libbctoolbox-dev 5.1.64-2 (armhf binary) in ubuntu lunar

 The package provides a C/C++ utility library used by Linphone and other
 software by Belledonne Communications. The library offers platform independent
 implementations of cryptographic functions, exception handling, logging
 modules, file access, unit tests and data structures like lists and maps.
 .
 The package is probably not useful outside the Belledonne Communications suite
 of libraries and programs.
 .
 This package contains the development headers.