diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ac9fcc7a7..95342c493 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -108,10 +108,16 @@ variables:
 
 .build-gobject-introspection:
   before_script:
-    - mkdir -p gobject-introspection
-    - git clone --branch $GOBJECT_INTROSPECTION_TAG https://gitlab.gnome.org/GNOME/gobject-introspection.git gobject-introspection
-    - meson gobject-introspection gobject-introspection/build --prefix=/usr
-    - sudo meson install -C gobject-introspection/build
+    # If the CI image doesn’t provide a new enough gobject-introspection
+    # package, build it ourselves.
+    # See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3746#note_2161354
+    - >
+      if ! pkg-config --atleast-version "${GOBJECT_INTROSPECTION_TAG}" gobject-introspection-1.0; then
+        mkdir -p gobject-introspection
+        git clone --branch $GOBJECT_INTROSPECTION_TAG https://gitlab.gnome.org/GNOME/gobject-introspection.git gobject-introspection
+        meson gobject-introspection gobject-introspection/build --prefix=/usr
+        sudo meson install -C gobject-introspection/build
+      fi
   artifacts:
     expire_in: 3 days
     paths:
diff --git a/.gitlab-ci/test-msys2.sh b/.gitlab-ci/test-msys2.sh
index 3a58f0bb7..29c103a4f 100755
--- a/.gitlab-ci/test-msys2.sh
+++ b/.gitlab-ci/test-msys2.sh
@@ -34,10 +34,15 @@ PATH="$(cygpath "$USERPROFILE")/.local/bin:$HOME/.local/bin:$PATH"
 DIR="$(pwd)"
 export PATH CFLAGS
 
-mkdir -p gobject-introspection
-git clone --branch "${GOBJECT_INTROSPECTION_TAG}" https://gitlab.gnome.org/GNOME/gobject-introspection.git gobject-introspection
-meson gobject-introspection gobject-introspection/build --prefix "/c/msys64/${MSYSTEM}/usr"
-meson install -C gobject-introspection/build
+# If msys2 doesn’t provide a new enough gobject-introspection package, build it
+# ourselves.
+# See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3746#note_2161354
+if [[ $(vercmp "$(pacman -Qi "${MINGW_PACKAGE_PREFIX}"-gobject-introspection | grep -Po '^Version\s*: \K.+')" "${GOBJECT_INTROSPECTION_TAG}") -lt 0 ]]; then
+    mkdir -p gobject-introspection
+    git clone --branch "${GOBJECT_INTROSPECTION_TAG}" https://gitlab.gnome.org/GNOME/gobject-introspection.git gobject-introspection
+    meson gobject-introspection gobject-introspection/build --prefix "/c/msys64/${MSYSTEM}/usr"
+    meson install -C gobject-introspection/build
+fi
 
 # FIXME: We can’t use ${MESON_COMMON_OPTIONS} here because this script installs
 # Meson 1.3. See the comment in .gitlab-ci.yml about the same problem on
diff --git a/glib/gpoll.c b/glib/gpoll.c
index 4ec0bfdd3..cbbbe8886 100644
--- a/glib/gpoll.c
+++ b/glib/gpoll.c
@@ -449,7 +449,6 @@ g_poll (GPollFD *fds,
   for (i = 0; i < nthreads; i++)
     {
       guint thread_fds;
-      guint ignore;
 
       if (i == (nthreads - 1) && threads_remain > 0)
         thread_fds = threads_remain;
diff --git a/glib/gvariant-core.c b/glib/gvariant-core.c
index a8de6689c..7afef1b2f 100644
--- a/glib/gvariant-core.c
+++ b/glib/gvariant-core.c
@@ -76,7 +76,11 @@ struct _GVariant
   gatomicrefcount ref_count;
   gsize depth;
 
+#if g_macro__has_attribute(aligned)
+  guint8 suffix[] __attribute__((aligned(8)));
+#else
   guint8 suffix[];
+#endif
 };
 
 /* Ensure our suffix data aligns to largest guaranteed offset