* drop hardcoded -O2 flag from CFLAGS
* fix hardcoded `make` and hardcoded -j4 flags
* respect CFLAGS when linking

--- hdparm-9.60/Makefile
+++ hdparm-9.60/Makefile
@@ -13,7 +13,7 @@
 CC ?= gcc
 STRIP ?= strip
 
-CFLAGS := -O2 -W -Wall -Wbad-function-cast -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fkeep-inline-functions -Wwrite-strings -Waggregate-return -Wnested-externs -Wtrigraphs $(CFLAGS)
+CFLAGS += -W -Wall -Wbad-function-cast -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fkeep-inline-functions -Wwrite-strings -Waggregate-return -Wnested-externs -Wtrigraphs
 
 INSTALL = install
 INSTALL_DATA = $(INSTALL) -m 644
@@ -22,14 +22,13 @@
 
 OBJS = hdparm.o identify.o sgio.o sysfs.o geom.o fallocate.o fibmap.o fwdownload.o dvdspeed.o wdidle3.o apt.o
 
-all:
-	$(MAKE) -j4 hdparm
+all: hdparm
 
 static:
 	LDFLAGS=-static $(MAKE)
 
 hdparm: Makefile hdparm.h sgio.h $(OBJS)
-	$(CC) $(LDFLAGS) -o hdparm $(OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o hdparm $(OBJS)
 	$(STRIP) hdparm
 
 hdparm.o:	hdparm.h sgio.h