GraphicsMagick++-config --version

  c++ `GraphicsMagick++-config --cxxflags --cppflags --ldflags --libs` program.cpp

--cppflags

Print the preprocessor flags that are needed to find the GraphicsMagick C and C++ include files and defines to ensures that the GraphicsMagick data structures match between your program and the installed libraries.

--cxxflags

Print the compiler flags that were used to compile libMagick++.

--exec-prefix

Print the directory under which target specific binaries and executables are installed.

--ldflags

Print the linker flags that are needed to link with the libMagick++ library.

--libs

Print the linker flags that are needed to link a program with libMagick++.

--prefix

Print the directory under which the package is installed.

--version

Print the version of the GraphicsMagick distribution to standard output.