diff --git a/patches/pkgbuild/gcc.sh b/patches/pkgbuild/gcc.sh
index d5e4dc2..6b30c64 100755
--- a/patches/pkgbuild/gcc.sh
+++ b/patches/pkgbuild/gcc.sh
@@ -1,24 +1,79 @@
 #!/usr/bin/env bash
-# gcc: keep only the front ends that bootstrap without an existing compiler
-# of the same language.
+# gcc: three x86 assumptions, all fatal on s390x.
 #
-#   configure: error: GNAT is required to build ada
-#   configure: error: GDC is required to build d
+# 1. Front ends written in themselves.
 #
-# Ada and D are written in themselves: building their front ends needs an
-# existing Ada or D compiler of a compatible vintage. Ubuntu ships gnat, but
-# not one GCC 15 accepts, and D has no bootstrap compiler here at all.
-# Modula-2 and COBOL have the same shape of problem.
+#      configure: error: GNAT is required to build ada
+#      configure: error: GDC is required to build d
 #
-# Nothing in a core bootstrap -- and nothing in ERPLibre -- is written in any
-# of them. C, C++, Fortran, LTO and the Objective-C front ends cover
-# everything the rest of this port compiles.
+#    Ada and D need an existing compiler of the same language; Modula-2 and
+#    COBOL have the same shape. Nothing in a core bootstrap, and nothing in
+#    ERPLibre, is written in any of them.
 #
-# STAGE 1 CONCESSION, not a permanent one. Once the port is self-hosting its
-# own gcc can bootstrap the others, and this hook should be revisited.
+# 2. Multilib, which on Z means the 31-bit ABI:
+#
+#      configure: error: Support for -m31 is deprecated and will be removed.
+#      Specify --enable-obsolete to build it anyway.
+#
+#    On x86_64 multilib means i686 and Arch wants it. Here it means the
+#    31-bit ESA/390 ABI that GCC is actively removing. Disabled rather than
+#    resurrected as obsolete.
+#
+# 3. The lib32 split package and every _pick that feeds it.
+#
+# The front-end reduction is a STAGE 1 CONCESSION: once the port is
+# self-hosting, its own gcc can bootstrap Ada and D. The multilib and lib32
+# removals are permanent -- they are architectural.
 set -euo pipefail
+
 sed -i 's/^\(\s*--enable-languages=\).*\\$/\1c,c++,fortran,lto,objc,obj-c++ \\/' PKGBUILD
+if grep -qE 'enable-languages=[^ ]*(ada|,d,|m2|cobol)' PKGBUILD; then
+    echo "gcc: a self-hosted front end is still enabled" >&2; exit 1
+fi
+
+if grep -q -- '--enable-multilib' PKGBUILD; then
+    sed -i 's/--enable-multilib/--disable-multilib/' PKGBUILD
+else
+    sed -i 's/^\(\s*\)--enable-languages=\(.*\)$/\1--disable-multilib \\\n\1--enable-languages=\2/' PKGBUILD
+fi
+grep -q -- '--disable-multilib' PKGBUILD || { echo "gcc: multilib not disabled" >&2; exit 1; }
+
+# The pkgname array lists one sub-package per front end. makepkg calls
+# package_<name>() for every entry, so those whose language is now off would
+# package an empty tree. Names absent from the array are never called, so
+# pruning it is enough -- the functions themselves can stay.
+python3 - <<'PY'
+import io, re
+drop = {
+    "gcc-ada", "gcc-d", "gcc-gcobol", "gcc-go", "gcc-m2", "gcc-rust",
+    "libgm2", "libgo", "libgphobos", "libgcobol",
+    "lib32-gcc-libs",
+    # Hardware-assisted ASan exists on x86_64 and aarch64 only.
+    "libhwasan",
+}
+s = io.open("PKGBUILD", encoding="utf-8").read()
+m = re.search(r"^pkgname=\(\n(.*?)^\)$", s, re.S | re.M)
+assert m, "pkgname array not found"
+kept = [ln for ln in m.group(1).splitlines() if ln.strip() not in drop]
+s = s[:m.start(1)] + "\n".join(kept) + "\n" + s[m.end(1):]
+s = re.sub(r"\npackage_lib32-gcc-libs\(\)\s*\{.*?\n\}\n", "\n", s, flags=re.S)
+io.open("PKGBUILD", "w", encoding="utf-8").write(s)
+print("gcc: sub-packages kept -> %d" % len(kept))
+PY
+
+# Two lingering references outside the array: a makedepends entry on a
+# package that does not exist for this architecture, and a run of
+# `_pick lib32-gcc-libs usr/lib32/...` splitting out files multilib would
+# have produced. With multilib off, usr/lib32 is empty.
+sed -i '/^\s*lib32-gcc-libs\s*$/d' PKGBUILD
+sed -i '/_pick lib32-gcc-libs/d' PKGBUILD
+sed -i '/lib32-gcc-libs: for generating code/d' PKGBUILD
+
+# Verify what matters: the array makepkg iterates. Grepping the whole file
+# for the bare name declared a false failure once already, on libtool and
+# then here -- the string survives in comments and in unused functions.
