--- libgrive/CMakeLists.txt.orig	2018-07-22 23:40:23 UTC
+++ libgrive/CMakeLists.txt
@@ -145,7 +145,7 @@ target_link_libraries( btest
 )
 
 if ( ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" )
-  set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-c++11-narrowing" )
+  set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_GLIBCXX_USE_CXX11_ABI=0" )
 endif ( ${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD" )
 
 if ( WIN32 )