The hard tier is software that assumes a full desktop Linux box. GPU loaders, shared memory, process watchers, JIT engines, and dependency trees so big nobody on the upstream team has read all of them.

I maintain a good chunk of that tier for Termux. Here's what the patches look like, and what each one is really saying.

Bun: nine patches, three of them syscalls

Bun has the longest patch stack I deal with regularly. The filenames tell most of the story:

Patch What it fixes

0001 default to symlink install backend bun install uses symlinks by default

0002 remove Werror and unsupported flags Build stops failing on warnings and flags this toolchain lacks

0003 disable close_range Skip a syscall Android may refuse

0004 set termux tmpdir Temp files go to $PREFIX/tmp instead of /tmp

0005 fix bash completion empty regex Completion generation no longer chokes

0006 fix symlink bin chmod chmod on symlinked binaries stops failing

0007 disable pidfd_open Another filtered syscall, another fallback

0008 disable…