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isomorphismes
Asked: 2017-08-25 11:37:11 +0800 CST

where to stick libraries I install myself?

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In building ffmpeg from source, I got the following error to ./configure --with-libcelt:

ERROR: libcelt not found

So I went to http://www.celt-codec.org/downloads/, cloned the repo, and ./autogen.sh; ./configure; make; make install; make checked it.

Back to ffmpeg source directory, ./configure --with-libcelt again gave the same error.

I tried soft-linking /opt/celt/libcelt/celt.h into /usr/local/lib, but I am now officially stabbing in the dark.

I thought /usr/local/lib is the canonical place a ./configure package would look for a library, and that the main named .header file would be enough to show the configurator where things are. What's the right answer?

compiling

1 Answers

  1. Header files, among other things, tell the compiler what functions, values, etc. exist in a library. Just because you point to the header file it doesn't mean that the linker will know where to look for the corresponding library. /usr/lib and /usr/local/lib are normally used when installing third party programs. Now, /opt is usually used for programs untar into one folder.

    From what I can see you have celt in the /opt/celt folder. Look for there for a file that looks something like libcelt.so. That is were you need to point the linker to. Assuming the file is somewhere in there, then you can point the linker to look into that folder by updating the library path variable as such:

    export LD_LIBRARY_PATH=/opt/celt:$LD_LIBRARY_PATH

    Then run your configure and make scripts again. You may need to start a clean installation.

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