[Bug 220591] graphics/graphviz: fails to build on armv6 (451 ports skipped)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220591

--- Comment #3 from Jan Beich <jbeich at FreeBSD.org> ---
Comment on attachment 184219
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=184219
patch-lib-common-shapes.c

Doesn't help:

  $ make
  checking for sincos... no
  [...]
  ../../lib/gvc/.libs/libgvc.so: undefined reference to `sincos'
  cc: error: linker command failed with exit code 1 (use -v to see invocation)
  [...]
  ../../plugin/neato_layout/.libs/libgvplugin_neato_layout.so: undefined
reference to `sincos'
  cc: error: linker command failed with exit code 1 (use -v to see invocation)

I've also tried adding

  # Bug 220590: -ffast-math is broken without sincos in libm
  CFLAGS_armv6= -fno-unsafe-math-optimizations

but it doesn't help due to the order of CFLAGS on command line.

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