Arduino for STM32

OK digged in the STM32Cube documentation, and it's actually quite straight forward cd "C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\bin" .\STM32_Programmer_CLI.exe -c port=COM7 -r 0x08000000 65536 C:\read.bin .\STM32_Programmer_CLI.exe -c port=COM7 -w C:\read.bin 0x080...

Hi all, Years ago I have programmed a blue pill to function as my door alarm unit, which is running smoothly for years. Now I want to duplicate the functionality of this to a new blue pill. I have the source code, but it no longer compiles because it relies on old libraries of which I don't remember...