[Inkscape-devel] compile errors on rev 10621, Windows XP

attempting to compile rev 10621, I get

Make error line 289: problem compiling: src/desktop-style.cpp: In function 'gdouble stroke_average_width(const GSList*)': src/desktop-style.cpp:429:59: error: 'isnan' was not declared in this scope src/desktop-style.cpp: In function 'int objects_query_strokewidth(GSList*, SPStyle*)': src/desktop-style.cpp:731:22: error: 'isnan' was not declared in this scope src/desktop-style.cpp: In function 'int objects_query_fontnumbers(GSList*, SPStyle*)': src/desktop-style.cpp:969:25: error: 'isnan' was not declared in this scope src/desktop-style.cpp: In function 'int objects_query_blur(GSList*, SPStyle*)': src/desktop-style.cpp:1459:41: error: 'isnan' was not declared in this scope

Alvin