Err: Couldn't open header file ...

While:  While compiling c files
 
Error:
    Path not found
    Couldn't open header file...

Reason:

    Header files directory not passed to compiler properley.

Solution:

    Normally we use this while configure package

    In SWIG, 
            gcc `php-config –includes` ***

    For Postgres,
            cc `pg_config –includedir-server` ***

    From this compiler didn't get the exact path of include dir.
    In postgres, configure command only throws this error. For that,

    Use include path directly with prefix by 'I' like
        Cc -I/usr/include/postgresql/8.3/server -fPIC -c example.c
    instead of
        Cc `pg_config –INCLUDEDIR-SERVER` -fpic -c example.c


    Ref: http://kpogre.sourceforge.net/tutorial06/index.html