--- external_libraries/CMakeLists.txt.orig	2019-05-24 16:22:36.227027000 +0000
+++ external_libraries/CMakeLists.txt	2019-05-24 16:23:37.721453000 +0000
@@ -52,8 +52,10 @@
 	endif()
 
 
-	if(CMAKE_SYSTEM_NAME MATCHES "Linux")
+	if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
 		target_compile_options(boost_thread PRIVATE -fPIC)
+		target_compile_options(boost_system PRIVATE -fPIC)
+		target_compile_options(boost_filesystem PRIVATE -fPIC)
 		target_link_libraries(boost_thread rt)
 	endif()
 
