gstreamer plain build with auto features enabled fails on gobject-instrospection even if introspection is disabled

Since the bump of glib to 2.74.1, some mechanism in the build system concludes that the subproject gobject-introspection is buildable and that it should be built. Then later when running g-ir-scanner as part of gobject-introspection the build fails because of an include path problem. Adding option -Dintrospection=disabled does not help. An easy workaround to the problem is to install gobject-instrospection from the distro and the build system will not try use the subproject fallback.

The problem is easily reproducible by running a plain gstreamer build within a docker container from the image set up by the Dockerfile below:

FROM ubuntu:22.04

RUN apt-get update -y && \
  DEBIAN_FRONTEND=noninteractive apt-get install -y \
#  gobject-introspection \
#  libgirepository1.0-dev \
  pkg-config \
  build-essential \
  cmake \
  python3 \
  python3-pip  \
  python3-setuptools \
  python3-wheel \
  ninja-build \
  autoconf \
  libtool \
  gcc \
  git \
  g++ \
  flex \
  bison

# gives us meson 0.64.1
RUN pip3 install meson

Executing the lines below from within the container creates a build that fails:

# main is 66087b62766d0fb1362baab494930144d5985305 at the time of writing
git clone https://gitlab.freedesktop.org/gstreamer/gstreamer.git
( cd gstreamer && meson setup -Dintrospection=disabled ../build )
ninja -C build

Error output below:

In file included from /build/g-ir-cpp-qxwustf9.c:4:
/gstreamer/subprojects/glib-2.74.1/gobject/glib-types.h:26:10: fatal error: glib.h: No such file or directory
   26 | #include <glib.h>
      |          ^~~~~~~~
compilation terminated.

Uncommenting the commented lines in the dockerfile is a workaround for the issue.