https://bugs.gentoo.org/962946
https://github.com/facebook/folly/issues/2489
--- a/CMake/folly-config.cmake.in
+++ b/CMake/folly-config.cmake.in
@@ -38,7 +38,6 @@ find_dependency(Boost 1.51.0 MODULE
     filesystem
     program_options
     regex
-    system
     thread
   REQUIRED
 )
--- a/CMake/folly-deps.cmake
+++ b/CMake/folly-deps.cmake
@@ -41,7 +41,6 @@ find_package(Boost 1.51.0 MODULE
     filesystem
     program_options
     regex
-    system
     thread
   REQUIRED
 )