Hello, I am the author of a new implementation of POSIX bc. ( https://github.com/gavinhoward/bc) It has all GNU extensions, so it can be used to build the Linux kernel. In fact, it can be a drop-in replacement for the GNU bc.
While I believe that my bc is robust enough to be used as the default bc on Arch, I am under no illusion that that will happen right away, if at all. Instead, I have made a PKGBUILD (attached) for my bc as an alternative. It installs alongside the GNU bc without problem, since it is renamed as "bc-gh". This also includes a dc under "dc-gh". Would there be interest in adding my bc as an Arch package? Gavin Howard
PKGBUILD
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