diff --git a/.dockerignore b/.dockerignore
index 3b2df1bb..110a7f3e 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,3 +1,4 @@
 *
+!Cargo.*
 !gui/Cargo.*
 !contrib/docker/cargo_config.toml
diff --git a/contrib/docker/README.md b/contrib/docker/README.md
new file mode 100644
index 00000000..f046b340
--- /dev/null
+++ b/contrib/docker/README.md
@@ -0,0 +1,33 @@
+## Reproducible Liana builds
+
+This repository contains the scripts to [reproducibly build](https://reproducible-builds.org/) Liana
+on Windows and MacOS, for which we are missing [bootstrapable Guix builds](../guix/).
+
+In order to perform the builds you will need [Docker](https://www.docker.com/).
+
+The [`docker-build.sh`](./docker-build.sh) script will create a Docker image containing the build
+environment for both Mac and Windows (see the respective `Dockerfile`s). It will then build the GUI
+on Windows (the daemon isn't supported there) and both the daemon and the GUI on MacOS. The output
+will be placed in a given `TARGET_DIR` (whose default value is `deter_build_target`).
+
+### Build instructions
+
+First of all, get [Docker](https://www.docker.com/).
+
+Then get the MacOS SDK. It is required to be able to build the MacOS binaries. The `12_2` version is
+required (`Xcode_12.2.xip`). You need to download it from Apple's website. An Apple ID and cookies
+enabled for the hostname are required.  You can create one for free. (Note it is illegal to
+distribute the archive.) Once logged in you can use the [direct
+link](https://download.developer.apple.com/Developer_Tools/Xcode_12.2/Xcode_12.2.xip) to download
+the archive. Alternatively, go to 'Downloads', then 'More' and search for [`Xcode
+12.2`](https://developer.apple.com/download/all/?q=Xcode%2012.2).
+The `sha256sum` of the downloaded XIP archive should be
+`28d352f8c14a43d9b8a082ac6338dc173cb153f964c6e8fb6ba389e5be528bd0`.
+
+Copy the downloaded `Xcode_12.2.xip` archive at the root of this repository (or provide a custom
+path to the script by setting the `XCODE_PATH` env var).
+
+Finally, run the script from the root of the repository:
+```
+./contrib/docker/docker-build.sh
+```
diff --git a/contrib/docker/docker-build.sh b/contrib/docker/docker-build.sh
index b687f6a2..5905f132 100755
--- a/contrib/docker/docker-build.sh
+++ b/contrib/docker/docker-build.sh
@@ -2,14 +2,35 @@
 
 set -ex
 
-TARGET_DIR="$PWD/deter_build_target"
+TARGET_DIR="${TARGET_DIR:-"$PWD/deter_build_target"}"
 
-docker build . -t liana_cross_compile -f contrib/docker/Dockerfile
+XCODE_PATH="${XCODE_PATH:-"$PWD/Xcode_12.2.xip"}"
+
+# Build (only) the Liana GUI on Windows.
+docker build . -t liana_cross_win -f contrib/docker/windows.Dockerfile
 docker run --rm -ti \
-    -v "$TARGET_DIR":/liana/target \
+    -v "$TARGET_DIR/gui":/liana/target \
     -v "$PWD/contrib/docker":/liana/docker \
     -v "$PWD/gui/src":/liana/src \
     -v "$PWD/gui/static":/liana/static \
-    liana_cross_compile
+    liana_cross_win
+
+# Sanity check the given MacOS SDK is the expected one.
+if ! $(echo "28d352f8c14a43d9b8a082ac6338dc173cb153f964c6e8fb6ba389e5be528bd0 $(basename $XCODE_PATH)" | sha256sum -c --status); then
+    echo "No or invalid Xcode SDK found. Need an Xcode_12.2.xip. You can configure the path using \$XCODE_PATH.";
+    exit 1;
+fi
+
+# Build both the Liana daemon and GUI on MacOS.
+docker build . -t liana_cross_mac -f contrib/docker/macos.Dockerfile
+docker run --rm -ti \
+    -v "$TARGET_DIR":/liana/target \
+    -v "$TARGET_DIR/gui":/liana/gui/target \
+    -v "$PWD/contrib/docker":/liana/docker \
+    -v "$PWD/src":/liana/src \
+    -v "$PWD/gui/src":/liana/gui/src \
+    -v "$PWD/gui/static":/liana/gui/static \
+    -v "$XCODE_PATH":/liana/Xcode_12.2.xip \
+    liana_cross_mac
 
