This script will download and build the kernel for you. Be sure to specify the
correct variables.

-------------------------------------------------------------------------------

#!/bin/sh
SLACKMIRROR="https://mirror.yandex.ru/slackware/slackware64-current/"
KERNMIRROR="/source/k618/"
KERNSRC="/tmp/k"
KERNOUT="/tmp/kernels"

set -e

rm -rf $KERNSRC $KERNOUT
mkdir -p $KERNSRC $KERNOUT
cd $KERNSRC
lftp -c "mirror ${SLACKMIRROR}${KERNMIRROR} ."
KERNVER=$(ls *.xz|sed -e 's/linux-//' -e 's/.tar.xz//')
chmod +x *.SlackBuild build-all-kernels.sh

sed -i 's/oldconfig/olddefconfig/g' kernel-generic.SlackBuild
sed -i 's/oldconfig/olddefconfig/g' kernel-source.SlackBuild
time TMP=$KERNOUT INSTALL_PACKAGES=NO sh ./build-all-kernels.sh

cd $KERNOUT/output-x86_64-$KERNVER
installpkg kernel-{generic,modules,source}-*.txz
upgradepkg kernel-headers*.txz

lftp -c "mget ${SLACKMIRROR}/slackware64/a/kernel-firm*.txz"
upgradepkg kernel-firmware*.txz

geninitrd && grub-mkconfig -o /boot/grub/grub.cfg