ImageMagick: CImg.h: In member function 'cimg_library::CImg<T>& cimg_library::CImg<T>::load_magick(const char*)':

[vt-alt]

README says GraphicsMagick is supported as well as ImageMagick. Examples using GraphicsMagick for cimg_use_magick though, which is a different library.

# Flags to enable native support of most classical image file formats, using the Magick++ library.
# ( http://www.imagemagick.org/Magick++/ )
MAGICK_DEFINE = -Dcimg_use_magick
MAGICK_INCDIR = $(shell pkg-config --cflags GraphicsMagick++ || echo -I$(USR)/$(INCLUDE)/GraphicsMagick)
MAGICK_CFLAGS = $(MAGICK_DEFINE) $(MAGICK_INCDIR)
MAGICK_LIBS = $(shell pkg-config --libs GraphicsMagick++ || echo -lGraphicsMagick++)

Compiling for ImageMagick produces errors. Compile flags:

CXXFLAGS="-Dcimg_use_magick $(pkg-config --cflags Magick++)"
LDLIBS="$(pkg-config --libs Magick++)"

Errors:

+ make -j20 -C src 'CXXFLAGS=-pipe -frecord-gcc-switches -Wall -fdiagnostics-color=always -fdiagnostics-color=always -g -O2 -flto=auto  -D__POSIX_VERSION -Dcimg_use_magick -fopenmp -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -fopenmp -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -fopenmp -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -I/usr/include/ImageMagick-7' 'LDLIBS=-lMagick++-7.Q16HDRI -lMagickWand-7.Q16HDRI -lMagickCore-7.Q16HDRI'
make: Entering directory '/usr/src/RPM/BUILD/tiv-1.2/src'
g++ -pipe -frecord-gcc-switches -Wall -fdiagnostics-color=always -fdiagnostics-color=always -g -O2 -flto=auto  -D__POSIX_VERSION -Dcimg_use_magick -fopenmp -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -fopenmp -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -fopenmp -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16 -I/usr/include/ImageMagick-7 -std=c++20 -Wall -fexceptions   -c -o tiv.o tiv.cpp
In file included from tiv.cpp:47:
CImg.h: In member function 'cimg_library::CImg<T>& cimg_library::CImg<T>::load_magick(const char*)':
CImg.h:54835:20: error: 'PaletteMatteType' is not a member of 'Magick'; did you mean 'PaletteType'?
54835 |       case Magick::PaletteMatteType :
      |                    ^~~~~~~~~~~~~~~~
      |                    PaletteType
CImg.h:54836:20: error: 'TrueColorMatteType' is not a member of 'Magick'; did you mean 'TrueColorType'?
54836 |       case Magick::TrueColorMatteType :
      |                    ^~~~~~~~~~~~~~~~~~
      |                    TrueColorType
CImg.h:54840:17: error: 'PixelPacket' is not a member of 'Magick'; did you mean 'PixelMask'?
54840 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                 ^~~~~~~~~~~
      |                 PixelMask
CImg.h:54840:30: error: 'pixels' was not declared in this scope
54840 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                              ^~~~~~
CImg.h:54853:17: error: 'PixelPacket' is not a member of 'Magick'; did you mean 'PixelMask'?
54853 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                 ^~~~~~~~~~~
      |                 PixelMask
CImg.h:54853:30: error: 'pixels' was not declared in this scope
54853 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                              ^~~~~~
CImg.h:54861:20: error: 'GrayscaleMatteType' is not a member of 'Magick'; did you mean 'GrayscaleType'?
54861 |       case Magick::GrayscaleMatteType : {
      |                    ^~~~~~~~~~~~~~~~~~
      |                    GrayscaleType
CImg.h:54864:17: error: 'PixelPacket' is not a member of 'Magick'; did you mean 'PixelMask'?
54864 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                 ^~~~~~~~~~~
      |                 PixelMask
CImg.h:54864:30: error: 'pixels' was not declared in this scope
54864 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                              ^~~~~~
CImg.h:54874:17: error: 'PixelPacket' is not a member of 'Magick'; did you mean 'PixelMask'?
54874 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                 ^~~~~~~~~~~
      |                 PixelMask
CImg.h:54874:30: error: 'pixels' was not declared in this scope
54874 |         Magick::PixelPacket *pixels = image.getPixels(0,0,W,H);
      |                              ^~~~~~
CImg.h: In member function 'const cimg_library::CImg<T>& cimg_library::CImg<T>::save_magick(const char*, unsigned int) const':
CImg.h:59258:15: error: 'PixelPacket' is not a member of 'Magick'; did you mean 'PixelMask'?
59258 |       Magick::PixelPacket *pixels = image.getPixels(0,0,_width,_height);
      |               ^~~~~~~~~~~
      |               PixelMask
CImg.h:59258:28: error: 'pixels' was not declared in this scope
59258 |       Magick::PixelPacket *pixels = image.getPixels(0,0,_width,_height);
      |                            ^~~~~~
make: *** [<builtin>: tiv.o] Error 1

Note about their independence on http://www.graphicsmagick.org/

GraphicsMagick is originally derived from ImageMagick 5.5.2 as of November 2002 but has been completely independent of the ImageMagick project since then.