libgif depends on X11

[Daniel Colascione]

$ ldd /bin/cyggif-4.dll
        ntdll.dll => /Windows/SysWOW64/ntdll.dll (0x7de70000)
        kernel32.dll => /Windows/syswow64/kernel32.dll (0x7dd60000)
        KERNELBASE.dll => /Windows/syswow64/KERNELBASE.dll (0x7d850000)
        cyggcc_s-1.dll => /usr/bin/cyggcc_s-1.dll (0xc3c70000)
        cygwin1.dll => /usr/bin/cygwin1.dll (0x61000000)
        cygX11-6.dll => /usr/bin/cygX11-6.dll (0xc4e90000)
        cygxcb-1.dll => /usr/bin/cygxcb-1.dll (0xc02f0000)
        cygXau-6.dll => /usr/bin/cygXau-6.dll (0xc4e70000)
        cygXdmcp-6.dll => /usr/bin/cygXdmcp-6.dll (0xc4dd0000)
        ??? => ??? (0x580000)

Why would libgif depend on X11? The symbols imported are XGetImage,
XGetWindowAttributes, and XQueryColors.

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