CoreGraphics call CGBitmapContextGetBitmapInfo isn't available before MacOS X 10.4. This makes the build fails (at least when -Werror-implicit-function-declaration is used). However the call doesn't seems to be required, well at least it doesn't seems to break libgdiplus when executed on PPC prior to 10.4.
*** This bug has been marked as a duplicate of 6697 ***
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