diff --git a/slackbuild/doinst.sh b/slackbuild/doinst.sh
new file mode 100644
index 00000000..1f7ce244
--- /dev/null
+++ b/slackbuild/doinst.sh
@@ -0,0 +1,19 @@
+config() {
+  NEW="$1"
+  OLD="$(dirname $NEW)/$(basename $NEW .new)"
+  if [ ! -r $OLD ]; then
+    mv $NEW $OLD
+  elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
+    rm $NEW
+  fi
+}
+
+CONFIGS="slpkg.conf repositories.conf blacklist slackware-mirrors default-repositories \
+    custom-repositories rlworkman.deps pkg_security"
+for file in $CONFIGS; do
+    config etc/slpkg/${file}.new
+done
+
+if [ -x /usr/bin/update-desktop-database ]; then
+  /usr/bin/update-desktop-database -q usr/share/applications >/dev/null 2>&1
+fi