#ifndef __ERROR_H#define __ERROR_H#ifndef _RESEARCH_SOURCE   This header file is not defined in pure ANSI or POSIX#endif#pragma lib "/$M/lib/ape/libv.a" #ifdef __cplusplusextern "C" {#endif extern char *_progname;		/* program name */extern void _perror(char *);	/* perror but with _progname */ #ifdef __cplusplus}#endif #endif /* _ERROR_H */