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I have replaced the exec function with:

 echo `/usr/local/bin/convpng -i /home/trek/server/{$makefile} >> /home/trek/www/srv/convpng.log &`;

The webserver no longer hangs, but the error log says the following.

/usr/local/bin/convpng: 1: /usr/local/bin/convpng: Syntax error: word unexpected (expecting ")")

Also, nothing gets piped to the log file.
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