failure: portupgrade -f 'autoconf*' 'automake*'

[Jan Henrik Sylvester]

===>   autoconf-2.61_1 is already installed
       You may wish to ``make deinstall'' and install this port again
       by ``make reinstall'' to upgrade it properly.
       If you really wish to overwrite the old port of devel/autoconf261
       without deleting it first, set the variable "FORCE_PKG_REGISTER"
       in your environment or the "make install" command line.
*** Error code 1

Stop in /usr/ports/devel/autoconf261.
*** Error code 1

Stop in /usr/ports/devel/automake19.
** Command failed [exit code 1]: /usr/bin/script -qa 
/tmp/portupgrade.3481.0 env UPGRADE_TOOL=portupgrade 
UPGRADE_PORT=automake-1.9.6_1 UPGRADE_PORT_VER=1.9.6_1 make
** Fix the problem and try again.
** Listing the failed packages (*:skipped / !:failed)
         ! devel/automake14 (automake-1.4.6_3)   (unknown build error)
         ! devel/automake19 (automake-1.9.6_1)   (unknown build error)
--->  Packages processed: 4 done, 0 ignored, 0 skipped and 2 failed