Switched from "extern int errno" to "#include <errno.h>".

c/build-tools/cklength.c

@@ -34,6 +34,7 @@ maximum line length.  The default maximum line length is 80.\n\
 #include <string.h>
 #include <memory.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "config.h"
 
@@ -85,7 +86,6 @@ int line_length = 80;                   /* maximum allowable line length */
 
 extern char *optarg;                    /* getopt(3) control vars */
 extern int optind, opterr;
-extern int errno;
 
 char *progname;                         /* for error() */
 

c/build-tools/eolstrip.c

@@ -29,6 +29,7 @@ Strip the white space from the end of every line on the list of files.\n\
 #include <string.h>
 #include <memory.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "config.h"
 
@@ -78,7 +79,6 @@ int test_only = FALSE;                  /* test only */
 
 extern char *optarg;                    /* getopt(3) control vars */
 extern int optind, opterr;
-extern int errno;
 
 char *progname;                         /* for error() */
 

c/build-tools/src/cklength.c

@@ -34,6 +34,7 @@ maximum line length.  The default maximum line length is 80.\n\
 #include <string.h>
 #include <memory.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "config.h"
 
@@ -85,7 +86,6 @@ int line_length = 80;                   /* maximum allowable line length */
 
 extern char *optarg;                    /* getopt(3) control vars */
 extern int optind, opterr;
-extern int errno;
 
 char *progname;                         /* for error() */
 

c/build-tools/src/eolstrip.c

@@ -29,6 +29,7 @@ Strip the white space from the end of every line on the list of files.\n\
 #include <string.h>
 #include <memory.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "config.h"
 
@@ -78,7 +79,6 @@ int test_only = FALSE;                  /* test only */
 
 extern char *optarg;                    /* getopt(3) control vars */
 extern int optind, opterr;
-extern int errno;
 
 char *progname;                         /* for error() */
 

c/build-tools/src/unhex.c

@@ -37,6 +37,7 @@ usage:    unhex [-va] [ -o file ] [ file [file ... ] ]\n\
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "config.h"
 
@@ -96,7 +97,6 @@ u32 FFfill = 0L;                       /* how far to fill w 0xFF's */
 
 extern char *optarg;                    /* getopt(3) control vars */
 extern int optind;
-extern int errno;
 
 char *progname;                         /* for error() */
 

c/build-tools/unhex.c

@@ -37,6 +37,7 @@ usage:    unhex [-va] [ -o file ] [ file [file ... ] ]\n\
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <errno.h>
 
 #include "config.h"
 
@@ -96,7 +97,6 @@ u32 FFfill = 0L;                       /* how far to fill w 0xFF's */
 
 extern char *optarg;                    /* getopt(3) control vars */
 extern int optind;
-extern int errno;
 
 char *progname;                         /* for error() */