gd enabled but still reports PHP Fatal error: Call to undefined function imagecreatefromjpeg()

Has anyone met this problem ?

I've checked the output of phpinfo(),and see gd is enabled.

UPDATE

I built PHP with --with-gd, but only GIF Support and PNG Support are in the output of phpinfo(), how do I enable JPEG S开发者_运维技巧upport?

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Sounds like it wasn't built against libjpeg. See if "JPEG Support" in the gd section is "enabled".

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I can only guess, but:

• What version of php are you using ? (did you compile it yourself?)
• Under gd, do you see anything related to jpg ?
• What is your Configure Command? Does it say anything about jpg ?