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Some coaching on apt-get and downgrading Package gtk+-2.0

To get to the point quicker, skip over the "Background:" down to "My 
question / problem:"


I'm not really a C or C++ programmer, but I've been working on a program 
(well, an addition to an existing program--a lexer for Scintilla for 
the Foswiki/ TWiki markup language) and "limping along" well enough but 
very slowly.

Yesterday, my build started failing with messages like this:

"Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-2.0' found
make: Nothing to be done for `all'."

It took me a while to realize what must have happened, and then I think 
I confirmed it.  Earlier that day, I had installed a new version of 
Adobe/Shockwave flash by using: 

"aptitude install flashplugin-nonfree"

(Aside: It took me a while to get that to work, I finally had to find 
the new libflashplayer.so (in a /root directory) and copy it 
to /usr/lib/adobe-flashplugin/libflashplayer.so, and then restart 
iceweasel.  (I'm not sure why it got installed to /root--probably some 
mistake I made--maybe having Iceweasel running while I tried the 
aptitude install, or maybe it was at some other point I made a 

Anyway, I then remembered that during the aptitude install of 
flashplugin-nonfree, it deleted and replaced a lot of packages, among 

"Preparing to replace libgtk2.0-0 2.12.12-1~lenny1 
(using .../libgtk2.0-0_2.18.6-1~bpo50+1_i386.deb) ..."

I think that is the root of my problem, and, iirc, the version of 
Scintilla that I'm currently developing in cannot use gtk2.0-0_2.18.  
There is work going on to change that, but I'd like to finish my 
development work on the older version of Scintilla before contending 
with an upgrade.

My question / problem:

So, I think what I have to do 
is "downgrade" /libgtk2.0-0_2.18.6-1~bpo50+1_i386.deb back to 
libgtk2.0-0 2.12.12-1~lenny.

I'll be reading man pages and googling, but I'd like to do that with a 
minimum of learning (i.e., with a minimum of mistakes), so I'm seeking 

I guess there is a slight chance that all I have to do is, as one of the 
make messages says: 

"Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable"

I.e., find the PKG_CONFIG_PATH and point it to the directory containing 
the new /libgtk2.0-0_2.18.6-1~bpo50+1_i386.deb instead of the old 
libgtk2.0-0 2.12.12-1~lenny (but, I would have thought they'd both be 
on the same path).  Let me look into that a little bit before sending 
this email...

Ok, I'm back.  I hoped/thought that aptitude (or apt-get) had something 
a "what provides" command which would tell me what package I need to 
install for `gtk+-2.0.pc', but maybe I'm remembering that from my 
Mandriva days.

I tried "aptitude install gtk+-2.0.pc" but that tells me:

"Couldn't find any package whose name or description 
matched "gtk+-2.0.pc""

So, I'll send this and keep digging.

Randy Kramer

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