FAQs and Common Error while building Custom ROMs.



Disclaimer: All these FAQs and Solutions are taken from my knowledge and experience if anything wrong please point out so I can correct it.And feel free to add more FAQs and Errors from your side



FAQ #1  : Easiest way to setup build environment ?

Their is a script will will make all the work easy by Akhil Narang XDA senior Member and great dev Steps to be followed:

git clone https://github.com/akhilnarang/scripts
cd scripts
bash setup

FAQ #2: Which is the best distro to build custom rom?

I will always recommend to use Ubuntu 14.04 Download Link : DOWNLOAD NOW

FAQ #3: If I have low internet speed how to sync sources that too 60Gb and all?

Use Google cloud Platform which is the best because internet speed syncs source within half an hour build speed max 2hour first build then less than 30mins

FAQ #4: Is any programming language required to study while building ROMs?

Absolutely  No since for making roms from source you just require BASIC English thats it and few logic how does fuctions work etc.

FAQ #5: I have MacBook can I built on it since it is having BASH terminal?

Sure you don’t need to install another distro inbuilt Mac OS is enough.

FAQ #6: While building it stopped what to do ?

Simplest way is copy whole data and paste in any IDE and search for “FAILED:” line and read it understand what made wrong then google how to fix it,Few common errors and their fixed are their below just bookmark if you need.

FAQ #7:I Googled still not found a solution how to fix it ?

Their are many ways ask on XDA else you get contact with developer of that rom message him and resolve it.

FAQ #8: Is there any full tutorial for NOOB users ?

FAQ #9: What is Cherry-picking is please explain?

It is actually taking a feature of one rom and then add to your rom by giving proper credits to author etc.There is a good tutorial for doing this refer to this How to apply patches to the source ?.This will surely help you a lot.

FAQ #10:  Is there any place where I can get full details of rom files folders etc ?

Yes there is an awesome post explaining everything. [GUIDE] Understanding the Android Source Code

FAQ #11: I have one commit which is commit but I need to add proper author to it what to do?

git commit --amend --author="NAME" This will add author to last commit

FAQ #12: I have done changes I need to overwrite the commit its not allowing asking for pull and retry like that.

Do same git push command just add -f tag so it overwrites the git. for e.g.: git push GitHub 7x -f instead of git push GitHub 7x .

FAQ #13: Any Simple way to resolve conflicts while cherry-picking  ?

The best way is to use search tool and search for “»>”,"«<","===" remove, add keep both depending on code.Second Method is by using GitHub as search.

FAQ #14: Is there any simpler way to check cherry-picked correctly or not since building whole ROM takes time.

Build only the required package to check if it worked correctly then build Rom as whole .For e.g. you made changes to kernel and device tree in that case just use time mka boot image rather than time mka bacon.

FAQ #15:How to remove snap camera from building?

Answer:Remove Snap from BoardConfig and use zip contents and manifest to see what permissions to do, use PRODUCT_COPY_FILES command

FAQ #16: How is flashable ZIP of kernels made ?

Android zips have updater-script which is programmed in edifier,You basically need to make a flashable zip which would write boot.img into /dev/block/bla/bla/boot.

FAQ #17: Should I dexpreopt my builds?

Not necessary it is just first boot speeding up and take extra size around 100mb more.

FAQ #18: What does boot.img contain?

It has  kernel and ramdisk

FAQ #19 What are BLOBS?

Blobs are vendor files and prebuilt libs which are found in system, importing them is copy paste + the mk file, It’s usually found in /system/vendor and /system/lib.

Common Errors:

All these errors I mention are faced by me and solution which I did is written along.

Common Error 1: Compile time error

intermediates/export_includes', needed by $user/$rom/out/target/product/oneplus2/obj/EXECUTABLES/wpa_supplicant_intermediates/import_includes', missing and no known rule to make it
make: *** [ninja_wrapper] Error 1

First check wheather your vendor repo is broken or not or is it included or not if not clone it from correct source. Clone wpa supplicant ,wpa_supplicant8 from lineageos and retry it

Common Error 2: Build is successful but its not booting what to do?

Make another build with permissive by adding androidboot.selinux=permissive to BoardConfig.mk it should work.

Common Error 3: I have synced device tree but device is not showing in breakfast nor lunch menu

Will show you how things are done.

Oneplus2 device tree modded for supporting VertexOS: 163acc80fc7969bfdac823a30d6c9bd31b6060b1.

Oneplus2 device tree modded for supporting Candy Rom: f0f95d2d3a03a43da91668f17f284a4b994d5f5f.

There will be so much commits like this just git search then your good to go. This must be general case for most of the rom and devices just refer this.

