--- a/crawl-ref/source/rltiles/Makefile.orig	2020-03-22 05:52:08.000000000 +0100
+++ b/crawl-ref/source/rltiles/Makefile	2020-04-21 22:23:00.718813687 +0200
@@ -11,7 +11,7 @@
 # is not supported.  If host=target, contribs are enough.
 
 PKGCONFIG = pkg-config
-CFLAGS := -O2 $(STDFLAG) -g -Wall -Wextra -Wno-parentheses -Wno-unused-parameter
+CFLAGS := $(CFOPTIMIZE_L) $(STDFLAG) -Wno-parentheses -Wno-unused-parameter
 
 ifdef ANDROID
   CXXFLAGS :=