/sys$common/syshlp/helplib.hlb CC, Run-time functions, perror  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Writes a short message to stderr describing the last error
  encountered during a call to the Compaq C RTL from a C program.

  Syntax:

       #include <stdio.h>

       void perror(const char *string);