/usr/lib/x86_64-linux-gnu/pkgconfig/ImageMagick.pc is in libmagickcore-6.q16-dev 8:6.8.9.9-5+deb8u12.
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 13 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include/ImageMagick-6
includearchdir=/usr/include/x86_64-linux-gnu//ImageMagick-6
libname=MagickCore-6.Q16
Name: ImageMagick
Description: ImageMagick - Convert, Edit, and Compose Images (ABI Q16)
Version: 6.8.9
Libs: -L${libdir} -l${libname}
Libs.private: -L${libdir} -l${libname} -llcms2 -lfreetype -llqr-1 -lglib-2.0 -lfftw3 -lfontconfig -lfreetype -lXext -lSM -lICE -lX11 -lXt -llzma -lbz2 -lz -lltdl -lm -lgomp -lm
Cflags: -I${includearchdir} -I${includedir} -fopenmp -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16
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