A while ago, I installed the iSH app on my iPad which made it possible for me to develop Python and C code as well as use it as an SSH client. However, I ran into an issue when trying to compile C code because the compiler couldn’t resolve stdio.h. The following excerpt from StackOverflow resolves the issue:

Install libc-dev in addition to GCC, or just install build-base for everything (alpine-sdk is probably an overkill). To install run the following command: