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From: John-Paul Stewart 
Newsgroups: 24hoursupport.helpdesk,alt.os.linux.ubuntu,comp.os.linux.misc
Subject: Re: errors trying to install mplayerplug-in from source
Date: Mon, 26 Feb 2007 21:40:48 -0500
Organization: Binary Foundry
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alt.os.linux.ubuntu:11121 comp.os.linux.misc:663627

noalternative wrote:
> Ok, I am trying to follow the instructions in the mplayerplugin for Opera
> howto. http://ubuntuforums.org/showthread.php?t=185547&page=2
> 
> Anyway, I didn't seem to get any errors during the actual compiling phase.
>  but when I entered "make" I seemed to run into problems. Here is the
>  output.
[snip]
> /usr/local/gecko-sdk1.6/plugin/include/npapi.h:119:24: error: X11/Xlib.h:
> No suc h file or directory

This and many of the other errors suggest that you're missing the 
various X -dev packages.  Try installing xlibs-dev.  (Or you may need to 
individually install libx11-dev, libxext-dev, and assorted other 
libx*-dev packages instead.  I'm not sure if Ubuntu will provide the 
xlibs-dev package.)
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