Hi, i have installed Pre-built GNU toolchain via sudo apt-get install gcc-arm-linux-gnueabi the installed version now is: arm-linux-gnueabi-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609 when cross compiling arm android with ndk, usually different toolchain has to be selected for each android version, depending on API level example API level 9 = 2.3.6 Gingerbread API level 19 = 4.4.2 KitKat API level 21 = 5.0.2 Lollipop Q: How to set/select the API level on GNU toolchain? could not find the answer in documentation you can answer directly here (or if no veto, i will post your answer) https://stackoverflow.com/questions/48348342 many thanks for support! greetings from germany Alexander Reiche