$ gcc -DHAVE_GETCH=1 a.c e.c list.h
a.c: In function ‘paging’:
a.c:64: error: invalid operands to binary == (have ‘LINE’ and ‘void *’)
e.c: In function ‘add_line’:
e.c:17: error: conversion to non-scalar type requested
e.c:18: error: incompatible types in return
e.c:20: error: incompatible type for argument 1 of ‘free’
e.c:21: error: incompatible types in return

このエラー解消したいんですけどどうすればいいですか