1# make<a name="EN_US_TOPIC_0000001078026808"></a> 2 3## Introduction 4 5SDK support using both LLVM and GCC toolchain to build Trusted Application. 6 7before building Trusted Application please install target toolchain, and add the toolchain path to system environment.<br> 8for example:<br> 9``` 10export PATH=$PATH:"/path/to/toolchains/clang+llvm/bin/" 11``` 12or 13``` 14export PATH=$PATH:"/path/to/gcc-linaro-aarch64-linux-gnu/bin/" 15``` 16 17we suggust to use LLVM as it support more security compile options, in this SDK it assume LLVM is used by default. 18 19if you need to use GCC to build your Trusted Application, 20please add CONFIG_GCC to your system environment before build your Trusted Application.<br> 21using command:<br> 22``` 23export CONFIG_GCC=y 24```