My makefile could not find header file

Question

I have write a simple makefile

 1 LIBS= -L /usr/local/pgsql/lib
 2 INCL= -I /usr/local/pgsql/include -I/home/name/
 3 
 4 pg: pg.o
 5     gcc -o  pg pg.o  $(LIBS) -lpq
 6 
 7 pg.o: pg.c
 8     gcc -c $(INCL) $(LIBS) pg.c

Under the folder of name, there are three files: pg.c, timer.c, timer.h but it reports error of could not find timefunctions. what's wrong with my makefile? thanks. The error is

 gcc -o  pg pg.o  -L /usr/local/pgsql/lib -lpq
 pg.o: In function `main':
 pg.c:(.text+0x91): undefined reference to `createTimer'
 pg.c:(.text+0xa1): undefined reference to `startTimer'
 pg.c:(.text+0x167): undefined reference to `endTimer'
 ...
 pg.c:(.text+0x214): undefined reference to `displayTimer'
 pg.c:(.text+0x220): undefined reference to `destroyTimer'
 collect2: error: ld returned 1 exit status
 make: *** [pg] Error 1

Answer 1

You haven't given us enough information to be certain, but it might be enough to add timer.o to the prerequisite list of the pg rule:

pg: pg.o timer.o
    gcc -o pg $^ $(LIBS) -lpq