Makefile, options, and lcd stuff

Makefile

@@ -1,20 +1,22 @@
 CC=clang
-CFLAGS=-std=c99 -g
+CFLAGS=-std=c99
 LD=clang
 LDFLAGS=-lgpio -lfigpar
-OBJS=main.o util.o lcd.o ths.o
-OUTFILE=rpi4b-temp-humidity
+SRCS=src/main.c src/util.c src/lcd.c src/ths.c
+PROG=rpi4b-temp-humidity
 
 .include "config.mk"
 
-${OUTFILE}: ${OBJS}
-	${LD} ${LDFLAGS} -o $@ ${OBJS}
+OBJS=${SRCS:C/^src/bin/:C/.c$/.o/}
+bin/${PROG}: ${OBJS}
+	${LD} ${LDFLAGS} -o ${@} ${OBJS}
 
 main.o util.o lcd.o ths.o: util.h
 main.o lcd.o: lcd.h
 main.o ths.o: ths.h
 
-.c.o:
+${OBJS}: ${.TARGET:C/^bin/src/:C/.o$/.c/}
+	@mkdir -p bin/
 	${CC} ${CFLAGS} -c\
 -DDEFAULT_CONFIG_PATH="\"${DEFAULT_CONFIG_PATH}\""\
 -DDEFAULT_GPIO_DEVICE="\"${DEFAULT_GPIO_DEVICE}\""\
@@ -23,10 +25,10 @@ main.o ths.o: ths.h
 -DDEFAULT_FAIL_KEY="\"${DEFAULT_FAIL_KEY}\""\
 -DDEFAULT_FAIL_LIMIT="${DEFAULT_FAIL_LIMIT}"\
 -DDEFAULT_LCD_VERSION="\"${DEFAULT_LCD_VERSION}\""\
-$<
+-o ${@} ${.ALLSRC}
 
 clean:
-	rm -f ${OUTFILE} ${OBJS}
+	rm -rf bin/
 
 .SUFFIXES: .c .o
 .PHONY: clean