[user@user-pc ~]$ yay -Sy gtkhash-thunar
:: Synchronizing package databases...
 endeavouros is up to date
 core is up to date
 extra is up to date
 community is up to date
 multilib is up to date
AUR Explicit (1): gtkhash-thunar-1.5-2
:: (1/1) Downloaded PKGBUILD: gtkhash-thunar
  1 gtkhash-thunar                   (Build Files Exist)
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> 1
:: Deleting (1/1): /home/user/.cache/yay/gtkhash-thunar
HEAD is now at 1e13f76 changed dependency of mbedtls to mbedtls2, this due to upstream changes
  1 gtkhash-thunar                   (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> n
==> Making package: gtkhash-thunar 1.5-2 (sex 02 jun 2023 10:13:06)
==> Retrieving sources...
  -> Downloading gtkhash-1.5.tar.xz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  435k  100  435k    0     0   402k      0  0:00:01  0:00:01 --:--:--  402k
==> Validating source files with sha256sums...
    gtkhash-1.5.tar.xz ... Passed
:: (1/1) Parsing SRCINFO: gtkhash-thunar
==> Making package: gtkhash-thunar 1.5-2 (sex 02 jun 2023 10:13:09)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Found gtkhash-1.5.tar.xz
==> Validating source files with sha256sums...
    gtkhash-1.5.tar.xz ... Passed
==> Removing existing $srcdir/ directory...
==> Extracting sources...
  -> Extracting gtkhash-1.5.tar.xz with bsdtar
==> Starting prepare()...
==> Sources are ready.
==> Making package: gtkhash-thunar 1.5-2 (sex 02 jun 2023 10:13:12)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> WARNING: Using existing $srcdir/ tree
==> Starting build()...
+ exec meson setup --prefix /usr --libexecdir lib --sbindir bin --buildtype plain --auto-features enabled --wrap-mode nodownload -D b_lto=true -D b_pie=true gtkhash-1.5 build -Dglib-checksums=true -Dlinux-crypto=true -Dmbedtls=true -Dnettle=true -Dbuild-caja=false -Dbuild-nautilus=false -Dbuild-nemo=false -Dbuild-thunar=true
The Meson build system
Version: 1.1.1
Source dir: /home/user/.cache/yay/gtkhash-thunar/src/gtkhash-1.5
Build dir: /home/user/.cache/yay/gtkhash-thunar/src/build
Build type: native build
Project name: gtkhash
Project version: 1.5
C compiler for the host machine: cc (gcc 13.1.1 "cc (GCC) 13.1.1 20230429")
C linker for the host machine: cc ld.bfd 2.40.0
Host machine cpu family: x86_64
Host machine cpu: x86_64
Compiler for C supports arguments -fno-common: YES
Compiler for C supports arguments -fvisibility=hidden: YES
Compiler for C supports arguments -pedantic: YES
Compiler for C supports arguments -Waggregate-return: YES
Compiler for C supports arguments -Wbad-function-cast: YES
Compiler for C supports arguments -Wcast-align: YES
Compiler for C supports arguments -Werror=implicit-function-declaration: YES
Compiler for C supports arguments -Wfloat-equal: YES
Compiler for C supports arguments -Wformat-nonliteral: YES
Compiler for C supports arguments -Wformat-security: YES
Compiler for C supports arguments -Wformat-signedness: YES
Compiler for C supports arguments -Wformat: YES
Compiler for C supports arguments -Wlogical-op: YES
Compiler for C supports arguments -Wmissing-declarations: YES
Compiler for C supports arguments -Wmissing-noreturn: YES
Compiler for C supports arguments -Wno-parentheses-equality: NO
Compiler for C supports arguments -Wredundant-decls: YES
Compiler for C supports arguments -Wshadow: YES
Compiler for C supports arguments -Wswitch-default: YES
Compiler for C supports arguments -Wundef: YES
Compiler for C supports arguments -Wwrite-strings: YES
Found pkg-config: /usr/bin/pkg-config (1.8.1)
Run-time dependency glib-2.0 found: YES 2.76.3
Run-time dependency gio-2.0 found: YES 2.76.3
Run-time dependency gtk+-3.0 found: YES 3.24.38
Run-time dependency libb2 found: YES 0.98.1
Run-time dependency libgcrypt found: YES 1.10.2-unknown
Header "gcrypt.h" has symbol "GCRY_MD_BLAKE2B_512" : YES
Header "gcrypt.h" has symbol "GCRY_MD_SHA3_512" : YES
Header "gcrypt.h" has symbol "GCRY_MD_SM3" : YES
Has header "linux/if_alg.h" : YES

gtkhash-1.5/meson.build:128:7: ERROR: C header 'mbedtls/md.h' not found

A full log can be found at /home/user/.cache/yay/gtkhash-thunar/src/build/meson-logs/meson-log.txt
==> ERROR: A failure occurred in build().
    Aborting...
 -> error making: gtkhash-thunar-exit status 4
 -> Failed to install the following packages. Manual intervention is required:
gtkhash-thunar - exit status 4