platform_manifest_twrp_omni/twrp-extras.xml

<?xml version="1.0" encoding="UTF-8"?>
<manifest>
    <remote name="TeamWin"
            fetch="https://github.com/TeamWin"
            review="https://gerrit.twrp.me" />

    <remote name="LineageOS"
            fetch="https://github.com/LineageOS"
            review="https://review.lineageos.org" />

<!-- TWRP lives in TeamWin android-9.0 -->
    <project path="bootable/recovery" name="android_bootable_recovery" remote="TeamWin" revision="android-9.0"/>
    <project path="external/python3" name="android_external_python3" remote="TeamWin" revision="android-9.0"/>

<!-- Include external LineageOS repos for bash & nano -->
    <project name="android_external_bash" path="external/bash" remote="LineageOS" revision="cm-12.1" />
    <project name="android_external_nano" path="external/nano" remote="LineageOS" revision="cm-12.1" />
    <project name="android_external_libncurses" path="external/libncurses" remote="LineageOS" revision="cm-12.1" />
    <project name="android_external_openssh" path="external/openssh" remote="LineageOS" revision="cm-12.1" />
</manifest>