diff --git a/generate.py b/generate.py
index 69f4f5e..7f9eede 100644
--- a/generate.py
+++ b/generate.py
@@ -19,6 +19,38 @@ HEADER = """# GENERATED by oleks/ci-scripts — do not hand-edit.
 """
 
 
+def is_no_build(repo: dict) -> bool:
+    """s390x = no-build: s390x hardware is currently unavailable, so those
+    wheels are not built/published (the repo code is kept as a cross-compile
+    reference only). Any manifest entry may opt in/out with an explicit
+    `no_build:` flag; otherwise entries under `s390x/` default to no-build.
+    See the ci-scripts wiki Spec/* pages and memory feedback-no-s390x-builds."""
+    return repo.get("no_build", str(repo.get("dir", "")).startswith("s390x/"))
+
+
+def render_no_build(repo: dict) -> str:
+    """Render a neutralized pipeline that does NOT build. Uses `event: manual`
+    so tag pushes never auto-trigger a build; a manual run just prints why."""
+    arch = repo.get("arch", "amd64")
+    return f"""{HEADER}# s390x = NO-BUILD: s390x hardware is currently unavailable, so this wheel is
+# not built or published — the repo is kept as a cross-compile reference only.
+# Re-enable by setting `no_build: false` on this repo in manifest.yaml.
+labels:
+  arch: {arch}
+
+when:
+  - event: manual
+
+steps:
+  - name: build-disabled
+    image: alpine:3
+    commands:
+      - echo "s390x build disabled — hardware currently unavailable."
+      - echo "Repo kept as a cross-compile reference only; not built/published."
+      - echo "See oleks/ci-scripts wiki Spec/* and memory feedback-no-s390x-builds."
+"""
+
+
 def render(repo: dict) -> str:
     arch = repo["arch"]
     mem_req = repo["memory_request"]
@@ -246,7 +278,7 @@ def main():
     ]
     for repo, render_fn in jobs:
         target = BUILDING / repo["dir"] / ".woodpecker.yaml"
-        rendered = render_fn(repo)
+        rendered = render_no_build(repo) if is_no_build(repo) else render_fn(repo)
         if check_only:
             current = target.read_text() if target.exists() else ""
             if current != rendered:
diff --git a/manifest.yaml b/manifest.yaml
index e518db6..63f56e5 100644
--- a/manifest.yaml
+++ b/manifest.yaml
@@ -22,9 +22,18 @@
 #   cores          - Nix `cores` setting written into /etc/nix/nix.conf
 #   max_jobs       - whether to also cap `max-jobs = 1` (small/serial builds)
 #   attic          - whether to run the inline `attic watch-store` accelerator
+#   no_build        - if true, render a NEUTRALIZED pipeline (event: manual, no
+#                     build/publish). s390x = no-build: s390x hardware is
+#                     currently UNAVAILABLE, so those wheels are not built —
+#                     the repo code is kept as a cross-compile reference only.
+#                     Entries under s390x/ default to no_build even without the
+#                     flag (generate.py is_no_build). Re-enable by setting
+#                     no_build: false. arm64 builds are unaffected (arm64 hw is
+#                     available). See wiki Spec/* + memory feedback-no-s390x-builds.
 
 repos:
   - dir: s390x/lxml-s390x
+    no_build: true
     arch: amd64
     memory_request: 2Gi
     memory_limit: 6Gi
@@ -32,6 +41,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/pillow-s390x
+    no_build: true
     arch: amd64
     memory_request: 6Gi
     memory_limit: 6Gi
@@ -39,6 +49,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/psycopg-s390x
+    no_build: true
     arch: amd64
     memory_request: 6Gi
     memory_limit: 6Gi
@@ -46,6 +57,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/psycopg2-binary-s390x
+    no_build: true
     arch: amd64
     memory_request: 6Gi
     memory_limit: 6Gi
@@ -53,6 +65,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/tiktoken-s390x
+    no_build: true
     arch: amd64
     memory_request: 6Gi
     memory_limit: 6Gi
@@ -61,6 +74,7 @@ repos:
     attic: true
     redis_cache: true
   - dir: s390x/duckdb-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi
@@ -68,6 +82,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/faiss-cpu-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi
@@ -75,6 +90,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/numpy-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi
@@ -82,6 +98,7 @@ repos:
     max_jobs: true
     attic: true
   - dir: s390x/pymupdf-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 50Gi
@@ -89,6 +106,7 @@ repos:
     max_jobs: false
     attic: true
   - dir: s390x/markupsafe-s390x
+    no_build: true
     arch: amd64
     memory_request: 2Gi
     memory_limit: 6Gi
@@ -126,6 +144,7 @@ repos:
 #     bespoke hand-maintained file; flagged alongside fastuuid.
 thin_repos:
   - dir: s390x/asyncpg-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi
@@ -136,6 +155,7 @@ thin_repos:
     dead_secrets: []
     gitea_clone_token: false
   - dir: s390x/cryptography-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi
@@ -147,6 +167,7 @@ thin_repos:
     tags_full: false
     dead_secrets: [attic_token, redis_password]
   - dir: s390x/lightningcss-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi
@@ -156,6 +177,7 @@ thin_repos:
     tags_full: true
     dead_secrets: [attic_token, redis_password]
   - dir: s390x/nextjs-swc-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 50Gi
@@ -165,6 +187,7 @@ thin_repos:
     tags_full: true
     dead_secrets: [attic_token, redis_password]
   - dir: s390x/rollup-s390x
+    no_build: true
     arch: amd64
     memory_request: 8Gi
     memory_limit: 32Gi