Please never call autotools directly, instead use eautoreconf (or eautomake, and JUST THESE TWO) from autotools.eclass. If you have any reason why those don't work, please let me know to fix them.
Reassigning back to herd since Stefan has been retired as a Gentoo Developer (#27693).
Created attachment 182073 [details, diff]
Patch switching to eautoreconf
Actually, only siproxd-0.5.11 is suffering of this bug.
This patch is fixing it.
But, in my opinion, as 0.5.11 is keyworded "~x86" and 0.5.13 and 0.7.0 are keyworded "amd64 x86", 0.5.11 ebuild could be simply removed.