@b4n commented on this pull request.

In build/compat.m4:

> @@ -0,0 +1,18 @@
+dnl taken from Autoconf's m4sh.m4, GPLv3+
+m4_ifndef([AS_VAR_COPY], [
+m4_define([AS_VAR_COPY],
+[AS_LITERAL_WORD_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
+])

I'm not totally sure about this part: it might not be needed, and if it is I'm not sure AS_LITERAL_WORD_IF would be available. This code is what Autoconf has nowadays, but the inspiration I got from cryptsetup has AS_LITERAL_IF instead (but it seems to be buggy in some cases if I trust the documentation).
Anyway, we can fix this if a problem arises

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