Compiling fails: file missing but it's there


I try to compile xf4vnc on Lenny AMD64 following this page:
Only compiling the xserver fails. It complains about missing pixmap.h file. The file is installed via aptitude ("/usr/include/pixman-1/pixman.h") and when trying "make install" it seems to look in the right directory because "-I/usr/include/pixman-1" is visible.
Can someone help me please?

Best regards,

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