SRCS = $(wildcard *.c)
PROGS = $(patsubst %.c,%,$(SRCS))

#CFLAGS = -g -lpthread -std=c11
CFLAGS = -g -lpthread 
CC=/usr/local/gcc/6.2/bin/gcc
CC=/usr/local/gcc/5.4/bin/gcc
CC=/usr/local/gcc/5.2/bin/gcc
CC=/usr/local/gcc/4.9.0/bin/gcc
CC=/usr/bin/gcc # old
CC=/usr/local/gcc/6.3/bin/gcc
CC=/usr/bin/gcc # old

all: $(PROGS)

%: %.c
	$(CC) $(CFLAGS)  -o $@ $<

clean:
	rm $(PROGS)