src/config/pre.in uses @localedir@ in the definition of KRB5_LOCALEDIR. This variable was added in autoconf 2.60, but we only require autoconf 2.52 in our AC_PREREQ. There are several choices for fixing this: we could start requiring autoconf 2.60, we could use $(datadir)/locale instead of @localedir@ in the definition of KRB_LOCALEDIR, or we could make configure.in define localedir for autoconf 2.5x.