XMINCDIR = -I/user/include
XMLIBDIR = -L/usr/lib
XLIBS    = -lXm -lX11 -lXt

CFLAGS =   -g -O2
CC     = gcc

/popup: popup.c
  $(CC) -o popup popup.c $(CFLAGS) $(XMINCDIR) $(XMLIBDIR) $(XLIBS)

gcc -o popup popup.c -g -I/usr/X11R6/include -L/usr/lib -L/usr/X11R6/lib -lXm -lX11 -lXt