<if cond="TOOLKIT=='MAC'">src/mac/glcanvas.cpp</if>
<if cond="TOOLKIT=='GTK'">src/gtk/glcanvas.cpp</if>
<if cond="TOOLKIT=='MSW'">src/msw/glcanvas.cpp</if>
<if cond="TOOLKIT=='MAC'">src/mac/glcanvas.cpp</if>
<if cond="TOOLKIT=='GTK'">src/gtk/glcanvas.cpp</if>
<if cond="TOOLKIT=='MSW'">src/msw/glcanvas.cpp</if>