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

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

cd squashfs-tools-4.4

patch -Np2 -i ../squashfs-tools_block_size.patch
patch -Np2 -i ../squashfs-tools_perms.patch
patch -Np1 -i ../squashfs-tools_xattr.patch

cd squashfs-tools

[sed -i 's@attr/xattr.h@sys/xattr.h@' *.c]

Edit Makefile
XZ_SUPPORT = 1
LZO_SUPPORT = 1
LZ4_SUPPORT = 1
ZSTD_SUPPORT = 1
#XATTR_SUPPORT = 1
CFLAGS ?=

make CC="gcc -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" [0m 6.79s]

sudo make CC="gcc -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" install