[OnePlus 9 Pro] YileKu:
I tried building lineage OS 20 (lemonadep) and got and error:

breakfast lemonadep

In file included from build/make/core/config.mk:353:

In file included from build/make/core/envsetup.mk:352:

In file included from build/make/target/product/telephony_vendor.mk:21:

device/oneplus/lemonadep/device.mk:43: error: vendor/oneplus/lemonadep/lemonadep-vendor.mk does not exist..

09:35:40 dumpvars failed with: exit status 1

Device lemonadep not found. Attempting to retrieve device repository from LineageOS Github (http://github.com/LineageOS).

Found repository: android_device_oneplus_lemonadep

Default revision: lineage-20.0

Checking branch info

Using fallback branch: lineage-20

Checking if device/oneplus/lemonadep is fetched from android_device_oneplus_lemonadep

LineageOS/android_device_oneplus_lemonadep already fetched to device/oneplus/lemonadep

Syncing repository to retrieve project.

Fetching: 100% (1/1), done in 0.480s

repo sync has finished successfully.

Repository synced!

Looking for dependencies in device/oneplus/lemonadep

Looking for dependencies in device/oneplus/sm8350-common

Looking for dependencies in hardware/oplus

hardware/oplus has no additional dependencies.

Looking for dependencies in kernel/oneplus/sm8350

kernel/oneplus/sm8350 has no additional dependencies.

Done

In file included from build/make/core/config.mk:353:

In file included from build/make/core/envsetup.mk:352:

In file included from build/make/target/product/telephony_vendor.mk:21:

device/oneplus/lemonadep/device.mk:43: error: vendor/oneplus/lemonadep/lemonadep-vendor.mk does not exist..

09:35:45 dumpvars failed with: exit status 1

In file included from build/make/core/config.mk:353:

In file included from build/make/core/envsetup.mk:352:

In file included from build/make/target/product/telephony_vendor.mk:21:

device/oneplus/lemonadep/device.mk:43: error: vendor/oneplus/lemonadep/lemonadep-vendor.mk does not exist..

09:35:47 dumpvars failed with: exit status 1

** Don't have a product spec for: 'lineage_lemonadep'

** Do you have the right repo manifest?

Backed up to 18.1 and got a different error... any suggestions?

Thanks

Y-

In file included from build/make/core/config.mk:291:

In file included from build/make/core/envsetup.mk:266:

frameworks/native/build/phone-xhdpi-6144-dalvik-heap.mk:19: error: _nic.PRODUCTS.[[device/oneplus/lemonadep/lineage_lemonadep.mk]]: "vendor/oneplus/sm8350-common/sm8350-common-vendor.mk" does not exist.

18:40:33 dumpvars failed with: exit status 1

Device lemonadep not found. Attempting to retrieve device repository from LineageOS Github (http://github.com/LineageOS).

Found repository: android_device_oneplus_lemonadep

Default revision: lineage-18.1

Checking branch info

Checking if device/oneplus/lemonadep is fetched from android_device_oneplus_lemonadep

LineageOS/android_device_oneplus_lemonadep already fetched to device/oneplus/lemonadep

Syncing repository to retrieve project.

Fetching: 100% (1/1), done in 0.473s

repo sync has finished successfully.

Repository synced!

Looking for dependencies in device/oneplus/lemonadep

Looking for dependencies in device/oneplus/sm8350-common

Looking for dependencies in hardware/oneplus

hardware/oneplus has no additional dependencies.

Looking for dependencies in kernel/oneplus/sm8350

kernel/oneplus/sm8350 has no additional dependencies.

Done

In file included from build/make/core/config.mk:291:

In file included from build/make/core/envsetup.mk:266:

frameworks/native/build/phone-xhdpi-6144-dalvik-heap.mk:19: error: _nic.PRODUCTS.[[device/oneplus/lemonadep/lineage_lemonadep.mk]]: "vendor/oneplus/sm8350-common/sm8350-common-vendor.mk" does not exist.

18:40:37 dumpvars failed with: exit status 1

In file included from build/make/core/config.mk:291:

In file included from build/make/core/envsetup.mk:266:

frameworks/native/build/phone-xhdpi-6144-dalvik-heap.mk:19: error: _nic.PRODUCTS.[[device/oneplus/lemonadep/lineage_lemonadep.mk]]: "vendor/oneplus/sm8350-common/sm8350-common-vendor.mk" does not exist.

18:40:38 dumpvars failed with: exit status 1

** Don't have a product spec for: 'lineage_lemonadep'

** Do you have the right repo manifest?