why are .pc files not listed in one place

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I am on Debian buster. I was reading the manpage of pkg-config and found that .pc files are and can be listed in many places . From the manpage -




pkg-config retrieves information about packages from special
metadata files. These files are named after the package, and has a .pc
extension. On most systems, pkg-config looks in /usr/lib/pkgconfig,
/usr/share/pkgconfig, /usr/local/lib/pkgconfig and
/usr/local/share/pkgconfig for these files. It will additionally look
in the colon-separated (on Windows, semicolon-separated) list of
directories specified by the PKG_CONFIG_PATH environment variable.




  • From pkg-config manpage

sure enough I saw that there are packages in /usr/lib/pkgconfig/, /usr/lib/x86_64-linux-gnu/pkgconfig/ and /usr/share/pkgconfig/ , while I can understand the /usr/local/.. part for locally compiled/built apps. I do not understand why there is a distinction between /usr/lib/pkgconfig/ and /usr/share/pkgconfig . Is it something to do with some things need to be in userspace https://en.wikipedia.org/wiki/User_space or something else entirely ?




debian libraries pkg-config




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    up vote
    0
    down vote

    favorite












    I am on Debian buster. I was reading the manpage of pkg-config and found that .pc files are and can be listed in many places . From the manpage -




    pkg-config retrieves information about packages from special
    metadata files. These files are named after the package, and has a .pc
    extension. On most systems, pkg-config looks in /usr/lib/pkgconfig,
    /usr/share/pkgconfig, /usr/local/lib/pkgconfig and
    /usr/local/share/pkgconfig for these files. It will additionally look
    in the colon-separated (on Windows, semicolon-separated) list of
    directories specified by the PKG_CONFIG_PATH environment variable.




    • From pkg-config manpage

    sure enough I saw that there are packages in /usr/lib/pkgconfig/, /usr/lib/x86_64-linux-gnu/pkgconfig/ and /usr/share/pkgconfig/ , while I can understand the /usr/local/.. part for locally compiled/built apps. I do not understand why there is a distinction between /usr/lib/pkgconfig/ and /usr/share/pkgconfig . Is it something to do with some things need to be in userspace https://en.wikipedia.org/wiki/User_space or something else entirely ?




    debian libraries pkg-config




    share|improve this question






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I am on Debian buster. I was reading the manpage of pkg-config and found that .pc files are and can be listed in many places . From the manpage -




      pkg-config retrieves information about packages from special
      metadata files. These files are named after the package, and has a .pc
      extension. On most systems, pkg-config looks in /usr/lib/pkgconfig,
      /usr/share/pkgconfig, /usr/local/lib/pkgconfig and
      /usr/local/share/pkgconfig for these files. It will additionally look
      in the colon-separated (on Windows, semicolon-separated) list of
      directories specified by the PKG_CONFIG_PATH environment variable.




      • From pkg-config manpage

      sure enough I saw that there are packages in /usr/lib/pkgconfig/, /usr/lib/x86_64-linux-gnu/pkgconfig/ and /usr/share/pkgconfig/ , while I can understand the /usr/local/.. part for locally compiled/built apps. I do not understand why there is a distinction between /usr/lib/pkgconfig/ and /usr/share/pkgconfig . Is it something to do with some things need to be in userspace https://en.wikipedia.org/wiki/User_space or something else entirely ?




      debian libraries pkg-config




      share|improve this question












      I am on Debian buster. I was reading the manpage of pkg-config and found that .pc files are and can be listed in many places . From the manpage -




      pkg-config retrieves information about packages from special
      metadata files. These files are named after the package, and has a .pc
      extension. On most systems, pkg-config looks in /usr/lib/pkgconfig,
      /usr/share/pkgconfig, /usr/local/lib/pkgconfig and
      /usr/local/share/pkgconfig for these files. It will additionally look
      in the colon-separated (on Windows, semicolon-separated) list of
      directories specified by the PKG_CONFIG_PATH environment variable.




      • From pkg-config manpage

      sure enough I saw that there are packages in /usr/lib/pkgconfig/, /usr/lib/x86_64-linux-gnu/pkgconfig/ and /usr/share/pkgconfig/ , while I can understand the /usr/local/.. part for locally compiled/built apps. I do not understand why there is a distinction between /usr/lib/pkgconfig/ and /usr/share/pkgconfig . Is it something to do with some things need to be in userspace https://en.wikipedia.org/wiki/User_space or something else entirely ?





      debian libraries pkg-config





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      asked Feb 8 at 17:28









      shirish

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          The distinction is related to architecture independence. .pc files which might be architecture-specific go in /usr/lib (on Debian, /usr/lib/pkgconfig for pre-multiarch packages, /usr/lib/<triplet>/pkgconfig for multiarch packages), .pc files which are sure to be architecture-independent can go in /usr/share (only /usr/share/pkgconfig, no need to distinguish triplets here).






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            1 Answer
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            active

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            oldest

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            active

            oldest

            votes








            up vote
            2
            down vote



            accepted










            The distinction is related to architecture independence. .pc files which might be architecture-specific go in /usr/lib (on Debian, /usr/lib/pkgconfig for pre-multiarch packages, /usr/lib/<triplet>/pkgconfig for multiarch packages), .pc files which are sure to be architecture-independent can go in /usr/share (only /usr/share/pkgconfig, no need to distinguish triplets here).






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              up vote
              2
              down vote



              accepted










              The distinction is related to architecture independence. .pc files which might be architecture-specific go in /usr/lib (on Debian, /usr/lib/pkgconfig for pre-multiarch packages, /usr/lib/<triplet>/pkgconfig for multiarch packages), .pc files which are sure to be architecture-independent can go in /usr/share (only /usr/share/pkgconfig, no need to distinguish triplets here).






              share|improve this answer






















                up vote
                2
                down vote



                accepted







                up vote
                2
                down vote



                accepted






                The distinction is related to architecture independence. .pc files which might be architecture-specific go in /usr/lib (on Debian, /usr/lib/pkgconfig for pre-multiarch packages, /usr/lib/<triplet>/pkgconfig for multiarch packages), .pc files which are sure to be architecture-independent can go in /usr/share (only /usr/share/pkgconfig, no need to distinguish triplets here).






                share|improve this answer












                The distinction is related to architecture independence. .pc files which might be architecture-specific go in /usr/lib (on Debian, /usr/lib/pkgconfig for pre-multiarch packages, /usr/lib/<triplet>/pkgconfig for multiarch packages), .pc files which are sure to be architecture-independent can go in /usr/share (only /usr/share/pkgconfig, no need to distinguish triplets here).







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                answered Feb 8 at 17:36









                Stephen Kitt

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