【MLT編譯問題】"PkgConfig:xml" includes non-existent path

使用 cmake .. 編譯 mlt 框架時，遇到了以下問題：

CMake Error in src/modules/xml/CMakeLists.txt:
  Imported target "PkgConfig::xml" includes non-existent path

    "/usr/include/libxml2"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.

經過查看 mlt 中關於 libxml2 的配置能夠發如今 CMakeLists.txt 中經過 pkgconfig 添加的依賴。
具體的緣由應該是和 cmake 和 pkgconfig 的語法相關，經過查詢資料，獲得以下解決方案，親測可行：

• 經過 brew info libxml2 查看 libxml2 的安裝路徑

  • 路徑爲：/usr/local/Cellar/libxml2/2.9.9_2

• 打開該路徑下的 lib/pkgconfig/libxml-2.0.pc 文件

  把
  includedir=${prefix}/include
  修改成
  includedir=${pc_sysrootdir}${prefix}/include