-out.write ('MAN_ROFF_FILES := ' + ' \\\n\t'.join(roff_files)+'\n')
-out.write ('MAN_RST_FILES := ' + ' \\\n\t'.join(rst_files)+'\n')
+with open(outfile, 'w') as out:
+ out.write('MAN_ROFF_FILES := ' + ' \\\n\t'.join(roff_files) + '\n')
+ out.write('MAN_RST_FILES := ' + ' \\\n\t'.join(rst_files) + '\n')