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

git clone https://github.com/plougher/squashfs-tools

cd squashfs-tools/squashfs-tools

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

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

Edit Makefile
XZ_SUPPORT = 1
LZO_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"

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