Fixed build issue on MacOS

CMakeLists.txt

@@ -59,7 +59,7 @@ if(APPLE)
 
   include_directories(/usr/local/opt/gettext/include)
   set(CMAKE_MACOSX_RPATH 1)
-  set(ENV{PKG_CONFIG_PATH} "/opt/homebrew/opt/fontconfig/lib/pkgconfig:/usr/local/opt/fontconfig/lib/pkgconfig:$ENV{PKG_CONFIG_PATH}:/usr/local/lib/pkgconfig:/opt/X11/lib/pkgconfig:/usr/local/opt/libffi/lib/pkgconfig:/usr/local/opt/libsigc++@2/lib/pkgconfig:/usr/local/opt/zlib/lib/pkgconfig:/usr/local/opt/libxml2/lib/pkgconfig")
+  set(ENV{PKG_CONFIG_PATH} "/opt/homebrew/opt/cairo/lib/pkgconfig:/opt/homebrew/opt/fontconfig/lib/pkgconfig:/usr/local/opt/fontconfig/lib/pkgconfig:$ENV{PKG_CONFIG_PATH}:/usr/local/lib/pkgconfig:/opt/X11/lib/pkgconfig:/usr/local/opt/libffi/lib/pkgconfig:/usr/local/opt/libsigc++@2/lib/pkgconfig:/usr/local/opt/zlib/lib/pkgconfig:/usr/local/opt/libxml2/lib/pkgconfig")
 endif()
 if(${CMAKE_SYSTEM_NAME} MATCHES FreeBSD)
   link_directories(/usr/local/lib)