tce-load -i compiletc liblzma-dev lzo-dev zstd-dev liblz4-dev zlib_base-dev

https://github.com/plougher/squashfs-tools/archive/4.4.tar.gz

cd squashfs-tools-4.4

cd squashfs-tools

patch -N -i '../../squashfs-tools-fix build failure against gcc-10.patch'
patch -N -i '../../squashfs-tools_block_size.patch'

Edit Makefile
XZ_SUPPORT = 1
LZO_SUPPORT = 1
LZ4_SUPPORT = 1
ZSTD_SUPPORT = 1
INSTALL_DIR ?=.....
CFLAGS ?=

make -j4 CC="gcc -march=armv8-a+crc -mtune=cortex-a72  -Os -pipe" \
CXX="g++ -march=armv8-a+crc -mtune=cortex-a53 -Os -pipe -fno-exceptions -fno-rtti"

make CC="gcc -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" \
CXX="g++ -march=armv8-a+crc -mtune=cortex-a53 -Os -pipe -fno-exceptions -fno-rtti" \
INSTALL_DIR=/tmp/squashfs-tools/usr/local/bin install


EXTNAM=squashfs-tools
TMPDIR=/tmp/squashfs-tools

# Adjust directory access rigths

find $TMPDIR/ -type d | xargs chmod -v 755;

# Strip executables

find $TMPDIR | xargs file | grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded

###################################################
# Create base extension in temp dir               #
###################################################

cd $TMPDIR
cd ..
mksquashfs $TMPDIR $EXTNAM.tcz
cd $TMPDIR
find usr -not -type d > $EXTNAM.tcz.list
mv ../$EXTNAM.tcz .

# Create md5 file

md5sum $EXTNAM.tcz > $EXTNAM.tcz.md5.txt

# Cleanup temp directory

rm -r -f usr