In /usr/bin/GraphicsMagickWand-config line 10:
usage='Usage: GraphicsMagickWand-config [--cflags] [--cppflags] [--exec-prefix] [--ldflags] [--libs] [--prefix] [--version]
      ^-- SC2016: Expressions don't expand in single quotes, use double quotes for that.


In /usr/bin/GraphicsMagickWand-config line 33:
      echo "`GraphicsMagick-config --cflags`"
           ^-- SC2005: Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.
            ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
      echo "$(GraphicsMagick-config --cflags)"


In /usr/bin/GraphicsMagickWand-config line 36:
      echo "`GraphicsMagick-config --cppflags`"
           ^-- SC2005: Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.
            ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
      echo "$(GraphicsMagick-config --cppflags)"


In /usr/bin/GraphicsMagickWand-config line 39:
      echo "`GraphicsMagick-config --ldflags`"
           ^-- SC2005: Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.
            ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
      echo "$(GraphicsMagick-config --ldflags)"


In /usr/bin/GraphicsMagickWand-config line 42:
      echo "-lGraphicsMagickWand `GraphicsMagick-config --libs`"
                                 ^----------------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
      echo "-lGraphicsMagickWand $(GraphicsMagick-config --libs)"

For more information:
  https://www.shellcheck.net/wiki/SC2016 -- Expressions don't expand in singl...
  https://www.shellcheck.net/wiki/SC2005 -- Useless echo? Instead of 'echo $(...
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...