...
file=./`echo hy | sed 's,.*/,,'`.gmo \
          && rm -f $file && /home/marko/prefix/bin/msgfmt -c -o $file hy.po
hy.po:160: number of format specifications in 'msgid' and 'msgstr[1]' does not match
/home/marko/prefix/bin/msgfmt: found 1 fatal error
make[2]: *** [hy.gmo] Error 1
make[2]: Leaving directory `/home/marko/cvs/gnome2/2.18/gtk+/po'

That line is:

msgstr[1] ""

which should be a translation of

msgid "failed to allocate image buffer of %u byte"
msgid_plural "failed to allocate image buffer of %u bytes"

(so it's lacking a '%u', at least)

I just copied the string from msgstr[0] to continue with the build, but I don't know the language, so the person in charge should change this accordingly.