Cross-compilation is the process of compiling code for one architecture (often
called the target) on a different system, usually called the host.
Cross-compilation of the SCST kernel modules is possible as follows:
1. Download the Linux kernel source code and also the SCST source code.
2. Install the appropriate cross-compiler, e.g. as follows:

     zypper install cross-arm-gcc9

3. Store the cross-compilation prefix and architecture names in the
   CROSS_COMPILE and ARCH environment variables, e.g. as follows:

     export CROSS_COMPILE=/usr/bin/arm-suse-linux-gnueabi-
     export ARCH=arm

4. Build the Linux kernel.

     cd $HOME/software/linux-kernel
     make

5. Cross-compile the SCST core modules with the same toolchain. For example:

     export KDIR=$HOME/software/linux-kernel
     export PASS_CC_TO_MAKE=1
     export CC=${CROSS_COMPILE}gcc
     cd scst.git
     make scst

`ARCH` and `CROSS_COMPILE` configure the kernel build. They do not configure
the user-space build: programs under usr/ use `CC` directly and scstadmin uses
Perl MakeMaker. Cross-compiling the entire repository or building packages
therefore also requires a target-aware user-space toolchain and packaging
environment. `make rpm` by itself is not a generic cross-compilation method.