Question

I am modifying an old makefile in order to build a C extension for postgreSQL. The Makefile currently looks like this:

PGLIB = /usr/lib/postgresql/8.4/lib
PQINC = /usr/include/postgresql/8.4/server        
CC=gcc

override CFLAGS+= $(CFLAGS_SL) -DPG_AGGREGATE 

SHLIB = pg_myextlib

SRC =  foo.c \
       foobar.c

OBJS = foo.o \       
       foobar.o

all: $(OBJS)
    $(CC) -shared -o $(SHLIB)$(DLSUFFIX) $(OBJS) -I$(PQINC)
    cp *.so $(PGLIB)

clean:
    rm -f $(SHLIB) $(OBJS) 

The error I get when I run make is:

common.h:58:22: error: postgres.h: No such file or directory

Which suggests that the include path is not being added (the file exists in $PQINC).
Its a long time since I wrote the Makefile – and I haven’t written many since. As an aside, I am pretty sure that ‘shared’ is not the gcc flag to build shared libs on Ubuntu (my current dev box) – I think the flag should be ‘fPIC’ – can someone confirm this?

I am runing gcc v4.4.3 on Ubuntu 10.0.4 and compiling for use with PG 8.4

Answer 1

Try moving the -I$(PQINC) from target all to the end of line that starts with override CFLAGS.