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-rw-r--r--esp8266/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/esp8266/Makefile b/esp8266/Makefile
index 7019335065..b06f6787a3 100644
--- a/esp8266/Makefile
+++ b/esp8266/Makefile
@@ -14,7 +14,7 @@ BAUD = 115200
CROSS_COMPILE = xtensa-lx106-elf-
ESP_SDK = $(shell $(CC) -print-sysroot)/usr
-INC = -I.
+INC += -I.
INC += -I..
INC += -I../stmhal
INC += -I../lib/mp-readline