In EPROP, avoid a <= old if bad is set, Richard Stallman, May 91.
Use gstddef.h, not stddef.h, Richard Stallman, Nov 91.
Don't declare malloc, instead cast the value, Richard Stallman, Nov 91.
+ Include sys/types.h before signal.h, Apr 92.
COMPILING
With luck and a following wind, just the following will work:
#ifdef NO_SIG
#define jmp_buf int
#else
+#include <sys/types.h>
#include <signal.h>
#include <setjmp.h>
#endif