Previous extension here:
http://tinycorelinux.net/10.x/x86_64/tcz/mosh.tcz.info
http://tinycorelinux.net/10.x/x86_64/tcz/src/mosh/mosh.tcz.build-dep
version 1.3.2+ (commit b1da700)
Current release version is still 1.3.2, I won't use the Git commits.

From homepage (https://mosh.org):
---
Dependencies

Name				Typical package
Perl (5.14 or newer)		perl
Protocol Buffers		protobuf-compiler, libprotobuf-dev
ncurses				libncurses5-dev
zlib				zlib1g-dev
utempter (optional)		libutempter-dev
OpenSSL				libssl-dev
---
* Install extensions:  compiletc squashfs-tools perl5 ncursesw-dev zlib_base-dev openssl-1.1.1-dev protobuf-dev
* export CFLAGS="-mtune=generic -Os -pipe" CXXFLAGS="-mtune=generic -Os -pipe" LDFLAGS="-Wl,-O1" PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
* ./configure --prefix=/usr/local
  - "--enable-static-protobuf" option used by previous packager not recognised.
* make
* sudo make DESTDIR=/tmp/mosh install-strip
* split /tmp/mosh into directories:  mosh mosh-doc

* sudo chown -R root:root mosh*
* In each dir. run "find usr ! -type d | sed "s/^/\//g" > ../mosh.tcz.list".
 - for dir in `find -maxdepth 1 -mindepth 1 -type d`; do cd $dir; find usr ! -type d | sed "s/^/\//g" > ../$dir.tcz.list; cd ..; done
* Make into extensions using mksquashfs. "mksquashfs mosh mosh.tcz"
  "md5sum mosh.tcz > mosh.tcz.md5.txt" etc...
 - for dir in `find -maxdepth 1 -mindepth 1 -type d`; do mksquashfs $dir ${dir#./}.tcz; md5sum ${dir#./}.tcz > ${dir#./}.tcz.md5.txt; done
* Make mosh.tcz.dep:

Deps:
ncursesw.tcz
openssl-1.1.1.tcz
perl5.tcz
protobuf.tcz

* tce-load -i mosh.tcz
* mosh [user]@[hostname]
 - If locale not UTF-8, load local ext. (mylocale.sh) and start like: LANG=en_AU.utf8 mosh [user]@[hostname]
* Also start ssh server and test connecting from another system.