GraphicsMagick is a replacement for ImageMagick. Now media-gfx/autotrace depends only on media-gfx/imagemagick.
Sorry about the mass reassignment, but this undertaking really shouldn't burden bug-wranglers further.
snip from configure.in: MAGICK_LDFLAGS="`pkg-config --libs ImageMagick`" MAGICK_CFLAGS="`pkg-config --cflags ImageMagick`" in files/autotrace-0.31.1-GetOnePixel.patch is upgrading to latest imagemagick api then the lib links to libMagickCore.so therefore closing this bug