--- src/Makefile
+++ src/Makefile
@@ -62,8 +62,6 @@
 
 CFLAGS += -MMD -MP -O3 -I common \
           -Wall -Wextra -Wno-char-subscripts $(USER_CFLAGS) \
-          -DCA65_INC="$(CA65_INC)" -DCC65_INC="$(CC65_INC)" -DCL65_TGT="$(CL65_TGT)" \
-          -DLD65_LIB="$(LD65_LIB)" -DLD65_OBJ="$(LD65_OBJ)" -DLD65_CFG="$(LD65_CFG)" \
           -DBUILD_ID="$(BUILD_ID)"
 
 LDLIBS += -lm
