tar -xf xdg-utils-1.1.3.tar.gz
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -Naur xdg-utils-1.1.3-orig/scripts/xdg-open.in xdg-utils-1.1.3/scripts/xdg-open.in
|--- xdg-utils-1.1.3-orig/scripts/xdg-open.in	2018-05-10 18:02:31.000000000 +0300
|+++ xdg-utils-1.1.3/scripts/xdg-open.in	2018-05-18 01:31:53.909221474 +0300
--------------------------
patching file scripts/xdg-open.in
Using Plan A...
Hunk #1 succeeded at 438.
done
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/ginstall -c
checking for xmlto... /usr/bin/xmlto
configure: creating ./config.status
config.status: creating Makefile
config.status: creating scripts/Makefile
config.status: WARNING:  'scripts/Makefile.in' seems to ignore the --datarootdir setting
config.status: creating tests/Makefile
config.status: WARNING:  'tests/Makefile.in' seems to ignore the --datarootdir setting
config.status: creating autotests/Makefile
make[1]: Entering directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/tests'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/tests'
make[1]: Entering directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/autotests'
make[1]: Nothing to be done for 'all'.
make[1]: Leaving directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/autotests'
make[1]: Entering directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/scripts'
(cat html/index.html.pre; \
         xsltproc xsl/refentry2htmlindex.xsl desc/xdg-desktop-menu.xml desc/xdg-desktop-icon.xml desc/xdg-mime.xml desc/xdg-icon-resource.xml desc/xdg-open.xml desc/xdg-email.xml desc/xdg-screensaver.xml desc/xdg-settings.xml; \
         cat html/index.html.post ) > html/index.html
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-desktop-menu.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-desktop-icon.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-mime.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-icon-resource.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-open.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-email.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-screensaver.xml)
(cd html;/usr/bin/xmlto html-nochunks ../desc/xdg-settings.xml)
(cd man;/usr/bin/xmlto man ../desc/xdg-desktop-menu.xml)
(cd man;/usr/bin/xmlto man ../desc/xdg-desktop-icon.xml)
(cd man;/usr/bin/xmlto man ../desc/xdg-mime.xml)
(cd man;/usr/bin/xmlto man ../desc/xdg-icon-resource.xml)
Warn: AUTHOR sect.: no personblurb|contrib for Kevin Krammer       xdg-desktop-icon
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-desktop-icon
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-desktop-icon
Warn: AUTHOR sect.: no personblurb|contrib for Jeremy White        xdg-desktop-icon
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-desktop-icon
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-desktop-icon
Warn: AUTHOR sect.: no personblurb|contrib for Kevin Krammer       xdg-mime
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-mime
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-mime
Warn: AUTHOR sect.: no personblurb|contrib for Kevin Krammer       xdg-icon-resourceWarn: AUTHOR sect.: no personblurb|contrib for Jeremy White        xdg-mime

Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-mimeNote: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-icon-resource

Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-icon-resource
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-mime
Warn: AUTHOR sect.: no personblurb|contrib for Jeremy White        xdg-icon-resource
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-icon-resource
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-icon-resource
Warn: AUTHOR sect.: no personblurb|contrib for Kevin Krammer       xdg-desktop-menu
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-desktop-menu
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-desktop-menu
Warn: AUTHOR sect.: no personblurb|contrib for Jeremy White        xdg-desktop-menu
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-desktop-menu
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-desktop-menu
Note: Writing xdg-desktop-icon.1
Note: Writing xdg-mime.1
Note: Writing xdg-icon-resource.1
(cd man;/usr/bin/xmlto man ../desc/xdg-open.xml)
(cd man;/usr/bin/xmlto man ../desc/xdg-email.xml)
(cd man;/usr/bin/xmlto man ../desc/xdg-screensaver.xml)
Note: Writing xdg-desktop-menu.1
(cd man;/usr/bin/xmlto man ../desc/xdg-settings.xml)
Warn: AUTHOR sect.: no personblurb|contrib for Kevin Krammer       xdg-open
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-open
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-open
Warn: AUTHOR sect.: no personblurb|contrib for Jeremy White        xdg-open
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-open
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-open
Warn: AUTHOR sect.: no personblurb|contrib for Kevin Krammer       xdg-email
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-email
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-email
Warn: AUTHOR sect.: no personblurb|contrib for Jeremy White        xdg-email
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-email
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-email
Warn: AUTHOR sect.: no personblurb|contrib for Bryce Harrington    xdg-screensaver
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-screensaver
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-screensaver
Warn: AUTHOR sect.: no personblurb|contrib for Mike Mammarella     xdg-settings
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/contr  xdg-settings
Note: AUTHOR sect.: see http://www.docbook.org/tdg5/en/html/perso  xdg-settings
Note: Writing xdg-open.1
/usr/bin/xmlto txt desc/xdg-desktop-menu.xml
Note: Writing xdg-email.1
Note: Writing xdg-screensaver.1
Note: Writing xdg-settings.1
/usr/bin/xmlto txt desc/xdg-desktop-icon.xml
/usr/bin/xmlto txt desc/xdg-mime.xml
/usr/bin/xmlto txt desc/xdg-icon-resource.xml
/usr/bin/xmlto txt desc/xdg-open.xml
/usr/bin/xmlto txt desc/xdg-email.xml
/usr/bin/xmlto txt desc/xdg-screensaver.xml
/usr/bin/xmlto txt desc/xdg-settings.xml
awk -f generate-help-script.awk xdg-desktop-menu.in | sed -e 's/@NAME@/'xdg-desktop-menu'/g' > xdg-desktop-menu
awk -f generate-help-script.awk xdg-desktop-icon.in | sed -e 's/@NAME@/'xdg-desktop-icon'/g' > xdg-desktop-icon
chmod a+x xdg-desktop-menu
chmod a+x xdg-desktop-icon
awk -f generate-help-script.awk xdg-mime.in | sed -e 's/@NAME@/'xdg-mime'/g' > xdg-mime
awk -f generate-help-script.awk xdg-icon-resource.in | sed -e 's/@NAME@/'xdg-icon-resource'/g' > xdg-icon-resource
awk -f generate-help-script.awk xdg-email.in | sed -e 's/@NAME@/'xdg-email'/g' > xdg-email
chmod a+x xdg-icon-resource
chmod a+x xdg-mime
chmod a+x xdg-email
awk -f generate-help-script.awk xdg-screensaver.in | sed -e 's/@NAME@/'xdg-screensaver'/g' > xdg-screensaver
awk -f generate-help-script.awk xdg-settings.in | sed -e 's/@NAME@/'xdg-settings'/g' > xdg-settings
awk -f generate-help-script.awk xdg-open.in | sed -e 's/@NAME@/'xdg-open'/g' > xdg-open
chmod a+x xdg-screensaver
chmod a+x xdg-open
chmod a+x xdg-settings
echo > README
rm xdg-mime.txt xdg-email.txt xdg-desktop-menu.txt xdg-screensaver.txt xdg-open.txt xdg-desktop-icon.txt xdg-icon-resource.txt xdg-settings.txt
make[1]: Leaving directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/scripts'
cd `dirname scripts/__install__` && make install
make[1]: Entering directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/scripts'
mkdir -p /home/djemos/xdg-utils/pkg/usr/bin
for x in xdg-desktop-menu xdg-desktop-icon xdg-mime xdg-icon-resource xdg-open xdg-email xdg-screensaver xdg-settings ; do \
    /usr/bin/ginstall -c   $x /home/djemos/xdg-utils/pkg/usr/bin ; \
done
mkdir -p /home/djemos/xdg-utils/pkg/usr/man
mkdir -p /home/djemos/xdg-utils/pkg/usr/man/man1
for x in man/xdg-desktop-menu.1 man/xdg-desktop-icon.1 man/xdg-mime.1 man/xdg-icon-resource.1 man/xdg-open.1 man/xdg-email.1 man/xdg-screensaver.1 man/xdg-settings.1 ; do \
    if [ -f $x ]; then \
        /usr/bin/ginstall -c  -m 644  $x /home/djemos/xdg-utils/pkg/usr/man/man1 ; \
    fi ; \
done
make[1]: Leaving directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/scripts'
cd `dirname tests/__install__` && make install
make[1]: Entering directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/tests'
make[1]: Nothing to be done for 'install'.
make[1]: Leaving directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/tests'
cd `dirname autotests/__install__` && make install
make[1]: Entering directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/autotests'
make[1]: Nothing to be done for 'install'.
make[1]: Leaving directory '/home/djemos/xdg-utils/src/xdg-utils-1.1.3/autotests'
/home/djemos/xdg-utils/pkg:
σύνολο 8
drwxr-xr-x 2 root root 4096 Μάι  18 01:34 install
drwxr-xr-x 6 root root 4096 Μάι  18 01:34 usr

/home/djemos/xdg-utils/pkg/install:
σύνολο 4
-rw-r--r-- 1 root root 553 Μάι  18 01:34 slack-desc

/home/djemos/xdg-utils/pkg/usr:
σύνολο 16
drwxr-xr-x 2 root root 4096 Μάι  18 01:34 bin
drwxr-xr-x 3 root root 4096 Μάι  18 01:34 doc
drwxr-xr-x 3 root root 4096 Μάι  18 01:34 man
drwxr-xr-x 3 root root 4096 Μάι  18 01:34 src

/home/djemos/xdg-utils/pkg/usr/bin:
σύνολο 280
-rwxr-xr-x 1 root root 21211 Μάι  18 01:34 xdg-desktop-icon
-rwxr-xr-x 1 root root 44568 Μάι  18 01:34 xdg-desktop-menu
-rwxr-xr-x 1 root root 27304 Μάι  18 01:34 xdg-email
-rwxr-xr-x 1 root root 30716 Μάι  18 01:34 xdg-icon-resource
-rwxr-xr-x 1 root root 42789 Μάι  18 01:34 xdg-mime
-rwxr-xr-x 1 root root 25779 Μάι  18 01:34 xdg-open
-rwxr-xr-x 1 root root 37885 Μάι  18 01:34 xdg-screensaver
-rwxr-xr-x 1 root root 38625 Μάι  18 01:34 xdg-settings

/home/djemos/xdg-utils/pkg/usr/doc:
σύνολο 4
drwxr-xr-x 2 root root 4096 Μάι  18 01:34 xdg-utils-1.1.3

/home/djemos/xdg-utils/pkg/usr/doc/xdg-utils-1.1.3:
σύνολο 16
-rw-r--r-- 1 root root 1087 Μάι  18 01:34 LICENSE
-rw-r--r-- 1 root root  328 Μάι  18 01:34 README
-rw-r--r-- 1 root root 3137 Μάι  18 01:34 RELEASE_NOTES
-rw-r--r-- 1 root root  805 Μάι  18 01:34 TODO

/home/djemos/xdg-utils/pkg/usr/man:
σύνολο 4
drwxr-xr-x 2 root root 4096 Μάι  18 01:34 man1

/home/djemos/xdg-utils/pkg/usr/man/man1:
σύνολο 36
-rw-r--r-- 1 root root 2674 Μάι  18 01:34 xdg-desktop-icon.1.gz
-rw-r--r-- 1 root root 4674 Μάι  18 01:34 xdg-desktop-menu.1.gz
-rw-r--r-- 1 root root 2126 Μάι  18 01:34 xdg-email.1.gz
-rw-r--r-- 1 root root 2835 Μάι  18 01:34 xdg-icon-resource.1.gz
-rw-r--r-- 1 root root 2893 Μάι  18 01:34 xdg-mime.1.gz
-rw-r--r-- 1 root root 1282 Μάι  18 01:34 xdg-open.1.gz
-rw-r--r-- 1 root root 1579 Μάι  18 01:34 xdg-screensaver.1.gz
-rw-r--r-- 1 root root 1682 Μάι  18 01:34 xdg-settings.1.gz

/home/djemos/xdg-utils/pkg/usr/src:
σύνολο 4
drwxr-xr-x 2 root root 4096 Μάι  18 01:34 xdg-utils-1.1.3

/home/djemos/xdg-utils/pkg/usr/src/xdg-utils-1.1.3:
σύνολο 8
-rw-r--r-- 1 root root 1235 Μάι  18 01:34 SLKBUILD
-rw-r--r-- 1 root root  705 Μάι  18 01:34 xdg-open_midori.patch

Slackware package maker, version 3.1415927.

Searching for symbolic links:

No symbolic links were found, so we won't make an installation script.
You can make your own later in ./install/doinst.sh and rebuild the
package if you like.

This next step is optional - you can set the directories in your package
to some sane permissions. If any of the directories in your package have
special permissions, then DO NOT reset them here!

Would you like to reset all directory permissions to 755 (drwxr-xr-x) and
directory ownerships to root.root ([y]es, [n]o)? n

Creating Slackware package:  /home/djemos/xdg-utils/xdg-utils-1.1.3-noarch-1dj.txz

./
usr/
usr/src/
usr/src/xdg-utils-1.1.3/
usr/src/xdg-utils-1.1.3/xdg-open_midori.patch
usr/src/xdg-utils-1.1.3/SLKBUILD
usr/bin/
usr/bin/xdg-settings
usr/bin/xdg-icon-resource
usr/bin/xdg-screensaver
usr/bin/xdg-desktop-menu
usr/bin/xdg-email
usr/bin/xdg-open
usr/bin/xdg-mime
usr/bin/xdg-desktop-icon
usr/man/
usr/man/man1/
usr/man/man1/xdg-desktop-icon.1.gz
usr/man/man1/xdg-desktop-menu.1.gz
usr/man/man1/xdg-mime.1.gz
usr/man/man1/xdg-settings.1.gz
usr/man/man1/xdg-open.1.gz
usr/man/man1/xdg-screensaver.1.gz
usr/man/man1/xdg-email.1.gz
usr/man/man1/xdg-icon-resource.1.gz
usr/doc/
usr/doc/xdg-utils-1.1.3/
usr/doc/xdg-utils-1.1.3/README
usr/doc/xdg-utils-1.1.3/RELEASE_NOTES
usr/doc/xdg-utils-1.1.3/TODO
usr/doc/xdg-utils-1.1.3/LICENSE
install/
install/slack-desc

Slackware package /home/djemos/xdg-utils/xdg-utils-1.1.3-noarch-1dj.txz created.

Package has been built.
Cleaning pkg and src directories