/usr/lib/x86_64-linux-gnu/pkgconfig/Magick++.pc is in libmagick++-dev 8:6.7.7.10-5+deb7u4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/ImageMagick
Name: Magick++
Version: 6.7.7
Description: Magick++ - C++ API for ImageMagick
Requires: ImageMagick
Libs: -L${libdir} -lMagick++
Cflags: -I${includedir}
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