"kicad" build fails on netbsd-9/i386

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

Building "cad/kicad" fails on netbsd-9/i386 (up-to-date 9.2_STABLE on
amd64 hardware) as follows:

[...]
[ 91%] Linking CXX executable kicad
ld: ../common/libgal.a(wx_view_controls.cpp.o): in function `KIGFX::WX_VIEW_CONTROLS::onMotion(wxMouseEvent&)':
wx_view_controls.cpp:(.text+0x314f): undefined reference to `__atomic_fetch_add_8'
ld: pcm/libpcm.a(dialog_pcm_progress.cpp.o): in function `DIALOG_PCM_PROGRESS::AdvancePhase()':
dialog_pcm_progress.cpp:(.text+0x6c): undefined reference to `__atomic_store_8'
ld: pcm/libpcm.a(dialog_pcm_progress.cpp.o): in function `DIALOG_PCM_PROGRESS::SetDownloadProgress(unsigned long long, unsigned long long)':
dialog_pcm_progress.cpp:(.text+0xcd): undefined reference to `__atomic_store_8'
ld: dialog_pcm_progress.cpp:(.text+0xee): undefined reference to `__atomic_store_8'
ld: pcm/libpcm.a(dialog_pcm_progress.cpp.o): in function `DIALOG_PCM_PROGRESS::SetPackageProgress(unsigned long long, unsigned long long)':
dialog_pcm_progress.cpp:(.text+0x16b): undefined reference to `__atomic_store_8'
ld: dialog_pcm_progress.cpp:(.text+0x18c): undefined reference to `__atomic_store_8'
ld: pcm/libpcm.a(dialog_pcm_progress.cpp.o): in function `DIALOG_PCM_PROGRESS::updateUI()':
dialog_pcm_progress.cpp:(.text+0x221): undefined reference to `__atomic_load_8'
ld: dialog_pcm_progress.cpp:(.text+0x242): undefined reference to `__atomic_load_8'
ld: dialog_pcm_progress.cpp:(.text+0x30e): undefined reference to `__atomic_load_8'
ld: dialog_pcm_progress.cpp:(.text+0x623): undefined reference to `__atomic_load_8'
ld: dialog_pcm_progress.cpp:(.text+0x65a): undefined reference to `__atomic_load_8'
ld: pcm/libpcm.a(dialog_pcm_progress.cpp.o):dialog_pcm_progress.cpp:(.text+0xa60): more undefined references to `__atomic_load_8' follow
*** [kicad/kicad] Error code 1

make[2]: stopped in /tmp/pkgsrc/cad/kicad/work/kicad-6.0.2
1 error

make[2]: stopped in /tmp/pkgsrc/cad/kicad/work/kicad-6.0.2
*** [kicad/CMakeFiles/kicad.dir/all] Error code 2

make[1]: stopped in /tmp/pkgsrc/cad/kicad/work/kicad-6.0.2
1 error

make[1]: stopped in /tmp/pkgsrc/cad/kicad/work/kicad-6.0.2
*** [all] Error code 2

make: stopped in /tmp/pkgsrc/cad/kicad/work/kicad-6.0.2
1 error

make: stopped in /tmp/pkgsrc/cad/kicad/work/kicad-6.0.2
*** Error code 2

Stop.
make[1]: stopped in /x/pkgsrc/cad/kicad
*** Error code 1

Stop.
make: stopped in /x/pkgsrc/cad/kicad

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