[vox-tech] how to find the self-installed libs?

[Brian Lavender]

You may have already solved the problem, but here are some extra notes
to confuse^H^H^H^H^H help in the matter. P-)

I believe that sometimes you can set the environment variable (below), if for
some reason it doesn't have a configure option to search in /usr/local 
like the --include option Alex mentioned below.

export CFLAGS="-I/usr/local/include"

export LDFLAGS="-L/usr/local/lib"

This will help the configure script find your library. These
flags will be passed and used in the compile. 

When you run your program, you may have to set the LD_LIBRARY_PATH
variable.

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

Just a word of caution. If you you installed libx264 under the Debian
package management system, and then you grabbed a more recent version
elsewhere, you will want to check that your executable is not grabbing
the one installed through package management. You can check this using
the command 

ldd myexecutable

Here is a good tutorial. It's mostly for creating your own libraries,
but if you are the hacker type ( I assume that you are ), it will
provide useful insight.

http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html


brian



On Mon, May 31, 2010 at 11:58:56AM -0700, Alex Mandel wrote:
> On 05/31/2010 09:58 AM, Hai Yi wrote:
> > Hello All:
> > 
> > i've downloaded and installed libx264 from web since the one with
> > ubuntu (9.10) is lower in version. I can see that lib has been
> > installed on /usr/local/lib:
> > 
> > hai at zodiac:~/downloads/x264$ ls -ltr /usr/local/lib/libx264*
> > -rw-r--r-- 1 root root 993618 2010-05-31 12:50 /usr/local/lib/libx264.a
> > 
> > However it seems that it is NOT picked up by ffmpeg configuration:
> > 
> > hai at zodiac:~/ffmpeg$ ./configure --mandir=/usr/local/ffmpeg/share/man
> > --enable-gpl --enable-nonfree --enable-avfilter --enable-x11grab
> > --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm
> > --enable-libtheora --enable-libx264 --enable-libxvid --enable-zlib
> > ERROR: libx264 not found
> > 
> > 
> > nor shown when using
> > 
> > dpkg --get-selections | grep libx264
> > 
> > 
> > How can I do to make this lib awared to the system?
> > 
> > Thanks,
> > Hai
> 
> Some options:
> 1. When compiling yourself on a Debian based system use checkinstall
> where possible. This creates a local deb file and installs via the
> package manager.
> 
> 2.In you particular case /usr/local/lib just isn't in the normal path.
> You can either add it to the path via a command line statement or using
> the ldconfig system, OR you can specifiy directories to be included in
> the ffmpeg build process. It's usually something like
> --include=/usr/local/lib/ but check the docs of configure and the ffmpeg
> package.
> 
> Alex
> _______________________________________________
> vox-tech mailing list
> vox-tech at lists.lugod.org
> http://lists.lugod.org/mailman/listinfo/vox-tech

-- 
Brian Lavender
http://www.brie.com/brian/

"There are two ways of constructing a software design. One way is to
make it so simple that there are obviously no deficiencies. And the other
way is to make it so complicated that there are no obvious deficiencies."

Professor C. A. R. Hoare
The 1980 Turing award lecture