diff --git a/src/os_vms_conf.h b/src/os_vms_conf.h
new file mode 100644
index 0000000..0064608
--- /dev/null
+++ b/src/os_vms_conf.h
@@ -0,0 +1,185 @@
+/* os_vms_conf.h.  Replaces auto/config.h for VMS */
+
+#define CASE_INSENSITIVE_FILENAME   /* Open VMS is case insensitive */
+#define SPACE_IN_FILENAME	    /* There could be space between user and passwd */
+#define FNAME_ILLEGAL "|*#?%"       /* Illegal characters in a file name */
+#define BINARY_FILE_IO		    /* Use binary fileio */
+#define USE_GETCWD
+#define USE_SYSTEM
+
+/* Define when terminfo support found */
+#undef TERMINFO
+
+/* Define when termcap.h contains ospeed */
+/* #define HAVE_OSPEED */
+
+/* Define when termcap.h contains UP, BC and PC */
+/* #define HAVE_UP_BC_PC */
+
+/* Define when termcap.h defines outfuntype */
+/*#define HAVE_OUTFUNTYPE */
+
+/* Define when __DATE__ " " __TIME__ can be used */
+#define HAVE_DATE_TIME
+
+/* Defined to the size of an int */
+#define SIZEOF_INT 4
+
+/* #undef USEBCOPY */
+#define USEMEMMOVE
+/* #undef USEMEMCPY */
+
+/* Define when "man -s 2" is to be used */
+/* #undef USEMAN_S */
+
+/* Define to empty if the keyword does not work.  */
+/* #undef const */
+
+/* Define to `int' if <sys/types.h> doesn't define.  */
+/* #undef mode_t */
+
+/* Define to `long' if <sys/types.h> doesn't define.  */
+/* #undef off_t */
+
+/* Define to `long' if <sys/types.h> doesn't define.  */
+/* #undef pid_t */
+
+/* Define to `unsigned' if <sys/types.h> doesn't define.  */
+/* #undef size_t */
+
+/* Define to `int' if <sys/types.h> doesn't define.  */
+/* #undef uid_t */
+
+/* Define to `int' if <sys/types.h> doesn't define.  */
+/* #undef gid_t */
+
+/* Define to `long' if <sys/types.h> doesn't define.  */
+/* #undef ino_t */
+
+/* Define if you have the nanosleep() function.  */
+/* #undef HAVE_NANOSLEEP */
+
+/* Define if you can safely include both <sys/time.h> and <time.h>.  */
+#define TIME_WITH_SYS_TIME
+
+/* Define if you can safely include both <sys/time.h> and <sys/select.h>.  */
+/* #undef SYS_SELECT_WITH_SYS_TIME */
+
+/* Define as the return type of signal handlers (int or void).  */
+#define RETSIGTYPE void
+
+/* Define as the command at the end of signal handlers ("" or "return 0;").  */
+#define SIGRETURN return
+
+/* Define if struct sigcontext is present */
+#define HAVE_SIGCONTEXT
+
+/* Define if toupper/tolower only work on lower/upercase characters */
+/* #define BROKEN_TOUPPER */
+
+/* Define if tgetstr() has a second argument that is (char *) */
+/* #undef TGETSTR_CHAR_P */
+
+/* Define if you have the sigset() function.  */
+/* #undef HAVE_SIGSET */
+
+/* Define if you have the setpgid() function.  */
+/* #undef HAVE_SETPGID */
+
+/* Define if you have the setsid() function.  */
+/* #undef HAVE_SETSID */
+
+/* Define if you have the sigset() function.  */
+/* #undef HAVE_SIGSET */
+
+#define TGETENT_ZERO_ERR
+#define HAVE_GETCWD
+#define HAVE_STRCSPN
+#define HAVE_STRTOL
+#define HAVE_TGETENT
+#define HAVE_MEMSET
+#define HAVE_MEMCMP
+#define HAVE_STRERROR
+#define HAVE_FCHOWN
+#define HAVE_RENAME
+#define HAVE_QSORT
+#define HAVE_FSYNC
+#define HAVE_GETPWUID
+#define HAVE_GETPWNAM
+#define	HAVE_STDLIB_H
+#define	HAVE_STRING_H
+#define	HAVE_ERRNO_H
+#define HAVE_OPENDIR
+#define HAVE_PUTENV
+#define HAVE_SETENV
+#define HAVE_SETJMP_H
+
+#undef	HAVE_DIRENT_H
+#undef	HAVE_SYS_NDIR_H
+#undef	HAVE_SYS_DIR_H
+#undef	HAVE_NDIR_H
+#undef	HAVE_SYS_WAIT_H
+#undef	HAVE_UNION_WAIT
+#undef  HAVE_SYS_SELECT_H
+#undef  HAVE_SYS_UTSNAME_H
+#undef  HAVE_SYS_SYSTEMINFO_H
+#undef  HAVE_TERMCAP_H
+#undef	HAVE_SGTTY_H
+#undef	HAVE_SYS_IOCTL_H
+#undef	HAVE_TERMIO_H
+#undef	HAVE_STROPTS_H
+#undef	HAVE_SYS_STREAM_H
+#undef	HAVE_SYS_PTEM_H
+#undef	HAVE_TERMIOS_H
+#undef	HAVE_LIBC_H
+#undef	HAVE_SYS_STATFS_H
+#undef	HAVE_SYS_POLL_H
+#undef	HAVE_PWD_H
+#undef  HAVE_FCHDIR
+
+/* Hardware specific */
+#ifdef  VAX
+#undef  HAVE_GETTIMEOFDAY
+#undef  HAVE_USLEEP
+#undef  HAVE_STRCASECMP
+#undef  HAVE_STRINGS_H
+#undef	HAVE_SIGSETJMP
+#else
+#define HAVE_GETTIMEOFDAY
+#define HAVE_USLEEP
+#define HAVE_STRCASECMP
+#define HAVE_STRINGS_H
+#define	HAVE_SIGSETJMP
+#endif
+
+/* Compiler specific */
+#ifdef  VAXC
+#undef  HAVE_SELECT
+#undef  HAVE_FCNTL_H
+#undef  HAVE_UNISTD_H
+#undef  HAVE_SYS_TIME_H
+#undef  HAVE_LOCALE_H
+#define BROKEN_LOCALE
+#undef  HAVE_ICONV_H
+#undef  HAVE_ICONV
+#undef  DYNAMIC_ICONV
+#undef	HAVE_STRFTIME
+#else
+#define HAVE_SELECT
+#define HAVE_FCNTL_H
+#define HAVE_UNISTD_H 1
+#define HAVE_SYS_TIME_H
+#define HAVE_LOCALE_H
+#define BROKEN_LOCALE
+#undef  HAVE_ICONV_H
+#undef  HAVE_ICONV
+#undef  DYNAMIC_ICONV
+#define	HAVE_STRFTIME
+#endif
+
+/* GUI support defines */
+#ifdef FEAT_GUI_MOTIF
+#define HAVE_X11
+#define USE_FONTSET
+#undef  X_LOCALE
+#endif