Jan Nieuwenhuizen writes:

Fix for

    ./pre-inst-env guix build --target=mips64el-linux-gnuabi64 hello

attached.  Adds srfi-26 to glibc for cut.

As Andy suggested I will be factoring-out the for-each (setenv) CROSS_*
stanzas but I'm still experimenting with that, with cross-libtool and
the whole lilypond stack.

Greetings,
Jan