AMDG I ran the test with most of the compilers I have available. I'm getting a lot of compiler warnings from msvc-9.0express, msvc-8.0express, and gcc-3.4.4. gcc-4.2.3, gcc-4.3.0, and gcc-mingw-4.4.1 are fine. como fails with "c:\boost\gtl\boost\polygon\detail/iterator_points_to_compact.hpp", line 21: err or #135: namespace "std" has no member "ptrdiff_t" typedef std::ptrdiff_t difference_type; ^ "c:\boost\gtl\boost\polygon\detail/iterator_compact_to_points.hpp", line 22: err or #135: namespace "std" has no member "ptrdiff_t" typedef std::ptrdiff_t difference_type; ^ "c:\boost\gtl\boost\polygon\polygon_45_data.hpp", line 63: error #135: namespace "std" has no member "size_t" inline std::size_t size() const { return coords_.size(); } ^ "c:\boost\gtl\boost\polygon\polygon_data.hpp", line 61: error #135: namespace "std" has no member "size_t" inline std::size_t size() const { return coords_.size(); } ^ "c:\boost\gtl\boost\polygon\polygon_90_data.hpp", line 70: error #135: namespace "std" has no member "size_t" inline std::size_t size() const { return coords_.size(); } ^ Error limit reached. 5 errors detected in the compilation of "gtl_boost_unit_test.cpp". Compilation terminated. Did you not #include <cstddef>? sun-5.9 says "detail/property_merge.hpp", line 286: Warning: output hides boost::polygon::merge_scanline<int, int, boost::polygon::polygon_90_set_data<int>, std::set<int>>::output. "detail/property_merge.hpp", line 127: Where: While instantiating "boost::polygon::merge_scanline<int, int, boost::polygon::polygon_90_set_data<int>, std::set<int>>::processVertex(std::vector<std::pair<boost::polygon::property_merge_interval<int>, std::pair<std::set<int>, std::set<int>>>, std::allocator<std::pair<boost::polygon::property_merge_interval<int>, std::pair<std::set<int>, std::set<int>>>>>&)". "detail/property_merge.hpp", line 127: Where: Instantiated from non-template code. "detail/property_merge.hpp", line 558: Warning: output hides boost::polygon::merge_scanline<int, int, boost::polygon::polygon_90_set_data<int>, std::set<int>>::output. "isotropy.hpp", line 183: Error: The function "floor" must have a prototype. "gtl_boost_unit_test.cpp", line 723: Where: While instantiating "boost::polygon::scale<boost::polygon::interval_data<int>>(boost::polygon::interval_data<int>&, double)". "gtl_boost_unit_test.cpp", line 723: Where: Instantiated from non-template code. 1 Error(s) and 2 Warning(s) detected. 1) you should use std::floor. 2) The is no #include <cstdlib> in isotropy.h. In Christ, Steven Watanabe