Not every system has perl installed in /usr/bin/, so change the shebang

(#!) line to `/usr/bin/env perl` to locate perl on the PATH.

Everything after the first pathname in the shebang line is treated as
a single argument to the command interpreter (/usr/bin/env "perl -w"),
and there is not ordinarily any such program as "perl -w".  So if the
old shebang line used an option such as `-w`, add a `use warnings;`
statement to the script---note that the semantics change slightly.
`bin/destdep` uses a trick to pass `-p` to `/usr/bin/env perl`.  It
couldn't hurt to use the same trick to pass `-w`.

With these changes, `sh autogen.sh` runs on NetBSD.  It ought to still
work on every other system HDF5 supports, too.

bin/checkapi

@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 #
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.
@@ -13,6 +13,8 @@
 #
 require 5.003;
 
+use warnings;
+
 # Purpose: insures that API functions aren't called internally.
 # Usage:   checkapi H5*.c
 my $filename = "";

bin/checkposix

@@ -1,5 +1,6 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 require 5.003;
+use warnings;
 
 #
 # Copyright by The HDF Group.

bin/debug-ohdr

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.

bin/dependencies

@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 #
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.
@@ -11,6 +11,8 @@
 # If you do not have access to either file, you may request a copy from
 # help@hdfgroup.org.
 #
+use warnings;
+
 my $depend_file;
 my $new_depend_file;
 my $srcdir;

bin/distdep

@@ -1,4 +1,7 @@
-#!/usr/bin/perl -p
+#!/bin/sh
+#! -*-perl-*-
+eval 'exec perl -p -x -S $0 ${1+"$@"}'
+  if 0;
 #
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.

bin/errors

@@ -1,5 +1,6 @@
-#!/usr/local/bin/perl -w
+#!/usr/bin/env perl
 require 5.003;
+use warnings;
 use Text::Tabs;
 
 # NOTE: THE FORMAT OF HRETURN_ERROR AND HGOTO_ERROR MACROS HAS

bin/iostats

@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.

bin/make_err

@@ -1,6 +1,7 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 require 5.003;
 $indent=4;
+use warnings;
 
 #
 # Copyright by The HDF Group.

bin/make_overflow

@@ -1,6 +1,7 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 require 5.003;
 use strict;
+use warnings;
 
 # Global settings
 

bin/make_vers

@@ -1,5 +1,6 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 require 5.003;
+use warnings;
 
 # Global settings
 # (The max_idx parameter is the only thing that needs to be changed when adding

bin/runbkgprog

@@ -1,5 +1,6 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 require 5.003;
+use warnings;
 $indent=4;
 
 #

bin/trace

@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 ##
 # Copyright by The HDF Group.
 # Copyright by the Board of Trustees of the University of Illinois.
@@ -12,6 +12,7 @@
 # help@hdfgroup.org.
 ##
 require 5.003;
+use warnings;
 $Source = "";
 
 ##############################################################################