x86 extension build script here:
http://tinycorelinux.net/9.x/x86/tcz/src/protobuf/protobuf.build

* Install extensions:  compiletc squashfs-tools libtool-dev

Get latest protobuf-cpp release from:
https://github.com/protocolbuffers/protobuf/releases/
* 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
* make
 - Slow
* sudo make DESTDIR=/tmp/protobuf install-strip
* split /tmp/protobuf into   protobuf-dev protobuf

* In each dir. run "find usr ! -type d | sed "s/^/\//g" > ../protobuf.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 protobuf protobuf.tcz
  "md5sum protobuf.tcz > protobuf.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