René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"pkg-config file is broken when CMAKE_INSTALL_{INCLUDE,LIB}DIR is absolute","articleBody":"**Describe the issue**\r\n\r\nAs per title: `tinyobjloader.pc.in` has\r\n```\r\nprefix=@CMAKE_INSTALL_PREFIX@\r\nexec_prefix=${prefix}\r\nlibdir=${prefix}/@TINYOBJLOADER_LIBRARY_DIR@\r\nincludedir=${prefix}/@TINYOBJLOADER_INCLUDE_DIR@\r\n```\r\nwhere `TINYOBJLOADER_{LIBRARY,INCLUDE}_DIR` is set in `CMakeLists.txt` to the value of `CMAKE_INSTALL_{LIB,INCLUDE}DIR`, so it is unable to handle absolute paths being passed in the latter (unusual but valid per [documentation of GNUInstallDirs](https://cmake.org/cmake/help/latest/module/GNUInstallDirs.html#result-variables)). This leads to broken .pc files on NixOS in particular.\r\n\r\nSee “[Concatenating paths when building pkg-config files](https://github.com/jtojnar/cmake-snips#concatenating-paths-when-building-pkg-config-files)” for a thorough discussion of the problem and a suggested fix, or [KDE’s extra-cmake-modules](https://invent.kde.org/frameworks/extra-cmake-modules/-/blob/master/modules/ECMGeneratePkgConfigFile.cmake#L166) for a simpler approach.\r\n\r\n**Environment**\r\n - TinyObjLoader version: 1.0.7 (inspection confirms issue exists on master as well)\r\n - OS: `Linux localhost 5.15.36 #1-NixOS SMP Wed Apr 27 12:39:02 UTC 2022 x86_64 GNU/Linux`\r\n - Compiler: CMake 3.22.3, GCC 11.2.0, GNU binutils 2.38","author":{"url":"https://github.com/alexshpilkin","@type":"Person","name":"alexshpilkin"},"datePublished":"2022-05-18T20:57:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/336/tinyobjloader/issues/336"}