[build2] Rerunning build2 and getting different results (errors)

[Boris Kolpackov]

Wilhelm Meier via users <users at build2.org> writes:

> The buildfile in /src/boards/protoboard/tests looks like:
> ---
> 
> l = ../../../libs
> 
> exe{test00}: cxx{test00} $l/std/lib{std} $l/mcu/general/lib{general}
> ---

This incorrect: you are using the targets (lib{std}, lib{general})
without including or importing their declarations. This is discussed
in detail in the manual, specifically in Target Importation:

https://build2.org/build2/doc/build2-build-system-manual.xhtml#intro-import