'Search flags for the libraries
>>> l = LibraryList([\'/dir1/liba.a\', \'/dir2/libb.a\', \'/dir1/liba.so\'])
>>> l.search_flags
\'-L/dir1 -L/dir2\'
Returns:
str: A joined list of search flags'

@property
def search_flags(self):

    return '    '.join([('-L' + x) for x in self.directories])
