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.

1 files changed, 2 insertions, 1 deletions

diff --git a/bin/trace b/bin/trace
index 3cae0a4..34bcd3a 100755
--- a/bin/trace
+++ b/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 = "";
 
 ##############################################################################