There is also an installation script for CECSA (cecsa.sh) that can be used to install a complete compilation environment with all necessary compilers, tools and libraries under Termux. Installation is done in a few minutes now (depending on your internet speed).
https://sourceforge.net/projects/chess- ... oid/files/
To get a quick start I made a wiki entry "How to compile Stockfish with CECSA". A practical example is always a good idea.
https://sourceforge.net/p/chess-engines ... ith-cecsa/