Stripped down the library to something approaching the ANSI C minimum and replaced most of the header files, to provide a reasonably consistent base to work up from.

lang/cem/libcc.ansi/headers/setjmp.h

@@ -25,15 +25,9 @@ typedef struct {
 	void *__lb;
 } jmp_buf[1];
 
-int	__setjmp(jmp_buf _env, int _savemask);
+extern int __setjmp(jmp_buf _env, int _savemask);
 
 #define	setjmp(env)	__setjmp(env, 0)
-void	longjmp(jmp_buf _env, int _val);
-
-#if defined(_POSIX_SOURCE)
-typedef jmp_buf sigjmp_buf;
-#define	sigsetjmp(env, savemask)	__setjmp(env, savemask)
-int	siglongjmp(sigjmp_buf _env, int _val);
-#endif
+extern void longjmp(jmp_buf _env, int _val);
 
 #endif	/* _SETJMP_H */