games/enigma build fails

["John D. Baker" <jdbaker%consolidated.net@localhost>]

Getting a head start before the freeze leading to pkgsrc-2023Q4, I've
updated to pkgsrc-HEAD and have updated packages--except games/enigma.

This is on NetBSD/amd64-9.3_STABLE using pkgsrc GCC-10 as pkgsrc compiler.
(Updates on NetBSD/amd64-HEAD are in progress and have not yet reached
games/enigma.)

"games/enigma" fails building as follows:

[...]
Making all in images
gmake[3]: Entering directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images'
/usr/pkg/bin/convert -density 112x112 -units PixelsPerCentimeter -crop 60x60+0+0 /tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_bug.png ac_bug.png
/usr/pkg/bin/convert -density 112x112 -units PixelsPerCentimeter -crop 60x60+0+0 /tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_horse.png ac_horse.png
/usr/pkg/bin/convert -density 112x112 -units PixelsPerCentimeter -crop 60x60+0+0 /tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_marble_black.png ac_marble_black.png
/usr/pkg/bin/convert -density 112x112 -units PixelsPerCentimeter -crop 60x60+0+0 /tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_marble_white.png ac_marble_white.png
/usr/pkg/bin/convert -density 112x112 -units PixelsPerCentimeter -crop 60x60+0+0 /tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_pearl_black.png ac_pearl_black.png
convert: unable to read image data `/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_marble_black.png' @ error/constitute.c/ReadImage/991convert: unable to read image data `/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_horse.png' @ error/constitute.c/ReadImage/991convert: unable to read image data `/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_pearl_black.png' @ error/constitute.c/ReadImage/991convert: unable to read image data `/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_marble_white.png' @ error/constitute.c/ReadImage/991.
.
convert: no images defined `ac_pearl_black.png' @ error/convert.c/ConvertImageCommand/3362.
convert: no images defined `ac_marble_white.png' @ error/convert.c/ConvertImageCommand/3362.
.
convert: no images defined `ac_horse.png' @ error/convert.c/ConvertImageCommand/3362.
.
convert: no images defined `ac_marble_black.png' @ error/convert.c/ConvertImageCommand/3362.
convert: unable to read image data `/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images/../../../data/gfx48/ac_bug.png' @ error/constitute.c/ReadImage/991.
convert: no images defined `ac_bug.png' @ error/convert.c/ConvertImageCommand/3362.
gmake[3]: *** [Makefile:805: ac_bug.png] Error 1
gmake[3]: *** Waiting for unfinished jobs....
gmake[3]: *** [Makefile:805: ac_horse.png] Error 1
gmake[3]: *** [Makefile:805: ac_marble_white.png] Error 1
gmake[3]: *** [Makefile:805: ac_pearl_black.png] Error 1
gmake[3]: *** [Makefile:805: ac_marble_black.png] Error 1
gmake[3]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference/images'
gmake[3]: Entering directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference'
gmake[3]: Nothing to be done for 'all-am'.
gmake[3]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference'
gmake[2]: *** [Makefile:345: all-recursive] Error 1
gmake[2]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc/reference'
gmake[2]: Entering directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc'
gmake[2]: Nothing to be done for 'all-am'.
gmake[2]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc'
gmake[1]: *** [Makefile:406: all-recursive] Error 1
gmake[1]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/doc'
Making all in po
gmake[1]: Entering directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/po'
gmake[1]: Nothing to be done for 'all'.
gmake[1]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/po'
Making all in etc
gmake[1]: Entering directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/etc'
gmake[1]: Nothing to be done for 'all'.
gmake[1]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21/etc'
gmake[1]: Entering directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21'
gmake[1]: Nothing to be done for 'all-am'.
gmake[1]: Leaving directory '/tmp/pkgsrc/games/enigma/work/enigma-1.21'
gmake: *** [Makefile:368: all-recursive] Error 1
*** Error code 2

Stop.
make[1]: stopped in /x/pkgsrc/games/enigma
*** Error code 1

Stop.
make: stopped in /x/pkgsrc/games/enigma


I saw something similar a couple of years ago when the build process
complained about broken image files due to updated PNG library being more
strict.

Perhaps that has happened again?

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