diff --git a/config/.Sanitize b/config/.Sanitize
index 9b42c547369..74d0e1b0c9e 100644
--- a/config/.Sanitize
+++ b/config/.Sanitize
@@ -66,6 +66,7 @@ mh-windows
 mh-x86pic
 mpw
 mpw-mh-mpw
+mt-linux
 mt-m68kpic
 mt-netware
 mt-papic
diff --git a/config/mt-linux b/config/mt-linux
new file mode 100644
index 00000000000..bbd9792c593
--- /dev/null
+++ b/config/mt-linux
@@ -0,0 +1,2 @@
+# When using glibc 2 on Linux we must always use vtable thunks.
+  CXXFLAGS=-O2 -g -fvtable-thunks