graphics/inkscape build fails on NetBSD/i386

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

Building "graphics/inkscape" fails on NetBSD/i386 (9.1_STABLE and -current)
with:

[...]
[ 98%] Linking CXX shared library ../lib/libinkscape_base.so
ld: cannot find -latomic
--- lib/libinkscape_base.so ---
*** [lib/libinkscape_base.so] Error code 1

make[2]: stopped in /d0/build/pkgsrc/graphics/inkscape/work/inkscape-1.0.1_2020-09-07_3bc2e813f5
1 error

make[2]: stopped in /d0/build/pkgsrc/graphics/inkscape/work/inkscape-1.0.1_2020-09-07_3bc2e813f5
--- src/CMakeFiles/inkscape_base.dir/all ---
*** [src/CMakeFiles/inkscape_base.dir/all] Error code 2

make[1]: stopped in /d0/build/pkgsrc/graphics/inkscape/work/inkscape-1.0.1_2020-09-07_3bc2e813f5
1 error

make[1]: stopped in /d0/build/pkgsrc/graphics/inkscape/work/inkscape-1.0.1_2020-09-07_3bc2e813f5
*** [all] Error code 2

make: stopped in /d0/build/pkgsrc/graphics/inkscape/work/inkscape-1.0.1_2020-09-07_3bc2e813f5
1 error

make: stopped in /d0/build/pkgsrc/graphics/inkscape/work/inkscape-1.0.1_2020-09-07_3bc2e813f5
*** Error code 2

Stop.
make[1]: stopped in /x/pkgsrc/graphics/inkscape
*** Error code 1

Stop.
make: stopped in /x/pkgsrc/graphics/inkscape


Why it didn't fail earlier, such as during the configure phase, I don't
know.

Will try the "-march=i586" hack on it first, then ???

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