--- CMakeLists.txt.orig	2019-10-26 04:47:57 UTC
+++ CMakeLists.txt
@@ -112,7 +112,7 @@ IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Darwin")
 ENDIF()
 
 SET(LINUX FALSE)
-IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux")
+IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux|FreeBSD")
     SET(LINUX TRUE)
 ENDIF()