Hello Vincent.
Your snippet works correctly on my system (debian unstalbe, m4 1.4.13,
autoconf 2.65).
Which version of m4 do you have? What happens if you change the definition
of `v_rev' to:
m4_define([v_rev], m4_esyscmd([(svnversion . | grep -v exported || echo 0) | awk -F : '{printf("%s", $][1);}' | tr 'A-z' ' ' | sed 's/ //g'
Regards,
Stefano
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