--- Makefile.local.orig
+++ Makefile.local
@@ -98,3 +98,10 @@
 # LDFLAGS+= ${FSANITIZE}
 # DEBUG:= -O0 -g3
 ###
+
+PREFIX=___PREFIX___
+CALC_INCDIR:= ${PREFIX}/include/calc
+USE_READLINE:= -DUSE_READLINE
+READLINE_LIB:= -L${PREFIX}/lib -lreadline
+READLINE_EXTRAS:= -lhistory -lncurses
+ARCH_CFLAGS:=