Install GNU Coreutils, GCC compiler, and GNU Make. It should come with an assembler (as) and a linker (ld). Run the following to build.
make
The binary file will be named postfix-translator by default.
The program has the ability to output machine code for RISC-V architecture as well.
This program is written for X86_64 (64 bit) GNU/Linux systems. It contains system calls that talk directly to the kernel. In this state, it will not work in other operating systems. Operations involving CPU registers are cross platform, but lines containing syscall need to be edited manually for other operating systems.