Ok, i just solved the problem :
First of all I built a standalone toolchain for my plateform
build/tools/make-standalone-toolchain.sh --toolchain=arm-linux-androideabi-4.9 --platform=android-23 --install-dir=../toolchain
Then in the build file I did this :
## Declare path and options
cyassl_lib_dir=/opt/zware/cyassl
## Set up variables to point to Cross-Compile tools
export CCBIN="/opt/ndk/toolchain/bin"
export CCTOOL="$CCBIN/arm-linux-androideabi-"
## Add Android NDK Cross Compile toolchain to path
export PATH=$CCBIN:$PATH
## Export our ARM/Android NDK Cross-Compile tools
export CC="${CCTOOL}gcc"
export RANLIB="${CCTOOL}ranlib"
export AR="${CCTOOL}ar"
./configure --build=i686-pc-linux-gnu --host=arm-linux-androideabi --enable-dtls --enable-psk --disable-shared --enable-static --prefix=$cyassl_lib_base/install
Lib is now recognized in my ndk project