 set +ex
diff --git a/contrib/docker/macos.Dockerfile b/contrib/docker/macos.Dockerfile
new file mode 100644
index 00000000..e0eff2dd
--- /dev/null
+++ b/contrib/docker/macos.Dockerfile
@@ -0,0 +1,63 @@
+FROM debian:bullseye
+
+WORKDIR /liana
+
+# We try to pin our dependencies to avoid potential sources of non-determinism, but we don't go
+# out of our way to pin the whole tree of deps. Instead invest time in getting Guix cross-compilation.
+RUN apt update && apt install -y \
+                    clang=1:11.0-51+nmu5 \
+                    make=4.3-4.1 \
+                    libssl-dev=1.1.1n-0+deb11u3 \
+                    liblzma-dev=5.2.5-2.1~deb11u1 \
+                    libxml2=2.9.10+dfsg-6.7+deb11u2 \
+                    libxml2-dev=2.9.10+dfsg-6.7+deb11u2 \
+                    cmake=3.18.4-2+deb11u1 \
+                    git=1:2.30.2-1 \
+                    patch=2.7.6-7 \
+                    python3=3.9.2-3 \
+                    llvm-dev=1:11.0-51+nmu5 \
+                    cpio=2.13+dfsg-4 \
+                    zlib1g-dev=1:1.2.11.dfsg-2+deb11u2 \
+                    libbz2-dev=1.0.8-4 \
+                    xz-utils=5.2.5-2.1~deb11u1 \
+                    bzip2=1.0.8-4 \
+                    curl=7.74.0-1.3+deb11u3
+
+# Download the cargo binary and compiled stdlib from the distributed releases to make sure to build with
+# the very same toolchain. We use 1.65.0 because it is unfortunately the MSRV of the GUI.
+RUN curl -O "https://static.rust-lang.org/dist/rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz" && \
+    echo "8f754fdd5af783fe9020978c64e414cb45f3ad0a6f44d045219bbf2210ca3cb9 rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz" | sha256sum -c && \
+    tar -xzf rust-1.65.0-x86_64-unknown-linux-gnu.tar.gz && \
+    curl -O "https://static.rust-lang.org/dist/rust-1.65.0-x86_64-apple-darwin.tar.gz" && \
+    echo "139087a3937799415fd829e5a88162a69a32c23725a44457f9c96b98e4d64a7c rust-1.65.0-x86_64-apple-darwin.tar.gz" | sha256sum -c  && \
+    tar -xzf rust-1.65.0-x86_64-apple-darwin.tar.gz && \
+    rm -r *.tar.gz
+
+# Copy the Cargo files for both the daemon and the GUI to vendor the dependencies.
+COPY Cargo.toml Cargo.lock /liana/
+COPY gui/Cargo.toml gui/Cargo.lock /liana/gui/
+
+# We cache the dependencies sources in the image to avoid re-indexing everything from scratch
+# at every run. It was useful when debugging the build, it could be removed eventually if we
+# think the tradeoff vs the image size isn't worth it anymore.
+RUN /liana/rust-1.65.0-x86_64-unknown-linux-gnu/cargo/bin/cargo vendor && \
+    cd gui && \
+    /liana/rust-1.65.0-x86_64-unknown-linux-gnu/cargo/bin/cargo vendor && \
+    cd ..
+
+# Cargo configuration for using the vendored dependencies during the builds.
+COPY contrib/docker/cargo_config.toml /liana/.cargo/cargo_config.toml
+COPY contrib/docker/cargo_config.toml /liana/gui/.cargo/cargo_config.toml
+
+# For some reason, we can't just set the RUSTFLAGS environment variable to add `-L` for compiling dependencies.
+# This doesn't work: RUSTFLAGS="-L/liana/rust-1.65.0-x86_64-apple-darwin/rust-std-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/"
+# As a workaround, we use a wrapped `rustc` binary that always links against the macOS stdlib we just downloaded.
+# Some issues that seem to be related:
+# https://github.com/rust-lang/rust/issues/40717
+# https://github.com/rust-lang/rust/issues/48409
+RUN echo "#!/bin/sh" > rustc_wrapper.sh && \
+    echo "/liana/rust-1.65.0-x86_64-unknown-linux-gnu/rustc/bin/rustc \"\$@\" -L/liana/rust-1.65.0-x86_64-apple-darwin/rust-std-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/ -L/liana/rust-1.65.0-x86_64-unknown-linux-gnu/rust-std-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/" >> rustc_wrapper.sh && \
+    chmod +x rustc_wrapper.sh
+ENV RUSTC="/liana/rustc_wrapper.sh"
+
+CMD ["./docker/macos_cmd.sh"]
diff --git a/contrib/docker/macos_cmd.sh b/contrib/docker/macos_cmd.sh
new file mode 100755
index 00000000..d5935a11
--- /dev/null
+++ b/contrib/docker/macos_cmd.sh
@@ -0,0 +1,51 @@
+#!/usr/bin/env sh
+
+# ==========================================================
+# The script ran within the Docker container to build Liana.
+# ==========================================================
+
+set -xe
+
+# Build the SDK and the toolchain using osxcross. It is expected to be located at /liana/Xcode_12.2.xip.
+# It's not part of the image to be able to share the Xcode_12.2.xip instead of copying it in the Docker context
+# and then to the image.
+git clone https://github.com/darosior/osxcross -b dependencies_pinning
+cd osxcross
+git checkout 50e86ebca7d14372febd0af8cd098705049161b9
+DARLING_DMG_REVISION=241238313a47d3cf6427ac5a75b7a0311a3a4cb4 \
+    P7ZIP_REVISION=2f60a51ac3aa2507d36df3c4f58f71a3716b1357 \
+    PBZX_REVISION=2a4d7c3300c826d918def713a24d25c237c8ed53 \
+    XAR_REVISION=c2111a9a9cabc50d2b9c604aff41a481ae3f1989 ./tools/gen_sdk_package_pbzx.sh ../Xcode_12.2.xip
+mv MacOSX11.0.sdk.tar.xz tarballs/
+DARLING_DMG_REVISION=241238313a47d3cf6427ac5a75b7a0311a3a4cb4 \
+    P7ZIP_REVISION=2f60a51ac3aa2507d36df3c4f58f71a3716b1357 \
+    PBZX_REVISION=2a4d7c3300c826d918def713a24d25c237c8ed53 \
+    XAR_REVISION=c2111a9a9cabc50d2b9c604aff41a481ae3f1989 \
+    UNATTENDED=1 ./build.sh
+cd ..
+
+# Finally build the projects using the toolchain just created.
+alias cargo="/liana/rust-1.65.0-x86_64-unknown-linux-gnu/cargo/bin/cargo"
+
+PATH="$PATH:$PWD/osxcross/target/bin/" \
+    CC=o64-clang \
+    CXX=o64-clang++ \
+    RUSTFLAGS="$RUSTFLAGS -Clinker=o64-clang" \
+    cargo rustc \
+        --target x86_64-apple-darwin \
+        --release
+
+cd gui/
+PATH="$PATH:$PWD/../osxcross/target/bin/" \
+    CC=o64-clang \
+    CXX=o64-clang++ \
+    RUSTFLAGS="$RUSTFLAGS -Clinker=o64-clang" \
+    cargo rustc \
+        --target x86_64-apple-darwin \
+        --release
+cd ..
+
+# Avoid having to get root on the host to remove the target dir.
+chmod -R a+rw target/ gui/target
+
+set +xe
diff --git a/contrib/docker/Dockerfile b/contrib/docker/windows.Dockerfile
similarity index 96%
rename from contrib/docker/Dockerfile
rename to contrib/docker/windows.Dockerfile
index ba3a41f1..057e596d 100644
--- a/contrib/docker/Dockerfile
+++ b/contrib/docker/windows.Dockerfile
@@ -38,9 +38,7 @@ COPY contrib/docker/cargo_config.toml /liana/.cargo/cargo_config.toml
 # https://github.com/rust-lang/rust/issues/48409
 RUN echo "#!/bin/sh" > rustc_wrapper.sh && \
     echo "/liana/rust-1.65.0-x86_64-unknown-linux-gnu/rustc/bin/rustc \"\$@\" -L /liana/rust-1.65.0-x86_64-pc-windows-gnu/rust-std-x86_64-pc-windows-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/ -L /liana/rust-1.65.0-x86_64-unknown-linux-gnu/rust-std-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/" >> rustc_wrapper.sh && \
-    chmod +x rustc_wrapper.sh && \
-    cat rustc_wrapper.sh && \
-    ./rustc_wrapper.sh -vV
+    chmod +x rustc_wrapper.sh
 ENV RUSTC="/liana/rustc_wrapper.sh"
 
