diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -38,9 +38,12 @@ SI5351_INCLUDES = -Ilib/si5351
 JTENCODE_INCLUDES = -Ilib/jtencode
 
 # USER_CFLAGS: user C flags (enable warnings, enable debug info)
-USER_CFLAGS = -Wall -g -ffunction-sections -fdata-sections -Os -fno-common --function-sections -fdata-sections -flto
+USER_CFLAGS = -Wall -g -ffunction-sections -fdata-sections -Os -fno-common --function-sections -fdata-sections 
+#USER_CFLAGS += -flto
+
 # USER_LDFLAGS:  user LD flags
-USER_LDFLAGS = -flto -fno-exceptions -ffunction-sections -fdata-sections -Wl,--gc-sections 
+USER_LDFLAGS = -fno-exceptions -ffunction-sections -fdata-sections -Wl,--gc-sections 
+#USER_LDFLAGS += -flto
 USER_LDFLAGS += --static
 #USER_LDFLAGS += -nostartfiles