--- builds/posix/make.defaults
+++ builds/posix/make.defaults
@@ -102,7 +102,7 @@
 #____________________________________________________________________________
 
 # Firebird needs no RTTI
-RTTI_FLAG:= -fno-rtti
+RTTI_FLAG:=
 
 # If this is defined then we use special rules useful for developers only
 IsDeveloper = @DEVEL_FLG@