-CMD ["./docker/build.sh"]
+CMD ["./docker/windows_cmd.sh"]
diff --git a/contrib/docker/build.sh b/contrib/docker/windows_cmd.sh
similarity index 66%
rename from contrib/docker/build.sh
rename to contrib/docker/windows_cmd.sh
index 40a88dfa..414a3352 100755
--- a/contrib/docker/build.sh
+++ b/contrib/docker/windows_cmd.sh
@@ -4,10 +4,17 @@
 # The script ran within the Docker container to build the Liana GUI.
 # =================================================================
 
+set -xe
 
 # Build the GUI for Windows. The Windows Portable Execution (PE) format contains some timestamps.
 # Instruct ld to set them to 0.
-RUSTFLAGS="-Clink-arg=-Wl,--no-insert-timestamp" /liana/rust-1.65.0-x86_64-unknown-linux-gnu/cargo/bin/cargo rustc --release --target x86_64-pc-windows-gnu
+alias cargo="/liana/rust-1.65.0-x86_64-unknown-linux-gnu/cargo/bin/cargo"
+RUSTFLAGS="-Clink-arg=-Wl,--no-insert-timestamp" \
+    cargo rustc \
+        --release \
+        --target x86_64-pc-windows-gnu
 
 # Avoid having to get root on the host to remove the target dir.
 chmod -R a+rw target/
+
+set +xe