Before cross-compiling cross-compiling applications for your target, you need to install the Software Development Kit (SDK SDK ) - which contains the cross-compilation toolchain toolchain - and set up the cross-compilation environment on your host. The toolchain for each supported target contains a 32-bit and a 64-bit library for gcc. The toolchain and the environment-setup script are wrapped together inside a toolchain installer in the form of a shell script. Name of the installer: Name of the environment-setup scripts: The cross-compilation toolchain for t4240rdb-64b is packaged as follows: The toolchain contains two libs: lib (32-bit) and lib64 (64-bit). The installer wraps two environment-setup scripts. Which script you run selects which lib will be used by gcc. This way, both 32-bit applications and 64-bit applications can be cross-compiled for t4240rdb-64b. There are currently problems with 32-bit applications on the 64-bit T4240, see "Known Problems" in the Release Information. Do as in the example below to install the SDK and set up the cross-compilation environment: Get the cross-compilation toolchain installer; either a precompiled one (A) or build it yourself (B). The quickest alternative is to use a precompiled installer for your host and target. Download the appropriate installer from the server appointed to you by Enea. You find the installer in the sdk directory on the download site: $ wget /t4240-64b/sdk/\ ... or build your own cross-compilation toolchain. First source the build environment setup script to create a <build_dir> with conf files, then run bitbake with option -c populate_sdk to build the toolchain and wrap it inside an installer, saved in <build_dir>/tmp/deploy/sdk/. $ source enea-init-build-env -b build_t4240rdb $ bitbake -c populate_sdk $ cd ../build_t4240rdb/tmp/deploy/sdk/ Run the installer to unpack the cross-compilation toolchain and the environment-setup script: $ chmod 770 \ $ ./ When prompted, select to install the SDK in the desired directory, referred to as <sdkdir>, by default /opt/enea/<sdkver>. The installer unpacks the environment setup script in <sdkdir> and the toolchain under <sdkdir>/sysroots. Choose a unique directory for each toolchain. Installing a second toolchain of any type (buildtools toolchain or cross-compilation toolchain) in the same directory as a previously installed one will break the $PATH variable of the first one. Setup the toolchain environment by sourcing the environment-setup script, here exemplified for 32-bit toolchain:$ source <sdkdir>/ Once the cross-compilation toolchain is in place and the environment set up, you can proceed with Cross-Compiling Applications from Command Line.. The above instructions and the files on the download site should provide you with all you need to be able to cross-compile applications for your target. INFO: Corresponding Yocto documentation is available at . Note that the file names mentioned in the Yocto documentation differ from the ones in the Enea Linux distribution.