Add SPDX license identifiers to code files

Change manual pages word to recognize it by licensecheck tool.

Makefile

@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
 prefix = /usr
 
 ifdef DESTDIR

config.h

@@ -1,4 +1,5 @@
 /* Configurable features */
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 
 /* Always hide legal disclaimers */
 #undef ALWAYS_HIDE_DISCL

make_as32_del.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_as_del.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_ip_del.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_new_gtlds.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_nic_handles.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_servers_charset.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_tld_serv.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

make_version_h.pl

@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0-or-later
 
 use warnings;
 use strict;

mkpasswd.1

@@ -90,4 +90,5 @@ This program suffers of a bad case of featuritis.
 and this man page were written by Marco d'Itri
 .RI < md@linux.it >
 and are licensed under the terms of the GNU General Public License,
-version 2 or higher.
+version 2 or later.
+\" SPDX-License-Identifier: GPL-2.0-or-later

mkpasswd.c

@@ -14,6 +14,8 @@
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 /* for crypt, snprintf and strcasecmp */

utils.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 #ifndef WHOIS_UTILS_H
 #define WHOIS_UTILS_H
 

whois.1

@@ -304,5 +304,5 @@ original BSD client.
 and this man page were written by Marco d'Itri
 .RI < md@linux.it >
 and are licensed under the terms of the GNU General Public License,
-version 2 or higher.
-
+version 2 or later.
+\" SPDX-License-Identifier: GPL-2.0-or-later

whois.c

@@ -5,6 +5,8 @@
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 /* for AI_IDN */

whois.conf.5

@@ -47,3 +47,4 @@ This manual page was written by Petr Písař
 .RI < ppisar@redhat.com >
 and is licensed under the terms of the GNU General Public License,
 version 2 or higher.
+\" SPDX-License-Identifier: GPL-2.0-or-later

whois.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 #include "utils.h"
 
 /* 6bone referto: extension */