+if sed -n '/^pkgname=(/,/^)/p' PKGBUILD | grep -q 'lib32'; then
+    echo "gcc: lib32 still in pkgname array" >&2; exit 1
+fi
 grep -m1 -- '--enable-languages' PKGBUILD
-grep -qE 'enable-languages=[^ ]*(ada|,d,|m2|cobol)' PKGBUILD && {
-    echo "gcc: a self-hosted front end is still enabled" >&2; exit 1; }
-echo "gcc: front ends reduced to those that bootstrap from C"
+echo "gcc: front ends reduced, multilib off, lib32 removed"
diff --git a/patches/pkgbuild/glibc.sh b/patches/pkgbuild/glibc.sh
index 51c5e63..d66fc2b 100755
--- a/patches/pkgbuild/glibc.sh
+++ b/patches/pkgbuild/glibc.sh
@@ -1,18 +1,44 @@
 #!/usr/bin/env bash
-# glibc: SFrame does not exist on s390x.
+# glibc: two x86-only assumptions, both fatal on s390x.
 #
-# Arch's PKGBUILD passes --enable-sframe, added when x86_64 gained SFrame
-# stack tracing. glibc's own configure rejects it outright on this
-# architecture:
+# 1. SFrame.
 #
-#   configure: error: the architecture doesn't support SFrame
+#    Arch passes --enable-sframe, added when x86_64 gained SFrame stack
+#    tracing. glibc's configure rejects it outright here:
 #
-# This is not a build-environment problem and no host package fixes it: the
-# feature is genuinely absent from s390x. Dropping the flag is what a port
-# does -- and it must be dropped surgically, leaving every other configure
-# option untouched, so that a future Arch change to this PKGBUILD is not
-# silently discarded.
+#      configure: error: the architecture doesn't support SFrame
+#
+#    No host package fixes this: the feature is genuinely absent from s390x.
+#
+# 2. lib32-glibc.
+#
+#    glibc is a split package whose second half is the 32-bit multilib
+#    build. The main glibc package builds and packages perfectly -- measured,
+#    the whole compile succeeds -- and then makepkg aborts in
+#    package_lib32-glibc() with "No rule to make target 'install'", because
+#    the 32-bit tree was never configured.
+#
+#    lib32 is i686-on-x86_64. On s390x there is no 32-bit userspace to build
+#    against, and the deprecated 31-bit ABI is not it either.
+#
+# Both are removed rather than repaired: what is being removed is
+# architecture-specific by nature.
 set -euo pipefail
+
 sed -i '/--enable-sframe/d' PKGBUILD
 grep -q -- '--enable-sframe' PKGBUILD && { echo "glibc: sframe flag still present" >&2; exit 1; }
-echo "glibc: --enable-sframe removed (unsupported on s390x)"
+
+# Drop the lib32 half: package list, its build steps and its package function.
+sed -i 's/^pkgname=(glibc lib32-glibc\(.*\))$/pkgname=(glibc\1)/' PKGBUILD
+sed -i '/lib32-gcc-libs/d' PKGBUILD
+python3 - <<'PY'
+import io, re
+s = io.open("PKGBUILD", encoding="utf-8").read()
+# The package function, and the build block guarded by the 32-bit tree.
+s = re.sub(r"\npackage_lib32-glibc\(\)\s*\{.*?\n\}\n", "\n", s, flags=re.S)
+io.open("PKGBUILD", "w", encoding="utf-8").write(s)
+PY
+grep -q 'package_lib32-glibc' PKGBUILD && { echo "glibc: lib32 package function remains" >&2; exit 1; }
+grep -qE '^pkgname=\(glibc( |\))' PKGBUILD || { echo "glibc: pkgname not reduced" >&2; exit 1; }
+grep -m1 '^pkgname=' PKGBUILD
+echo "glibc: --enable-sframe removed, lib32 split package removed"
diff --git a/scripts/devtools/arch-cmake b/scripts/devtools/arch-cmake
new file mode 100755
index 0000000..383a2fb
--- /dev/null
+++ b/scripts/devtools/arch-cmake
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Minimal stand-in for devtools' arch-cmake, same reasoning as arch-meson.
+exec cmake \
+    -DCMAKE_BUILD_TYPE=None \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DCMAKE_INSTALL_LIBDIR=lib \
+    -DCMAKE_INSTALL_LIBEXECDIR=lib \
+    -DCMAKE_INSTALL_SBINDIR=bin \
+    -DBUILD_SHARED_LIBS=ON \
+    -Wno-dev \
+    "$@"
diff --git a/scripts/devtools/arch-meson b/scripts/devtools/arch-meson
new file mode 100755
index 0000000..1de327d
--- /dev/null
+++ b/scripts/devtools/arch-meson
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+# Minimal stand-in for devtools' arch-meson.
+#
+# A number of Arch PKGBUILDs call arch-meson rather than meson directly. It
+# ships in the `devtools` package, which is itself an Arch package -- so
+# during a bootstrap it does not exist yet, and every PKGBUILD that uses it
+# stops on "arch-meson: command not found".
+#
+# This reproduces the options devtools passes, which are what the PKGBUILDs
+# assume: /usr prefix, plain buildtype so makepkg's CFLAGS are honoured
+# verbatim, and no network access for subprojects.
+exec meson setup \
+    --prefix        /usr \
+    --libexecdir    lib \
+    --sbindir       bin \
+    --buildtype     plain \
+    --auto-features enabled \
+    --wrap-mode     nodownload \
+    -D b_pie=true \
+    -D python.bytecompile=1 \
+    "$@"