Build failure for emulators/qemu

[Paul Goyette <paul%whooppee.com@localhost>]

On a amd64 build host running NetBSD-9.99.4, and with pkgsrc updated
as of 2019-08-13 at 15:56:51 UTC, I am getting the following error
while trying to build qemu-4.0.0nb9.  (It would appear that during
the configure phase it is trying to include something related to
documentation, and the error message would imply that additional
packages might need to be installed - shouldn't that be handled by
the usual pkgsrc dependency mechanism?)

===> Cleaning for qemu-4.0.0nb9
=> Bootstrap dependency digest>=20010302: found digest-20190127
=> Checksum SHA1 OK for qemu-4.0.0.tar.xz
=> Checksum RMD160 OK for qemu-4.0.0.tar.xz
=> Checksum SHA512 OK for qemu-4.0.0.tar.xz
===> Installing dependencies for qemu-4.0.0nb9
==========================================================================
The supported build options for qemu are:

	gtk3 sdl

The currently selected options are:

	sdl

You can select which build options to use by setting PKG_DEFAULT_OPTIONS
or the following variable.  Its current value is shown:

	PKG_OPTIONS.qemu (not defined)

==========================================================================
==========================================================================
The following variables will affect the build process of this package,
qemu-4.0.0nb9.  Their current value is shown below:

        * CURSES_DEFAULT = curses
        * JPEG_DEFAULT = jpeg
        * KRB5_DEFAULT = heimdal
        * PYTHON_VERSION_DEFAULT = 37
        * SSLBASE = /usr
        * SSLCERTS = /etc/openssl/certs
        * SSLDIR = /etc/openssl
        * SSLKEYS = /etc/openssl/private

Based on these variables, the following variables have been set:

        * CURSES_TYPE = curses
        * JPEGBASE (defined, but empty)
        * JPEG_TYPE = jpeg
        * KRB5BASE (defined, but empty)
        * KRB5_TYPE = heimdal
        * PYPACKAGE = python37

You may want to abort the process now with CTRL-C and change their value
before continuing.  Be sure to run `/usr/bin/make clean' after
the changes.
==========================================================================
=> Tool dependency py37-sphinx-[0-9]*: found py37-sphinx-1.8.5
=> Tool dependency glib2-tools-[0-9]*: found glib2-tools-2.60.4
=> Tool dependency bison>=1.0: found bison-3.2.4nb1
=> Tool dependency gmake>=3.81: found gmake-4.2.1nb1
=> Tool dependency perl>=5.0: found perl-5.30.0
=> Tool dependency pkgconf-[0-9]*: found pkgconf-1.6.0
=> Build dependency x11-links>=1.24: found x11-links-1.24
=> Build dependency cwrappers>=20150314: found cwrappers-20180325
=> Full dependency SDL2>=2.0.3nb8: found SDL2-2.0.10
=> Full dependency lzo>=2.01: found lzo-2.10
=> Full dependency glib2>=2.34.0: found glib2-2.60.4nb5
=> Full dependency jemalloc>=4.0.0: found jemalloc-5.2.1nb1
=> Full dependency snappy>=1.0.5: found snappy-1.1.7
=> Full dependency hicolor-icon-theme>=0.9nb1: found hicolor-icon-theme-0.17
=> Full dependency png>=1.6.0nb1: found png-1.6.37
=> Full dependency python37>=3.7.0: found python37-3.7.4
=> Full dependency libgcrypt>=1.6.0: found libgcrypt-1.8.4
=> Full dependency curl>=7.65.3nb1: found curl-7.65.3nb2
=> Full dependency jpeg>=9: found jpeg-9cnb1
===> Overriding tools for qemu-4.0.0nb9
===> Extracting for qemu-4.0.0nb9
===> Patching for qemu-4.0.0nb9
=> Applying pkgsrc patches for qemu-4.0.0nb9
===> Creating toolchain wrappers for qemu-4.0.0nb9
===> Configuring for qemu-4.0.0nb9
=> Setting PREFIX
INFO: [subst.mk:prefix] Nothing changed in ./configure.
=> Fix hardcoded sphinx-build
=> Generating pkg-config file for builtin expat package.
=> Replacing Perl interpreter in scripts/texi2pod.pl.

ERROR: User requested feature docs
       configure was not able to find it.
       Install texinfo, Perl/perl-podlators and python-sphinx

*** Error code 1

Stop.
make[1]: stopped in /build/pkgsrc/emulators/qemu
*** Error code 1

Stop.
make: stopped in /build/pkgsrc/emulators/qemu


+--------------------+--------------------------+-----------------------+
| Paul Goyette       | PGP Key fingerprint:     | E-mail addresses:     |
| (Retired)          | FA29 0E3B 35AF E8AE 6651 | paul%whooppee.com@localhost     |
| Software Developer | 0786 F758 55DE 53BA 7731 | pgoyette%netbsd.org@localhost   |
+--------------------+--------------------------+-----------------------+