+# Check whether --with-private_namespace was given.
+if test "${with_private_namespace+set}" = set; then :
+ withval=$with_private_namespace; JEMALLOC_PRIVATE_NAMESPACE="$with_private_namespace"
+else
+ JEMALLOC_PRIVATE_NAMESPACE=""
+
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define JEMALLOC_PRIVATE_NAMESPACE "$JEMALLOC_PRIVATE_NAMESPACE"
+_ACEOF
+
+if test "x$JEMALLOC_PRIVATE_NAMESPACE" != "x" ; then