llpp make error

:: Proceed with installation? [Y/n]
(6/6) checking keys in keyring                                                                                     [--------------------------------------------------------------------] 100%
(6/6) checking package integrity                                                                                   [--------------------------------------------------------------------] 100%
(6/6) loading package files                                                                                        [--------------------------------------------------------------------] 100%
(6/6) checking for file conflicts                                                                                  [--------------------------------------------------------------------] 100%
:: Processing package changes...
(1/6) installing docbook-xml                                                                                       [--------------------------------------------------------------------] 100%
(2/6) installing docbook-xsl                                                                                       [--------------------------------------------------------------------] 100%
(3/6) installing asciidoc                                                                                          [--------------------------------------------------------------------] 100%
Optional dependencies for asciidoc
    graphviz: graphviz-filter [installed]
    lilypond: music-filter
    imagemagick: music-filter [installed]
    source-highlight: source-highlight-filter
    dblatex: pdf generation
    fop: alternative pdf generation
    w3m: text generation
    lynx: alternative text generation
(4/6) installing libmupdf                                                                                          [--------------------------------------------------------------------] 100%
(5/6) installing ocaml                                                                                             [--------------------------------------------------------------------] 100%
Optional dependencies for ocaml
    ncurses: advanced ncurses features [installed]
    tk: advanced tk features
(6/6) installing ocaml-lablgl                                                                                      [--------------------------------------------------------------------] 100%
:: Running post-transaction hooks...
(1/1) Arming ConditionNeedsUpdate...
==> Making package: llpp 36-1 (Sun 18 Sep 2022 18:11:53 BST)
==> Retrieving sources...
  -> Updating llpp git repo...
  -> Found system-makedeps.patch
==> Validating source files with b2sums...
    llpp ... Skipped
    system-makedeps.patch ... Passed
 -> asciidoc not satisfied, flushing install queue
==> Making package: llpp 36-1 (Sun 18 Sep 2022 18:12:08 BST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Updating llpp git repo...
  -> Found system-makedeps.patch
==> Validating source files with b2sums...
    llpp ... Skipped
    system-makedeps.patch ... Passed
==> Removing existing $srcdir/ directory...
==> Extracting sources...
  -> Creating working copy of llpp git repo...
Cloning into 'llpp'...
done.
Switched to a new branch 'makepkg'
==> Starting prepare()...
patching file build.bash
==> Sources are ready.
==> Making package: llpp 36-1 (Sun 18 Sep 2022 18:12:48 BST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> WARNING: Using existing $srcdir/ tree
==> Removing existing $pkgdir/ directory...
==> Starting build()...
generating build/confstruct.ml
  keys.cmi
 wsi/x11/wsi.cmi
 utils.cmi
 utf8syms.cmo
   parser.cmi
   confstruct.cmo
  config.cmo
 uiutils.cmi
 help.cmi
  lablGL/raw.cmi
 glutils.cmi
   lablGL/gl.cmi
  lablGL/glPix.cmi
 lablGL/glTex.cmi
 lablGL/glMisc.cmi
 lablGL/glMat.cmi
 lablGL/glFunc.cmi
 lablGL/glDraw.cmi
 lablGL/glClear.cmi
 lablGL/glArray.cmi
 ffi.cmo
 main.cmi
main.cmo
keys.cmo
wsi/x11/wsi.cmo
utils.cmo
parser.cmo
uiutils.cmo
help.cmo
lablGL/raw.cmo
glutils.cmo
lablGL/gl.cmo
lablGL/glPix.cmo
lablGL/glTex.cmo
lablGL/glMisc.cmo
lablGL/glMat.cmo
lablGL/glFunc.cmo
lablGL/glDraw.cmo
lablGL/glClear.cmo
lablGL/glArray.cmo
link.o
./link.c: In function ‘ml_getfileannot’:
./link.c:2561:31: error: implicit declaration of function ‘pdf_embedded_file_name’ [-Werror=implicit-function-declaration]
 2561 |     ret_v = caml_copy_string (pdf_embedded_file_name (state.ctx, fs));
      |                               ^~~~~~~~~~~~~~~~~~~~~~
./link.c:2561:31: error: passing argument 1 of ‘caml_copy_string’ makes pointer from integer without a cast [-Werror=int-conversion]
 2561 |     ret_v = caml_copy_string (pdf_embedded_file_name (state.ctx, fs));
      |                               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                               |
      |                               int
In file included from ./link.c:37:
/usr/lib/ocaml/caml/alloc.h:39:36: note: expected ‘const char *’ but argument is of type ‘int’
   39 | CAMLextern value caml_copy_string (char const *);
      |                                    ^~~~~~~~~~~~
./link.c: In function ‘ml_savefileannot’:
./link.c:2579:26: error: implicit declaration of function ‘pdf_load_embedded_file’; did you mean ‘pdf_add_embedded_file’? [-Werror=implicit-function-declaration]
 2579 |         fz_buffer *buf = pdf_load_embedded_file (state.ctx, fs);
      |                          ^~~~~~~~~~~~~~~~~~~~~~
      |                          pdf_add_embedded_file
./link.c:2579:26: error: initialization of ‘fz_buffer *’ from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion]
cc1: all warnings being treated as errors
ocamlc -ccopt "-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security -fstack-clash-protection -fcf-protection -g -std=c11 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/sysprof-4 -pthread -I/usr/include/openjpeg-2.5 -Wall -Werror -Wextra -pedantic -O2 -D_POSIX_C_SOURCE -DGL_H='<GL/gl.h>' -DTEXT_TYPE=GL_TEXTURE_RECTANGLE_ARB -MMD -MF build/link.o.dep -MT_" -o build/link.o -c ./link.c failed
build failed
==> ERROR: A failure occurred in build().
    Aborting...