what i can tell from andras' output, is that he seems to try to compile
Pd-extended-0.41.
this version is a branch of the repository that might well not have
x86_64 fixes everywhere.

thus i recommend:

i guess you should upgrade to the latest and greatest version of iem_tab.

Ah yes, this option would be the preferred route forward:

svn checkout https://pure-data.svn.sourceforge.net/svnroot/trunk pure-data
cd pure-data
rm -r pd
svn checkout https://pure-data.svn.sourceforge.net/svnroot/pure-data/branches/pd-extended/0.42/pd

Then build as usual.

.hc