diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae87c6e..d7f8f39 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -362,7 +362,7 @@ add_subdirectory("third_party/fpattern")
 target_link_libraries(${EXECUTABLE_NAME} ${FPATTERN_LIBRARY})
 target_include_directories(${EXECUTABLE_NAME} PRIVATE ${FPATTERN_INCLUDE_DIR})
 
-if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+if((NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux") AND (NOT ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD") AND (NOT ${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD"))
     add_subdirectory("third_party/zlib")
     add_subdirectory("third_party/sdl2")
 else()