> With that out of the way, and lots of other stuff installed via Guix
> (gcc, glibc, guile, bzip2, sqlite, and perhaps a few more),
> "configure" runs to the end without complaining. But then "make" fails:

> make: *** No rule to make target `nix/libstore/schema.sql', needed by `nix/libstore/schema.sql.hh'.  Stop.

Could you try to run './bootstrap' before './configure && make && make
check'?