Compilation Error with Clipper Backend: boost::geometry::model::polygon not found in boost_alg.hpp

[sherlcrow]

I encountered a compilation error when trying to use libnest2d with the Clipper backend after installing it system-wide using CMake.

1. Environment:

OS: TencentOS (Based on RHEL/CentOS)
Compiler: GCC (via devtoolset-7)
Boost: Installed via yum install boost-devel (Version: 1.53.0-25.el7)
Polyclipping: Installed via yum install polyclipping-devel (Version: 6.4.2-14.el7)

2. I have finished configuer:
   mkdir build && cd build
   cmake .. -DLIBNEST2D_HEADER_ONLY=OFF -DCMAKE_INSTALL_PREFIX=/usr/local -DRP_ENABLE_DOWNLOADING=ON
   cmake --build . --target install

3. Create a simple test file (main.cpp) that includes libnest2d with the Clipper backend defined:
   #define LIBNEST2D_GEOMETRIES_clipper
   #define LIBNEST2D_OPTIMIZER_nlopt
   #include <libnest2d/libnest2d.hpp>

int main() {
// Example usage code here
return 0;
}

4. Attempt to compile the test file:
   In file included from /usr/local/include/libnest2d/backends/clipper/geometries.hpp:352:0,
   from /usr/local/include/libnest2d/libnest2d.hpp:7,
   from main.cpp:11:
   /usr/local/include/libnest2d/utils/boost_alg.hpp: In function ‘std::string libnest2d::shapelike::serialize(const S&, double) [with libnest2d::Formats = (libnest2d::Formats)1; S = ClipperLib::Polygon; std::string = std::basic_string]’:
   /usr/local/include/libnest2d/utils/boost_alg.hpp:441:29: error: ‘polygon’ in namespace ‘boost::geometry::model’ does not name a template type
   using Polygonf = model::polygon;
   ^~~~~~~
   /usr/local/include/libnest2d/utils/boost_alg.hpp:443:5: error: ‘Polygonf’ has not been declared
   Polygonf::ring_type ring;
   ^~~~~~~~
   /usr/local/include/libnest2d/utils/boost_alg.hpp:444:5: error: ‘Polygonf’ has not been declared
   Polygonf::inner_container_type holes;
   ^~~~~~~~
   /usr/local/include/libnest2d/utils/boost_alg.hpp:445:5: error: ‘ring’ was not declared in this scope
   ring.reserve(shapelike::contourVertexCount(sh));
   ^~~~
   [... many more boost::geometry related errors follow ...]

5. Question:
   Is there a specific minimum/maximum version of Boost required for the Clipper backend to function correctly with the installed method? Or is this a known compatibility issue with the interaction between Boost 1.60.0, Polyclipping 6.4.2, and the current libnest2d code's use of boost::geometry algorithms on Clipper types?