Performing libtool configuration ...
. / configure: line 9904: syntax error near unexpected token `lt_decl_varnames, '
... which boiled down to:
. / configure: line 9904: `lt_if_append_uniq (lt_decl_varnames, SHELL,,, '
Fortunately, this thread was eventually resolved by someone finding out that they had some libtoo115 files left over, even though it had been deinstalled. I manually removed the extraneous files with:
# pkg_delete libtool-1.5.24
# rm -rf /usr/local/share/libtool15
# rm -f /usr/local/bin/libtool15 /usr/local/bin/libtoolize15
I am now back up and running!
Thanks to Vladislav Staroselskiy for a very helpful post about the FreeBSD apr1 libtool15 problem.