Uwe:

I'm getting this error even with files that don't have included PDFs.
Also, I've generated the included files (where I use them) with Acrobat
so that they are PDF version 1.4.

I'm using this version of pdflatex (running on Fedora Core 3):

$ pdflatex -v
pdfTeX (Web2C 7.4.5) 3.14159-1.10b
kpathsea version 3.4.5

So are you saying that I should install a new version of pdflatex? Any
other ideas what could be causing this? 

Thanks in advance,
--jane

On Sat, 2005-03-05 at 02:58 +0100, Uwe StÃhr wrote:
> Jane McKean wrote:
> 
> > When I generate my PDFs using View > PDF(pdflatex), I get the following
> > warning during the generation:
> > 
> > Error: PDF version 1.5 -- xpdf supports version 1.4 (continuing anyway)
> > 
> > Is there some mechanism for setting the PDF version from within LyX, so
> > that it would generate PDF version 1.4?
> 
> No it isn't. The pdf-version depends on the pdflatex-version, because 
> pdflatex uses internally xpdf.
> The error occurs when you use external pdf's (in pdf 1.5 format) in your 
> document. Possibly you inserted a pdf image.
> To get rid of this error, reduce the pdf version using a pdf editor 
> (e.g. Acrobat) or update pdflatex.
> xpdf version 3 supports pdf 1.5. And this version is used in pdflatex 
> since version 1.2x. The new teTeX 3 comes with pdflatex 1.21a.
> 
> regards Uwe

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