diff --git a/build-packages.sh b/build-packages.sh
new file mode 100755
index 0000000..4f54f52
--- /dev/null
+++ b/build-packages.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+# SPDX-License-Identifier: MIT
+# Author: Nils Freydank <nils.freydank@posteo.de>
+PATH="/usr/bin:/bin:/usr/sbin:/sbin"
+set -uxa
+
+mapfile -t EMERGE_CALL_PARAMETERS <<<"${@}"
+
+REGISTRY="git.holgersson.xyz/gentoo-related/gentoo-binpkg-builder"
+VERSION="latest"
+IMAGE_TAG="${REGISTRY}:${VERSION}"
+
+REPOS="${REPOS:-/var/db/repos}"
+DISTFILES="${DISTFILES:-/var/cache/distfiles-podman-1}"
+BINPKG="${BINPKG:-/var/cache/packages-podman-1}"
+LOGDIR="${LOGDIR:-$(pwd)/logs}"
+PACKAGE_USE="${PACKAGE_USE:-$(pwd)/package.use}"
+
+podman_build_args=(
+    # Remove the container after usage.
+    --rm
+    # Allow interactive questsions by portage
+    -ti
+    # Limit the memory to be used.
+    --memory=20G
+    --memory-swap=1G
+    --shm-size=2G
+    # Share the portage configuration.
+    -v "${PACKAGE_USE}:/etc/portage/package.use:ro"
+    # Share the gentoo repo, overlays etc.
+    -v "${REPOS}:/var/db/repos:ro"
+    # Share the distfiles, i.e. typically source archives.
+    -v "${DISTFILES}:/var/cache/distfiles:rw,U"
+    # Share the binpkgs r/w cache.
+    -v "${BINPKG}:/var/cache/packages:rw,U"
+    # Keep the logs out of the container.
+    -v "${LOGDIR}:/var/log:rw,U"
+)
+
+mkdir -p "${REPOS}"
+mkdir -p "${DISTFILES}"
+mkdir -p "${BINPKG}"
+mkdir -p "${LOGDIR}"
+
+podman run "${podman_build_args[@]}" "${REGISTRY}:${VERSION}" \
+    emerge --oneshot --keep-going ${EMERGE_CALL_PARAMETERS[@]}
+
+# vim:fileencoding=utf-8:ts=4:syntax=bash:expandtab
diff --git a/package.use/acct-user:git-dep:gitea b/package.use/acct-user:git-dep:gitea
new file mode 100644
index 0000000..98bf306
--- /dev/null
+++ b/package.use/acct-user:git-dep:gitea
@@ -0,0 +1 @@
+acct-user/git gitea
diff --git a/package.use/app-admin:sudo b/package.use/app-admin:sudo
new file mode 100644
index 0000000..2852edd
--- /dev/null
+++ b/package.use/app-admin:sudo
@@ -0,0 +1 @@
+app-admin/sudo -ssl
diff --git a/package.use/net-misc:openssh b/package.use/net-misc:openssh
new file mode 100644
index 0000000..9ecc961
--- /dev/null
+++ b/package.use/net-misc:openssh
@@ -0,0 +1 @@
+net-misc/openssh -scp security-key
diff --git a/package.use/sys-devel:gcc b/package.use/sys-devel:gcc
new file mode 100644
index 0000000..23ccce6
--- /dev/null
+++ b/package.use/sys-devel:gcc
@@ -0,0 +1 @@
+sys-devel/gcc -jit -nls default-stack-clash-protection default-znow lto zstd
diff --git a/package.use/www-apps:gitea b/package.use/www-apps:gitea
new file mode 100644
index 0000000..6840709
--- /dev/null
+++ b/package.use/www-apps:gitea
@@ -0,0 +1 @@
+www-apps/gitea -filecaps