Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -1989,11 +1989,11 @@
 AS_IF([test x"$GOBJC" = x"yes"], [
 	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wpointer-arith"
 
 	AC_ARG_ENABLE(werror,
 		AS_HELP_STRING([--disable-werror], [do not build with -Werror]))
-	AS_IF([test x"$enable_werror" != x"no"], [
+	AS_IF([test x"$enable_werror" = x"yes"], [
 		OBJCFLAGS="$OBJCFLAGS -Werror"
 	])
 
 	AC_MSG_CHECKING(whether we need -Wno-strict-aliasing due to GCC bugs)
 	AC_COMPILE_IFELSE([