FreeBSD autogen failure

configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
*** WARNING: I am going to run 'configure' with no arguments.
*** If you wish to pass any to it, please specify them on the
*** './autogen.sh' command line.

configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
/usr/local/share/aclocal/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
autoreconf-2.69: Entering directory `.'
autoreconf-2.69: running: autopoint --force
autopoint: using AM_GNU_GETTEXT_REQUIRE_VERSION instead of AM_GNU_GETTEXT_VERSION
autoreconf-2.69: running: aclocal --force -I m4
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
autoreconf-2.69: configure.ac: tracing
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
autoreconf-2.69: running: libtoolize --copy --force
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: copying file 'm4/libtool.m4'
libtoolize: copying file 'm4/ltoptions.m4'
libtoolize: copying file 'm4/ltsugar.m4'
libtoolize: copying file 'm4/ltversion.m4'
libtoolize: copying file 'm4/lt~obsolete.m4'
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
autoreconf-2.69: running: /usr/local/bin/autoconf-2.69 --force
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
autoreconf-2.69: running: /usr/local/bin/autoheader-2.69 --force
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
autoreconf-2.69: running: automake --add-missing --copy --force-missing
configure.ac:354: warning: PKG_PROG_PKG_CONFIG is m4_require'd but not m4_defun'd
m4/gtk-doc.m4:32: GTK_DOC_CHECK is expanded from...
configure.ac:354: the top level
configure.ac:56: installing './compile'
configure.ac:36: installing './missing'
examples/Makefile.am: installing './depcomp'
autoreconf-2.69: Leaving directory `.'
checking build system type... amd64-unknown-freebsd13.0
checking host system type... amd64-unknown-freebsd13.0
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... ./install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... nawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether UID '1001' is supported by ustar format... yes
checking whether GID '1001' is supported by ustar format... yes
checking how to create a ustar tar archive... gnutar
checking whether make supports nested variables... (cached) yes
checking for gobject-introspection... ./configure: 3315: Syntax error: word unexpected (expecting ")")