Common Error 4: Missing library and no rule to make it ( ninja error)

ninja: error: '/home/vibhoothiiaanand/nitrogen/out/target/product/oneplus2/obj/SHARED_LIBRARIES/libqdutils_intermediates/export_includes', needed by '/home/vibhoothiiaanand/nitrogen/out/target/product/oneplus2/obj/SHARED_LIBRARIES/libsurfaceflinger_intermediates/import_includes', missing and no known rule to make it
make: *** [ninja_wrapper] Error 1

This is common error and its due to missing hardware BLOBs so to fix this there are few things to clone these files are to cross checked if not clone from lineage


and for cloning I will show you how its done for Oneplus2

git clone https://github.com/LineageOS/android_hardware_qcom_display.git -b cm-14.1 hardware/qcom/display/msm8994
git clone https://github.com/LineageOS/android_hardware_qcom_audio.git -b cm-14.1 hardware/qcom/audio/msm8994
git clone https://github.com/LineageOS/android_hardware_qcom_media.git -b cm-14.1 hardware/qcom/media/msm8994
git clone https://github.com/LineageOS/android_hardware_qcom_display.git -b cm-14.1-caf-8994 hardware/qcom/display-caf/msm8994
git clone https://github.com/LineageOS/android_hardware_qcom_audio.git -b cm-14.1-caf-8994 hardware/qcom/audio-caf/msm8994
git clone https://github.com/LineageOS/android_hardware_qcom_media.git -b cm-14.1-caf-8994 hardware/qcom/media-caf/msm8994

Common Error 5: generic/goldfish missing and its needed by apns-conf.xml

device/generic/goldfish/data/etc/apns-conf.xml', needed by 
missing and no known rule to make it.

Just clone generic/goldfish from google This is due to the source is old in Lineage Source.

git clone https://android.googlesource.com/device/generic/goldfish device/generic/goldfish

6 Common Error 6: frameworks/native/build/phone-xxxhdpi-4096-dalvik-heap.mk does not exist.

Cherry-pick this commit https://github.com/CyanogenMod/android_frameworks_native/commit/6500d428ce816ffa0ba099221a4987ad7bfcb4ab Done it must be fixed

Common Error 7: Missing ro.product.model in build.prop

ERROR: couldn't find ro.product.model in build.prop

This is not that common but this happens while compiling fix is cherry-pick this commit git cherry-pick https://github.com/AICP/build/commit/df574f3e6ae115425b2c25e5b5e6772503ca0f65

Common Error 8: Model number unknown.

Go to device tree and open init/init*.cpp make device name and instead of  std::string device = property_get("ro..device"); -> std::string device = property_get("ro.product.device");

Common Error 9: Deleting obsolete path

Deleting obsolete path /home/vibhoothiiaanand/vertex/device/oneplus/oneplus2
Deleting obsolete path /home/vibhoothiiaanand/vertex/device/oppo/common
Deleting obsolete path /home/vibhoothiiaanand/vertex/kernel/oneplus/msm8894
Deleting obsolete path /home/vibhoothiiaanand/vertex/vendor/oneplus

This is due to not declaring repos in local manifest

Common Error 10: Broken gestures

For this two things must be noted - Kernel - Device common Both must match the node names. In case of oneplus2 in kernel: drivers/input/touchscreen/synaptics_driver_s3320.c, configpanel/src/com/cyanogenmod/settings/device/utils/Constants.java should match node declaration values

Common Error 11: Dex2oated errors


Usually error is like this

For this easy fix is disabling dexpreopt

Common error 12: JAVA `boot.art is missing

ninja: error: '/home/vibhoothiiaanand/vertex/out/target/common/obj/JAVA_LIBRARIES/rcscommon_intermediates/javalib.jar', needed by '/home/vibhoothiiaanand/vertex/out/target/product/oneplus2/dex_bootjars/system/framework/arm64/boot.art', missing and no known rule to make it
make: *** [ninja_wrapper] Error 1
make: Leaving directory `/home/vibhoothiiaanand/vertex'

For me this happened while building vertex for that I removed telephony entry from android_vendor_vertex/config/common.mk

Common Error 13: SHARED_LIBRARIES is needed by target.

/out/target/product/oneplus2/obj/SHARED_LIBRARIES/libdhcpcd_intermediates/export_includes', needed by '/home/coolmohammad98/cr/out/target/product/oneplus2/obj/EXECUTABLES/ipacm_intermediates/

For this clone  git clone https://github.com/lineageos/android_external_libnfnetlink and then your good to go

Thanks to MZO for helping out.