[NDK] [ANDROID_NDK]Error: Program "ndk-build" not found in PATH.

Bonjour,
Au cours de l’utilisation de l’Android NDK j’ai eu toujours ce problème.
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23:29:03 **** Auto Build of configuration Default for project iTesLabWatermarker ****
ndk-build /home/bilel/Bureau/AndoidDev/android-ndk-r10all 
Cannot run program "ndk-build": Unknown reason
 
Error: Program "ndk-build" not found in PATH
PATH=[/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:
/home/bilel/Bureau/AndoidDev/adt-bundle-linux-x86-20140702/sdk/tools:
/home/bilel/Bureau/AndoidDev/adt-bundle-linux-x86-20140702/sdk/platform-tools:ANDROID_NDK]

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ET voici mes configurations.

TERminal..

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bilel@bilel-Vostro-1015:~/Bureau/AndoidDev/android-ndk-r10$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/bilel/Bureau/AndoidDev/adt-bundle-linux-x86-20140702/sdk/tools:/home/bilel/Bureau/AndoidDev/adt-bundle-linux-x86-20140702/sdk/platform-tools:ANDROID_NDK
bilel@bilel-Vostro-1015:~/Bureau/AndoidDev/android-ndk-r10$ echo $ANDROID_NDK
/home/bilel/Bureau/AndoidDev/android-ndk-r10
bilel@bilel-Vostro-1015:~/Bureau/AndoidDev/android-ndk-r10$ cd /home/bilel/Bureau/AndoidDev/android-ndk-r10
bilel@bilel-Vostro-1015:~/Bureau/AndoidDev/android-ndk-r10$ ls
build               find-win-host.cmd  ndk-build.cmd  ndk-gdb-py      ndk-stack  prebuilt     remove-windows-symlink.sh  tests
docs                GNUmakefile        ndk-depends    ndk-gdb.py      ndk-which  README.TXT   samples                    toolchains
documentation.html  ndk-build          ndk-gdb        ndk-gdb-py.cmd  platforms  RELEASE.TXT  sources

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N.B: Opencv Is LIbrary? Checked

Pouvez vous m'aide S.V.P ? Merci d'avance. ;)

Cordialement.