# installboot -v -o console=com0,speed=0 /dev/rwd0a bootxx_ffsv1
File system:         /dev/rwd0a
Primary bootstrap:   bootxx_ffsv1
Boot options:        timeout 5, flags 0, speed 0, ioaddr 0, console com0
# installboot -v -o console=com0,speed=0 /dev/rwd0a bootxx_ffsv1 boot
File system:         /dev/rwd0a
File system type:    ffs (blocksize 8192, needswap 0)
Primary bootstrap:   bootxx_ffsv1
Secondary bootstrap: boot
Boot options:        timeout 5, flags 0, speed 0, ioaddr 0, console com0

The reason of taking time to start xdm, we see following message

pckbport: command timeout
pms_enable: command error 35
pckbport: command timeout
pckbport: command timeout
pms_disable: command error
pckbport: command timeout
pms_enable: command error 35
pckbport: command timeout
pms_disable: command error
pckbport: command timeout
pms_enable: command error 35
pckbport: command timeout
pckbport: command timeout
pckbport: command timeout

genova# (cd /usr/pkgsrc/wip/apel-git; make package)
make: "../../editors/emacs/../../editors/emacs/modules.mk" line 287: Cannot open /version.mk
make: Fatal errors encountered -- cannot continue
make: stopped in /usr/pkgsrc/wip/apel-git
genova# 

Just EMACS_TYPE was wrong, was just 25, but emacs25 is correct.

to the PKG_CONFIG_PATH environment variable
No package 'xorg-macros' found
checking whether make supports nested variables... (cached) yes
checking for floor in -lm... yes
checking for XRANDR... configure: error: Package requirements
   (xrandr >= 1.4 xrender x11 xproto >= 7.0.17) were not met:

Requested 'xrandr >= 1.4' but version of Xrandr is 1.3.2

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables XRANDR_CFLAGS
and XRANDR_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/x11/xrandr
*** Error code 1

Is following related ?