try 
system ("./lib/texmf/miktex/bin/pdflatex $outputfile.tex>$outputfile.2
+.log")

[download]
(note: no spaces around ">").

For asynchronous execution of an external command, check out exec() fork() or Win32::Process.

Update: bart corrected my error about exec().


holli, /regexed monk/

In reply to Re: pdflatex and system by holli
in thread pdflatex and system by josera

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