can't link sample MagickCore program

[jcupitt]

Hi, the intro to magickcore page has a simple example program:

http://www.imagemagick.org/script/magick-core.php

It suggests you compile with

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cc -o core core.c `pkg-config --cflags --libs MagickCore`

But with recent (6.9 and later? I'm trying 6.9.2-4) imagemagick, this fails with a lot of link errors along the lines of:

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/home/john/vips/lib/libMagickCore-6.Q16.so: undefined reference to `PixelSetQuantumColor'
/home/john/vips/lib/libMagickCore-6.Q16.so: undefined reference to `DrawSetClipRule'
.... etc.

What's the current recommended way to compile MagickCore programs?

This is on Ubuntu 15.10.