Your APP_BUILD_SCRIPT points to an unknown file using Android ndk-build

Question

I get the following error while trying to compile an Android NDK project:

ndk-build 
Android NDK: Your APP_BUILD_SCRIPT points to an unknown file: /home/lambergar/work/APIExample/jni/Android.mk    
/home/lambergar/android/ndk/android-ndk-r5c/build/core/add-application.mk:116: *** Android NDK: Aborting...    .  Stop.

The weird thing is, that the 'unknown file' (Android.mk) exists under the path reported as invalid.

try to build your project with the flag NDK_LOG set to 1: that is $NDK/ndk-build NDK_LOG=1 to see more information about this error... maybe [this](http://groups.google.com/group/android-ndk/browse_thread/thread/1c8511da02fa5e3d) helps you.. — Thanasis Petsas, Jun 27 '11 at 16:02

score 25 · Answer 1 · answered Oct 01 '12 at 18:34

25

Same problem (in Windows 7) but the cause is different.

After searching in the Environment parameters, I've found the evil thing named "NDK_PROJECT_PATH" which has value is an invalid path.

Deleted it and things are working again ;)

answered Oct 01 '12 at 18:34

Obelisk Sparrow

251
3
2

This is important! Other suggestions may lead people to add the NDK_PROJECT_PATH environment variable and point it to the NDK directory or something. If this exists, and you try to compile a new project, it will complain because it's looking for files in the NDK_PROJECT_PATH. I just ran into the same stupid issue. This solved it. – James Stone Aug 14 '15 at 10:06

score 19 · Answer 2 · answered Mar 04 '17 at 21:42

19

In my case the problem was with white spaces in the project path. In such case, change the project path folders and import the project again.

answered Mar 04 '17 at 21:42

Shayan Amani

5,787
1
39
40

2

The old new thing hitting us again and again ;) – Oct 15 '21 at 15:17

score 8 · Answer 3 · answered Aug 30 '17 at 16:46

8

Just saw this problem today. In my case actual problem was spaces inside path to project.

(yes, ndk-build will not compile your project if you have spaces inside folder name)

answered Aug 30 '17 at 16:46

Anton Malmygin

3,406
2
25
31

score 5 · Answer 4 · answered Jul 29 '11 at 09:12

5

I just had the same problem. I fixed it by creating a Application.mk in $NDK/apps/ndktestapp with following content:

APP_PROJECT_PATH := /cygdrive/c/workspace/MyApp

and then calling

make APP=ndktestapp

from the NDK-Root. Hope that helps.

answered Jul 29 '11 at 09:12

sege

81
1
7

1

For more flexibility, I would recommend `APP_PROJECT_PATH := $(call my-dir)` – JellicleCat Oct 31 '16 at 19:21

score 3 · Answer 5 · edited Jul 10 '14 at 19:37

3

You need to set the env variable NDK_PROJECT_PATH to the root of the project you are building. The root of your NDK project will typically contain the ./jni directory.

export NDK_PROJECT_PATH={root_of_project}

If your JNI code is in a library, then set NDK_PROJECT_PATH to the library project.

edited Jul 10 '14 at 19:37

Peter Gluck

8,168
1
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37

answered Apr 16 '14 at 15:42

Wakahiu Njenga

113
1
7

NDK project will typically contain the ./jni directory. – linjiejun Sep 28 '22 at 10:21

score 3 · Answer 6 · answered Aug 21 '18 at 11:09

3

Do not make any white space in the Project Directory. If errors come again then edit the build.gradle(Module:app) below buildTypes block and add those line like below:

 buildTypes {
    release {
       ......................
    }
}
sourceSets { main { jni.srcDirs = ['src/main/jni/','src/main/jniLibs/'] } }
externalNativeBuild {
    ndkBuild {
        path 'build/intermediates/ndk/debug/Android.mk'
    }
}

answered Aug 21 '18 at 11:09

Istiyak

693
6
15

Although this is not an accepted answer (because there is no white space in project path), it help me find the problem in my project. – amrezzd Jul 16 '19 at 08:23

score 3 · Accepted Answer · answered Aug 01 '11 at 23:26

3

I solved the problem by adding a new build to the project and voila, it works... Don't know what was the problem with the CLI build though.

answered Aug 01 '11 at 23:26

LambergaR

2,433
4
24
34

score 3 · Answer 8 · edited Aug 26 '18 at 03:41

Just spent an hour or two trying to figure this one out. Many, many people have had this problem. But as I found out I actually did not have a file name Android.mk it was named Andriod.mk and that was enough to cause me a lot of trouble. Sorry about my original rant but that was the whole problem in the end. I suggest if you have this problem you should check everything until you find something wrong.

