Issue #2505 has been updated by ftigeot.
I have rebuilt gcc47 with an additional fprintf() line
gcc apparently tries to compile /usr/include:
mkdep -f .depend -a -nostdinc -D_KERNEL -DKLD_MODULE -I. -I@
-I/usr/obj/usr/src/sys/X86_64_GENERIC
-I/usr/obj/usr/src/sys/X86_64_GENERIC/include
Issue #2480 has been updated by marino.
While waiting for new libdialog, MAX_LEN has been increased on old one:
http://gitweb.dragonflybsd.org/dragonfly.git/tree/c090922fe69732915227914768a9c4f9190fdece
Bug #2480: /usr/bin/dialog buffer size too small