You need the following tools to fully work on tcsh development.
autoconfgettext(forAM_ICONVinshare/aclocal/intl.m4)
The autoconf scripts on Debian add a --runstatedir option
to configured that we don't have in the tcsh repository,
due to running autoreconf on NetBSD.
Install gettext to get AM_ICONV. The gettext-base package
does not include the needed files in /usr/share/aclocal.
Install pkgsrc/devel/gettext-m4 to get AM_ICONV.