235     def patch_recipe_varfunc(varname, origvalue, op, newlines):  argument
238             pos = get_recipe_pos(varname)
244             if varname in existingnames and op in ['+=', '=', '=+']:
245                 if varname in remainingnames:
246                     outputvalue(varname, newlines)
247                     del remainingnames[varname]
250             if varname in values:
251                 existingnames.append(varname)
741     def popline(varname):  argument
743             if bbappendlines[i][0] == varname:
748     def appendline(varname, op, value):  argument
751             if item[0] == varname:
755             bbappendlines.append((varname, op, value))
811         def appendfile_varfunc(varname, origvalue, op, newlines):  argument
812             if varname == 'FILESEXTRAPATHS:prepend':
816             elif varname == 'PACKAGE_ARCH':
820             elif varname.startswith('do_install:append'):
821                 func = popline(varname)
831                 removevar = varname
832                 if varname in ['SRC_URI', 'SRC_URI:append%s' % appendoverride]:
834                     line = popline(varname)
840                     line = popline(varname)
861                         if ':append' in varname:
865                     if not newvalue and (op in ['+=', '.='] or ':append' in varname):
868                     if varname.endswith('()'):