diff --git a/libsrc/cbm/Makefile b/libsrc/cbm/Makefile
index 34760cc24..525597119 100644
--- a/libsrc/cbm/Makefile
+++ b/libsrc/cbm/Makefile
@@ -4,6 +4,18 @@
 
 .SUFFIXES: .o .s .c
 
+#--------------------------------------------------------------------------
+# Programs and flags
+
+SYS	= none
+
+AS	= ../../src/ca65/ca65
+CC	= ../../src/cc65/cc65
+LD	= ../../src/ld65/ld65
+
+AFLAGS	= -t $(SYS) -I../../asminc
+CFLAGS	= -Osir -g -T -t $(SYS) --forget-inc-paths -I . -I ../../include
+
 #--------------------------------------------------------------------------
 # Rules