diff --git a/bin/makefile-darwin.aarch64-x b/bin/makefile-darwin.aarch64-x
index 867eb5d..f603009 100644
--- a/bin/makefile-darwin.aarch64-x
+++ b/bin/makefile-darwin.aarch64-x
@@ -16,8 +16,8 @@ XFILES = $(OBJECTDIR)xmkicon.o \
 XFLAGS = -I/opt/X11/include -DXWINDOW
 
 # OPTFLAGS is normally -O2.
-OPTFLAGS =  -O2
-DEBUGFLAGS = # -DDEBUG -DOPTRACE
+OPTFLAGS = -g -O2
+DEBUGFLAGS = -DARRAYCHECK # -DDEBUG -DOPTRACE
 DFLAGS = $(DEBUGFLAGS) $(XFLAGS) -DRELEASE=351
 
 LDFLAGS = -L/opt/X11/lib -lX11 -lm
diff --git a/bin/makefile-darwin.x86_64-x b/bin/makefile-darwin.x86_64-x
index 54d61d4..ae0609d 100644
--- a/bin/makefile-darwin.x86_64-x
+++ b/bin/makefile-darwin.x86_64-x
@@ -17,7 +17,7 @@ XFLAGS = -I/opt/X11/include -DXWINDOW
 
 # OPTFLAGS is normally -O2.
 OPTFLAGS =  -O1 -g
-DEBUGFLAGS = # -DDEBUG -DOPTRACE
+DEBUGFLAGS = -DARRAYCHECK # -DDEBUG -DOPTRACE
 DFLAGS = $(DEBUGFLAGS) $(XFLAGS) -DRELEASE=351
 
 LDFLAGS = -L/opt/X11/lib -lX11 -lm