diff -crb --new-file a/lib/error.h b/lib/error.h
*** a/lib/error.h	1969-12-31 19:00:00.000000000 -0500
--- b/lib/error.h	2021-01-21 04:38:25.000000000 -0500
***************
*** 0 ****
--- 1,27 ----
+ #ifndef _ERROR_H_
+ #define _ERROR_H_
+ 
+ #include <stdarg.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <errno.h>
+ 
+ static unsigned int error_message_count = 0;
+ 
+ static inline void error(int status, int errnum, const char* format, ...)
+ {
+ 	va_list ap;
+ 	fprintf(stderr, "%s: ", program_invocation_name);
+ 	va_start(ap, format);
+ 	vfprintf(stderr, format, ap);
+ 	va_end(ap);
+ 	if (errnum)
+ 		fprintf(stderr, ": %s", strerror(errnum));
+ 	fprintf(stderr, "\n");
+ 	error_message_count++;
+ 	if (status)
+ 		exit(status);
+ }
+ 
+ #endif	/* _ERROR_H_ */
diff -crb --new-file a/src/error.h b/src/error.h
*** a/src/error.h	1969-12-31 19:00:00.000000000 -0500
--- b/src/error.h	2021-01-21 04:38:29.000000000 -0500
***************
*** 0 ****
--- 1,27 ----
+ #ifndef _ERROR_H_
+ #define _ERROR_H_
+ 
+ #include <stdarg.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <errno.h>
+ 
+ static unsigned int error_message_count = 0;
+ 
+ static inline void error(int status, int errnum, const char* format, ...)
+ {
+ 	va_list ap;
+ 	fprintf(stderr, "%s: ", program_invocation_name);
+ 	va_start(ap, format);
+ 	vfprintf(stderr, format, ap);
+ 	va_end(ap);
+ 	if (errnum)
+ 		fprintf(stderr, ": %s", strerror(errnum));
+ 	fprintf(stderr, "\n");
+ 	error_message_count++;
+ 	if (status)
+ 		exit(status);
+ }
+ 
+ #endif	/* _ERROR_H_ */