diff --git a/pmb/build/_package.py b/pmb/build/_package.py
index 29044274..4fdf1a40 100644
--- a/pmb/build/_package.py
+++ b/pmb/build/_package.py
@@ -314,11 +314,15 @@ def run_abuild(context: Context, apkbuild, channel, arch: Arch, strict=False, fo
         cmd += ["-f"]
 
     # Copy the aport to the chroot and build it
-    pmb.build.copy_to_buildpath(apkbuild["pkgname"], suffix)
+    pmb.build.copy_to_buildpath(apkbuild["pkgname"], suffix, no_override=strict)
     override_source(apkbuild, apkbuild["pkgver"], src, suffix)
     link_to_git_dir(suffix)
     pmb.chroot.user(cmd, suffix, Path("/home/pmos/build"), env=env)
 
+    if (suffix / "tmp/apkbuild_verify_failed").exists():
+        logging.info("WARNING: Some checksums didn't match, run"
+                    f" 'pmbootstrap checksum {apkbuild['pkgname']}' to fix them.")
+
 
 def finish(apkbuild, channel, arch, output: Path, chroot: Chroot, strict=False):
     """Various finishing tasks that need to be done after a build."""
diff --git a/pmb/build/checksum.py b/pmb/build/checksum.py
index 3c3c1883..14d29eae 100644
--- a/pmb/build/checksum.py
+++ b/pmb/build/checksum.py
@@ -15,7 +15,7 @@ from pmb.core import Chroot
 def update(pkgname):
     """Fetch all sources and update the checksums in the APKBUILD."""
     pmb.build.init_abuild_minimal()
-    pmb.build.copy_to_buildpath(pkgname)
+    pmb.build.copy_to_buildpath(pkgname, no_override=True)
     logging.info("(native) generate checksums for " + pkgname)
     pmb.chroot.user(["abuild", "checksum"],
                     working_dir=Path("/home/pmos/build"))
diff --git a/pmb/build/other.py b/pmb/build/other.py
index 05946b67..85931e17 100644
--- a/pmb/build/other.py
+++ b/pmb/build/other.py
@@ -21,7 +21,7 @@ from pmb.core import Chroot
 from pmb.core.context import get_context
 
 
-def copy_to_buildpath(package, chroot: Chroot=Chroot.native()):
+def copy_to_buildpath(package, chroot: Chroot=Chroot.native(), no_override: bool=False):
     # Sanity check
     aport = pmb.helpers.pmaports.find(package)
     if not os.path.exists(aport / "APKBUILD"):
@@ -44,9 +44,24 @@ def copy_to_buildpath(package, chroot: Chroot=Chroot.native()):
             continue
         pmb.helpers.run.root(["cp", "-rL", aport / file, build / file])
 
+    if not no_override:
+        abuild_overrides(build / "APKBUILD")
+
     pmb.chroot.root(["chown", "-R", "pmos:pmos",
                            "/home/pmos/build"], chroot)
 
+
+def abuild_overrides(apkbuild: Path):
+    """Override some abuild functions by patching the APKBUILD file."""
+
+    if apkbuild.is_relative_to(get_context().config.work / "cache_git"):
+        raise ValueError(f"Refusing to patch file in pmaports repo: {apkbuild}")
+
+    # Patch the APKBUILD file
+    override_path = pmb.config.pmb_src / "pmb/data/abuild_overrides.sh"
+    pmb.helpers.run.root(["sh", "-c", f"cat {override_path} >> {apkbuild}"])
+
+
 class BuildStatus(enum.StrEnum):
     # The binary package is outdated
     OUTDATED = "outdated"
diff --git a/pmb/data/abuild_overrides.sh b/pmb/data/abuild_overrides.sh
new file mode 100644
index 00000000..d639df38
--- /dev/null
+++ b/pmb/data/abuild_overrides.sh
@@ -0,0 +1,17 @@
+# shellcheck shell=sh
+# BEGIN PMBOOTSTRAP OVERRIDES
+
+# Patched version of verify() to only warn instead of
+# refusing to build.
+# shellcheck disable=SC2034,SC2154,SC3043
+verify() {
+	rm -f /tmp/apkbuild_verify_failed
+	local verified=false algo=
+	sumcheck "sha512" "$sha512sums" && verified=true
+	if [ -n "$source" ] && ! $verified; then
+		touch /tmp/apkbuild_verify_failed
+	fi
+	return 0
+}
+
+# END PMBOOTSTRAP OVERRIDES