def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def install_links(self):
        """Add symlinks into bin/, lib/ (eg, for other applications)"""
        # Make build log visible - it contains OpenFOAM-specific information
        with working_dir(self.projectdir):
            os.symlink(
                join_path(os.path.relpath(self.install_log_path)),
                join_path('log.' + str(self.foam_arch)))

        if not self.config['link']:
            return

        # ln -s platforms/linux64GccXXX/lib lib
        with working_dir(self.projectdir):
            if os.path.isdir(self.archlib):
                os.symlink(self.archlib, 'lib')

        # (cd bin && ln -s ../platforms/linux64GccXXX/bin/* .)
        with working_dir(join_path(self.projectdir, 'bin')):
            for f in [
                f for f in glob.glob(join_path('..', self.archbin, "*"))
                if os.path.isfile(f)
            ]:
                os.symlink(f, os.path.basename(f))