(IMPORTANT/URGENT) Regarding Missing Files in bash source code?

[Humanities Clinic]

Dear Person-in-Charge

I am facing problems trying to compile Bash 3.2.57 for Mac OS. I am
choosing to compile this because that's the default version of my Bash
executable that was shipped with my OS.

All the problems have got to do with missing includes. Please see:

gcc  -DPROGRAM=bash -DCONF_HOSTTYPE=i386 -DCONF_OSTYPE=darwin17.7.0
-DCONF_MACHTYPE=i386-apple-darwin17.7.0 -DCONF_VENDOR=apple
-DLOCALEDIR=/usr/local/share/locale -DPACKAGE=bash -DSHELL -DHAVE_CONFIG_H
-DMACOSX   -I.  -I. -I./include -I./lib -I./lib/intl
-I/Volumes/Untitled-2-bigger/zzDEVELOP/bash/bash-3.2.57-BUILD/lib/intl  -g
-O2 -c version.c
version.c:27:10: fatal error: 'version.h' file not found
#include "version.h"

gcc  -DPROGRAM=bash -DCONF_HOSTTYPE=i386 -DCONF_OSTYPE=darwin17.7.0
-DCONF_MACHTYPE=i386-apple-darwin17.7.0 -DCONF_VENDOR=apple
-DLOCALEDIR=/usr/local/share/locale -DPACKAGE=bash -DSHELL -DHAVE_CONFIG_H
-DMACOSX   -I.  -I. -I./include -I./lib -I./lib/intl
-I/Volumes/Untitled-2-bigger/zzDEVELOP/bash/bash-3.2.57-BUILD/lib/intl  -g
-O2 -c jobs.c
jobs.c:72:10: fatal error: 'builtins/builtext.h' file not found
#include "builtins/builtext.h"

I double-checked the original folder in
http://ftp.gnu.org/gnu/bash/bash-3.2.57.tar.gz. It's true these files are
missing.

May I know why is this so, and how this can be rectified?

I see there is folder of patches. However I am new to do this and not sure
how to make use of the patch. Is there a guide on how to do this, if
patches is the solution?