Permission denied error while building for arm6

I have been trying to build the AppImageKit from source on a Raspberry Pi 0. I'm not using docker so I only executed the "build-binaries-and-appimage.sh". Using `sudo bash build-binaries-and-appimage.sh`, the process went upto 92% but then stopped with a `/bin/sh: 1: /home/pi/ftp/AppImageKit/src/embed-magic-bytes-in-file.sh: Permission denied` error. Now I'm not too familiar with which script does what, but i couldn't understand why this error happens even when I have `sudo`. I've attached the terminal output from `[ 38%] Performing install step for 'libarchive-EXTERNAL'` onwards since the entire log would be too large. What am I doing wrong ?
[error_log_build.txt](https://github.com/AppImage/AppImageKit/files/6319604/error_log_build.txt)