Get X-CUBE-53L1A1 software package: http://www.st.com/en/ecosystems/x-cube-53l1a1.html
Unzip STM32CubeExpansion zip file somewhere and make a symbolic link to it:
ln -s your_STM32CubeExpansion_53L1A1_V2.0.1_dir main/symlink-STM32CubeExpansion_53L1A1_V2.0.1
or simply unzip in main/.
Make.
[stlib-v1.0.0 branch] is the branch for the previous STM32CubeExpansion_53L1A1 library version 1.0.0.