ImageMacgick6 seems to conflict with itself

[bob prohaska]

In trying to install ImageMagick6 on an RPI3 compilation finishes,
but installation stops with

===>  Installing for ImageMagick6-6.9.10.22_1,1
===>  Checking if ImageMagick6 is already installed
===>   Registering installation for ImageMagick6-6.9.10.22_1,1
Installing ImageMagick6-6.9.10.22_1,1...
pkg-static: ImageMagick6-6.9.10.22_1,1 conflicts with ImageMagick-6.9.9.28_2,1 (installs files into the same place).  Problematic file: /usr/local/bin/Magick++-config
*** Error code 70

The odd thing is that there is no /usr/local/bin/Magick++-config

Using 

make install FORCE_PKG_REGISTER=yes 
didn't help, is there something else I should try?

Thanks for reading,

bob prohaska