This fixed me right up. Thanks guys you put me on the right track anyway.

score 2 · Answer 9 · answered Nov 25 '19 at 10:29

2

Please remove these directories

rm -rf .externalNativeBuild //if exits

rm -rf app/.externalNativeBuild

rm -rf app/.cxx/ //if exits

rm -rf app/build/

then rebuild the project.

answered Nov 25 '19 at 10:29

Mushahid Gillani

723
7
19

This fixed the issue for me. I had recently refactored my module name in Android Studio. The old project folder name had been cached in the `.externalNativeBuild` configuration files (which store the args passed into ndk-build) – Hamy Apr 03 '20 at 16:34
No help for me, building without android studio (just ndk-build), although weirdly in my case, I have the exact same .mk files for another project that does work. – Soylent Graham Aug 09 '20 at 13:29

score 1 · Answer 10 · answered Nov 14 '12 at 04:26

1

as the same as @phavens, i think that only wrong with the word Android.mk and android.mk file, just spent for 5 minutes .. hehe

answered Nov 14 '12 at 04:26

puputCantik

119
5

Gradle paths seem to be case sensitive, even on Windows! `android.mk != Android.mk`. – l33t Dec 29 '18 at 22:15

score 1 · Answer 11 · answered Mar 07 '18 at 22:55

1

in my case the project folder name had a space in it removed the space re imported it to Android Studio and that solved the problem

answered Mar 07 '18 at 22:55

rn0rdin

26
5

score 1 · Answer 12 · answered Apr 17 '19 at 02:08

1

Details of the problem:

Android NDK: Your APP_BUILD_SCRIPT points to an unknown file: /jni/Android.mk ...: *** Android NDK: Aborting... . Stop. Usually this is not the path of your project, so the reason for this error is that ndk could not find the correct Android.mk file path. solution:

Add NDK_PROJECT_PATH to "./" in the environment variable, the purpose is to tell the NDK that the jni currently to be compiled is located in the directory where the project is located.

answered Apr 17 '19 at 02:08

冯剑龙

569
8
22

This was my fix! My `ndk-build NDK_PROJECT_PATH=/xxx/` command line was incorrect [path] where `/xxx/` matches `/xxx/jni/android.mk` – Soylent Graham Aug 09 '20 at 13:35

score 1 · Answer 13 · answered Aug 03 '21 at 08:32

1

I encountered similiar probblems as in this topic. My solution is: firstly check the file exist in the correct path. Secondly, if your path have any whitespace, remove it or relocate your project to a simple path. Then rebuild it.

answered Aug 03 '21 at 08:32

Mingze Li

360
1
10

score 0 · Answer 14 · answered Oct 16 '15 at 00:14

0

I just installed Android-NDK and tried "ndk-build". I had exactly the same error. Here is how I beat it.

bash

export NDK_PROJECT_PATH={root_of_android_ndk}/samples/hello-jni

./ndk-build

This worked.

answered Oct 16 '15 at 00:14

Lenvanthis

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score 0 · Answer 15 · answered Aug 24 '16 at 05:08

0

Inside Android.mk file, you give the path where the jni folder loacted... in your case ARTOOLKIT_DIR :=/home/lambergar/work/APIExample/

answered Aug 24 '16 at 05:08

Thorang Katchen Ale

21
5

score 0 · Answer 16 · answered Sep 06 '19 at 19:35

0

For me, deleted the .gradle and app/.externalNativeBuild directories and it worked.

answered Sep 06 '19 at 19:35

A.A

2,603
1
18
22

score 0 · Answer 17 · answered Nov 17 '22 at 20:41

I also had space in the path for one of the folders. I struggled for 2-3 hrs understanding the problem and wondering why it said it is not able to find a file in a path which I was able to see. On seeing answers here, I removed space in one of the foldername in the path and voila, it started working.

score -1 · Answer 18 · answered Nov 07 '16 at 16:03

-1

Gradle Experimental plugein in Android Studio add support for Native project build.

answered Nov 07 '16 at 16:03

Sadegh Ghanbari

1,271
15
29

Your APP_BUILD_SCRIPT points to an unknown file using Android ndk-build

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