ltse on "[Plugin: EWWW Image Optimizer] jpeg tran installed but not recognized?"

Hi,

the debug info indicates that jpegtran is installed but it still says "jpegtran is missing"

Here is the debug:

jpegtran version: Independent JPEG Group's JPEGTRAN, version 6b 27-Mar-1998
optipng version:
gifsicle version:
pngout version:
GD: OK
Imagemagick convert installed: NO
safe mode: Off
Operating System: Linux
exec(): enabled
getimagesize(): OK
mime_content_type(): missing

http://wordpress.org/extend/plugins/ewww-image-optimizer/