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Describe the bug
I tired to build this library with build/build-posix.sh on arch linux, only to find the generated headers has a bunch of errors in it.
The generated header files & static library can't be build to another program with the following commands because of the errors in it.

gcc -g -I./include test.c -o out -L./lib -lvim

To Reproduce

1. set environment variable cur_install to "/tmp/libvim-test-export"
2. run build/build-posix.sh
3. open vim.h under generated include path

Expected behavior
No errors

Screenshots
image

Environment (please complete the following information):

• libvim version: last commit 9ade7d1
• OS: Linux arch 5.13.9-arch1-1 #1 SMP PREEMPT 2021年8月08日 11:25:35 +0000 x86_64 GNU/Linux
• Terminal: alacritty (does that matter?)