tar -xf xdg-utils-1.1.0-rc1.tar.gz
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- scripts/xdg-open.orig	2013-01-31 18:49:39.756213123 +0100
|+++ scripts/xdg-open	2013-01-31 18:53:11.944584990 +0100
--------------------------
patching file scripts/xdg-open
Using Plan A...
Hunk #1 succeeded at 526.
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: creating tests/Makefile
make[1]: Entering directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/scripts'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/scripts'
make[1]: Entering directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/tests'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/tests'
cd `dirname scripts/__install__` && make install
make[1]: Entering directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/scripts'
mkdir -p /tmp/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 /tmp/xdg-utils/pkg/usr/bin ; \
done
mkdir -p /tmp/xdg-utils/pkg/usr/man
mkdir -p /tmp/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 /tmp/xdg-utils/pkg/usr/man/man1 ; \
    fi ; \
done
make[1]: Leaving directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/scripts'
cd `dirname tests/__install__` && make install
make[1]: Entering directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/tests'
make[1]: Nothing to be done for `install'.
make[1]: Leaving directory `/tmp/xdg-utils/src/xdg-utils-1.1.0-rc1/tests'
/tmp/xdg-utils/pkg:
σύνολο 8
drwxr-xr-x 2 root root 4096 Φεβ   1 17:41 install
drwxr-xr-x 6 root root 4096 Φεβ   1 17:41 usr

/tmp/xdg-utils/pkg/install:
σύνολο 4
-rw-r--r-- 1 root root 553 Φεβ   1 17:41 slack-desc

/tmp/xdg-utils/pkg/usr:
σύνολο 16
drwxr-xr-x 2 root root 4096 Φεβ   1 17:41 bin
drwxr-xr-x 3 root root 4096 Φεβ   1 17:41 doc
drwxr-xr-x 3 root root 4096 Φεβ   1 17:41 man
drwxr-xr-x 3 root root 4096 Φεβ   1 17:41 src

/tmp/xdg-utils/pkg/usr/bin:
σύνολο 204
-rwxr-xr-x 1 root root 15560 Φεβ   1 17:41 xdg-desktop-icon
-rwxr-xr-x 1 root root 38159 Φεβ   1 17:41 xdg-desktop-menu
-rwxr-xr-x 1 root root 19274 Φεβ   1 17:41 xdg-email
-rwxr-xr-x 1 root root 24668 Φεβ   1 17:41 xdg-icon-resource
-rwxr-xr-x 1 root root 31987 Φεβ   1 17:41 xdg-mime
-rwxr-xr-x 1 root root 13619 Φεβ   1 17:41 xdg-open
-rwxr-xr-x 1 root root 23714 Φεβ   1 17:41 xdg-screensaver
-rwxr-xr-x 1 root root 25198 Φεβ   1 17:41 xdg-settings

/tmp/xdg-utils/pkg/usr/doc:
σύνολο 4
drwxr-xr-x 2 root root 4096 Φεβ   1 17:41 xdg-utils-1.1.0rc1

/tmp/xdg-utils/pkg/usr/doc/xdg-utils-1.1.0rc1:
σύνολο 16
-rw-r--r-- 1 root root 1087 Φεβ   1 17:41 LICENSE
-rw-r--r-- 1 root root 3865 Φεβ   1 17:41 README
-rw-r--r-- 1 root root 2819 Φεβ   1 17:41 RELEASE_NOTES
-rw-r--r-- 1 root root  782 Φεβ   1 17:41 TODO

/tmp/xdg-utils/pkg/usr/man:
σύνολο 4
drwxr-xr-x 2 root root 4096 Φεβ   1 17:41 man1

/tmp/xdg-utils/pkg/usr/man/man1:
σύνολο 36
-rw-r--r-- 1 root root 2691 Φεβ   1 17:41 xdg-desktop-icon.1.gz
-rw-r--r-- 1 root root 4609 Φεβ   1 17:41 xdg-desktop-menu.1.gz
-rw-r--r-- 1 root root 2030 Φεβ   1 17:41 xdg-email.1.gz
-rw-r--r-- 1 root root 2762 Φεβ   1 17:41 xdg-icon-resource.1.gz
-rw-r--r-- 1 root root 2774 Φεβ   1 17:41 xdg-mime.1.gz
-rw-r--r-- 1 root root 1160 Φεβ   1 17:41 xdg-open.1.gz
-rw-r--r-- 1 root root 1580 Φεβ   1 17:41 xdg-screensaver.1.gz
-rw-r--r-- 1 root root 1341 Φεβ   1 17:41 xdg-settings.1.gz

/tmp/xdg-utils/pkg/usr/src:
σύνολο 4
drwxr-xr-x 2 root root 4096 Φεβ   1 17:41 xdg-utils-1.1.0rc1

/tmp/xdg-utils/pkg/usr/src/xdg-utils-1.1.0rc1:
σύνολο 8
-rw-r--r-- 1 root root 1220 Φεβ   1 17:41 SLKBUILD
-rw-r--r-- 1 root root  443 Φεβ   1 17:41 xdg-open_midori.patch

Slackware package maker, version 3.14159.

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:  /tmp/xdg-utils/xdg-utils-1.1.0rc1-noarch-1dj.txz

./
install/
install/slack-desc
usr/
usr/doc/
usr/doc/xdg-utils-1.1.0rc1/
usr/doc/xdg-utils-1.1.0rc1/RELEASE_NOTES
usr/doc/xdg-utils-1.1.0rc1/LICENSE
usr/doc/xdg-utils-1.1.0rc1/README
usr/doc/xdg-utils-1.1.0rc1/TODO
usr/src/
usr/src/xdg-utils-1.1.0rc1/
usr/src/xdg-utils-1.1.0rc1/SLKBUILD
usr/src/xdg-utils-1.1.0rc1/xdg-open_midori.patch
usr/man/
usr/man/man1/
usr/man/man1/xdg-email.1.gz
usr/man/man1/xdg-open.1.gz
usr/man/man1/xdg-screensaver.1.gz
usr/man/man1/xdg-icon-resource.1.gz
usr/man/man1/xdg-desktop-icon.1.gz
usr/man/man1/xdg-settings.1.gz
usr/man/man1/xdg-mime.1.gz
usr/man/man1/xdg-desktop-menu.1.gz
usr/bin/
usr/bin/xdg-icon-resource
usr/bin/xdg-open
usr/bin/xdg-desktop-menu
usr/bin/xdg-screensaver
usr/bin/xdg-settings
usr/bin/xdg-desktop-icon
usr/bin/xdg-email
usr/bin/xdg-mime

Slackware package /tmp/xdg-utils/xdg-utils-1.1.0rc1-noarch-1dj.txz created.

Package has been built.
Cleaning pkg and src directories