I can not create a new Activity

I'm doing a project that uses the jar support v4. However, when I create a new Activity, the project has errors, as it informs that support v7 is required. Is it possible to continue developing this project using only v4, or has it been discontinued and is now only possible using v7?

Here's my Android_Manifest :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.exemploactionbar"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Holo.Light" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".NoticeActivity"
            android:label="@string/title_activity_notice" >
        </activity>
        <activity
            android:name=".TesteActivity"
            android:label="@string/title_activity_teste" >
        </activity>
    </application>

</manifest>