and reduces memory accesses.

#ifndef __RMEM_H__
#define __RMEM_H__

// jam memory stuff here

#include "mem.h"

#if (defined (__SVR4) && defined (__sun))
#include <alloca.h>
#endif

#ifdef __MINGW32__
#include <malloc.h>
#endif

#endif // __RMEM_H__