Support FreeBSD and DragonFly properly

Author: AMDmi3

CMakeLists.txt

@@ -142,7 +142,7 @@ if(NOT DEFINED BIN_INSTALL_DIR)
     set(BIN_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/bin)
 endif()
 
-if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+if(${CMAKE_SYSTEM_NAME} MATCHES "Linux|FreeBSD|DragonFly")
   # uninstall target
   configure_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cmake_uninstall.cmake.in"