CODEWITHSUNDEEP
clinuxgstreamercentos7pkg-config
jackson80
jackson80

Reputation: 53

Where do the pkg-config targets get defined?

When I perform the command 

pkg-config --variable pc_path pkg-config

The output is

/usr/lib64/pkgconfig:/usr/share/pkgconfig

However, there are two other pkgconfig directories on my system: /usr/lib/pkgconfig and /usr/local/lib/pkgconfig

If I try

echo $PKG_CONFIG_PATH

the result is

Undefined variable

I also tried to 

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

but the response was

export: Command not found.

Now, I have built Gstreamer on multiple occasions and it will put the metadata files (gstreamer-1.0.pc) into the other pkgconfig folder (usr/local/lib/pkgconfig). (I have been able to overcome this issue by modifying the configure file, changing lib to lib64 at the libdir definition.) But I would rather understand my system rather than try work-arounds.

So two questions: where does the pkg-config program get its target directories?

And why and how do the metadata files get put into a directory that is not apparently indicated by the pkg-config program?

Upvotes: 1

Views: 1576

Answers (2)

Salil
Salil

Reputation: 9722

When you install a foo package, foo package has an appropriate foo.pc that gets installed in the default pkgconfig directories. If a package puts its *.pc file in a custom location, as you already know, you should set your PKG_CONFIG_PATH accordingly. So, the pkg-config will not only look in the default directories, but also in the custom path you specified in PKG_CONFIG_PATH. This guide explains it well:

pkg-config guide

Upvotes: 0

Mausam Sinha
Mausam Sinha

Reputation: 153

Since the command is not working because that variable was not present first check that variable is there or not for to do this execute command env root@localhost:/etc/apt# env if the path is not declare in env then do something like

root@localhost:/etc/apt# PKG_CONFIG_PATH=/usr/local/lib/pkgconfig root@localhost:/etc/apt# export PKG_CONFIG_PATH root@localhost:/etc/apt# echo $PKG_CONFIG_PATH /usr/local/lib/pkgconfig root@localhost:/etc/apt# env

Hope this will work for you for any further help please post the queries with error

Upvotes: 1

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