This one is new to me - ports failing to install their dependencies

[Torfinn Ingolfsen]

It started when I tried to upgrade the audacity port. Partial output:
===>  Applying FreeBSD patches for audacity-2.1.2_3
===>   audacity-2.1.2_3 depends on executable: autogen - found
===>   audacity-2.1.2_3 depends on executable: bash - found
===>   audacity-2.1.2_3 depends on executable: cmake - found
===>   audacity-2.1.2_3 depends on executable: docbook-to-man - found
===>   audacity-2.1.2_3 depends on executable: docbook2man - not found
===>   docbook-utils-0.6.14_13 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by docbook-utils-0.6.14_13 for building
===>  Extracting for docbook-utils-0.6.14_13
=> SHA256 Checksum OK for docbook-utils-0.6.14.tar.gz.
===>  Patching for docbook-utils-0.6.14_13
===>  Applying FreeBSD patches for docbook-utils-0.6.14_13
===>   docbook-utils-0.6.14_13 depends on package: docbook-sgml>0 - found
===>   docbook-utils-0.6.14_13 depends on package:
dsssl-docbook-modular>0 - found
===>   docbook-utils-0.6.14_13 depends on executable: nsgmls - found
===>   docbook-utils-0.6.14_13 depends on executable: jadetex - not found
===>   docbook-utils-0.6.14_13 depends on executable: jadetex - not found
*** [build-depends] Error code 1

Stop in /usr/ports/textproc/docbook-utils.
*** [build-depends] Error code 1

Stop in /usr/ports/audio/audacity.
*** [stage] Error code 1

Stop in /usr/ports/audio/audacity.

Ok, let's try to install the docbook-utils port then:

root at kg-core1# portinstall -R docbook-utils
[Reading data from pkg(8) ... - 836 packages found - done]
--->  Installing 'docbook-utils-0.6.14_13' from a port (textproc/docbook-utils)
--->  Building '/usr/ports/textproc/docbook-utils'
===>  Cleaning for tex-jadetex-3.13_3
===>  Cleaning for docbook-utils-0.6.14_13
===>   docbook-utils-0.6.14_13 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by docbook-utils-0.6.14_13 for building
===>  Extracting for docbook-utils-0.6.14_13
=> SHA256 Checksum OK for docbook-utils-0.6.14.tar.gz.
===>  Patching for docbook-utils-0.6.14_13
===>  Applying FreeBSD patches for docbook-utils-0.6.14_13
===>   docbook-utils-0.6.14_13 depends on package: docbook-sgml>0 - found
===>   docbook-utils-0.6.14_13 depends on package:
dsssl-docbook-modular>0 - found
===>   docbook-utils-0.6.14_13 depends on executable: nsgmls - found
===>   docbook-utils-0.6.14_13 depends on executable: jadetex - not found
===>   tex-jadetex-3.13_3 depends on file: /usr/local/sbin/pkg - found
===> Fetching all distfiles required by tex-jadetex-3.13_3 for building
===>  Extracting for tex-jadetex-3.13_3
=> SHA256 Checksum OK for TeX/texlive-20150523-texmf.tar.xz.
===>  Patching for tex-jadetex-3.13_3
===>   tex-jadetex-3.13_3 depends on file:
/usr/local/share/texmf-var/web2c/tex/tex.fmt - not found
===>   tex-jadetex-3.13_3 depends on file:
/usr/local/share/texmf-var/web2c/tex/tex.fmt - not found
*** [build-depends] Error code 1

Stop in /usr/ports/print/tex-jadetex.
*** [build-depends] Error code 1

Stop in /usr/ports/textproc/docbook-utils.
** Command failed [exit code 1]: /usr/bin/script -qa
/tmp/portinstall20160325-19943-4m5e2s env make
** Fix the problem and try again.
** Listing the failed packages (-:ignored / *:skipped / !:failed)
    ! textproc/docbook-utils    (unknown build error)

What's going on?
Any idea?
-- 
Regards,
Torfinn Ingolfsen