about Makefile and Macro

Helllo,,, guys..

i'm kind of newbies for c++

here is my problem..

i'm now taking a CPSC course
and one of the lab that i'm doing is about Makefile

here is my Makefile

Code:

CC = gcc                                # Compiler

CFLAGS = -D_POSIX_SOURCE=1		# Compiler flags
## OLD CFLaG ##  -c -I./lib                     

LFLAGS =                                # Linker flags

LIBS = -L./usr/X/lib -lXaw -lXmu -lXt -lX11 -lsx        # Library ## old


## LIBS = libsx.a		                # Library ## new

SRCS = button.c colormap.c Dialog.c draw.c DrawingA.c font.c libsx.c list.c menu.c misc.c popups.c scrollbar.c string_entry.c toggle.c version.c 

PROG_OBJS =  $(SRCS:.c:.o)              # Object files

PROG = courses                          # Executable name

RM = /bin/rm -f                          # For cleaning

 
$(PROG): $(PROG_OBJS)
	$(CC) $(LFLAGS) $(PROG_OBJS) $(LIBS) -o $(PROG)

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

.SUFFIXES: .c
 
.c.o:
	$(CC) $(CFLAGS) -c $<
 
clean:
	rm -f  $(PROG_OBJS) $(PROG) *~

depend:
	makedepend -- $(CFLAGS) -- $(SRCS)

i'm now having a problem with
Define macro _POSIX_SOURCE with the string "1"

i am asked to define this macro with the value "1"
i then insert this

Code:

-D_POSIX_SOURCE=1

to my CFLAGS

i believe that everythign should be fine; however, i still receive this err

bowen:~/tom/lab2/libsx/src> make Makefile
mksh: Fatal error in reader: = missing from replacement macro reference
Current working directory /galiano1/i3x3/tom/lab2/libsx/src

i ran this command in secureCRT, and fixing Makefile in X-win32

anybody can help me with the question

i'd be really appreciate
i really need it within the next 8-10 hr if it's possible...
thx very muchh guyss

I think makefiles are system dependent, and I've only used Microsoft... and even then I've usually copied/modified an existing file.

My guess: You probably can't have two equal signs on a line.