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Though --enable-pdf=yes by default, when --enable-pdf=no, the cairo build
fails due to unavailability of cairo-pdf.h and related cairo pdf's apis.
The current changes fixes this issue by conditionally checking if PDF
surface is enabled or not.
Signed-off-by: Ravi Nanjundappa <nravi.n@samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
Tested-by: Bryce Harrington <bryce@osg.samsung.com>