diff --git a/config/mt-ospace b/config/mt-ospace
new file mode 100644
index 0000000000000000000000000000000000000000..7f091041d8a7f93b98c4fa3b3d0c04a79708fed4
--- /dev/null
+++ b/config/mt-ospace
@@ -0,0 +1,3 @@
+# Build libraries optimizing for space, not speed.
+ CFLAGS_FOR_TARGET = -g -Os
+ CXXFLAGS_FOR_TARGET = -g -Os