diff --git a/scripts.d/25-zlib.sh b/scripts.d/25-zlib.sh
new file mode 100755
index 0000000..2140e83
--- /dev/null
+++ b/scripts.d/25-zlib.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+ZLIB_SRC="https://zlib.net/zlib-1.2.11.tar.gz"
+
+ffbuild_enabled() {
+    return 0
+}
+
+ffbuild_dockerstage() {
+    to_df "ADD $SELF /root/zlib.sh"
+    to_df "RUN bash -c 'source /root/zlib.sh && ffbuild_dockerbuild && rm /root/zlib.sh'"
+}
+
+ffbuild_dockerbuild() {
+    mkdir zlib
+    cd zlib
+
+    wget "$ZLIB_SRC" -O zlib.tar.gz || return -1
+    tar xaf zlib.tar.gz || return -1
+    rm zlib.tar.gz
+    cd zlib* || return -1
+
+    local myconf=(
+        --prefix="$FFBUILD_PREFIX"
+        --static
+    )
+
+    if [[ $TARGET == win* ]]; then
+        export CC="${FFBUILD_CROSS_PREFIX}gcc"
+        export AR="${FFBUILD_CROSS_PREFIX}ar"
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    ./configure "${myconf[@]}" || return -1
+    make -j$(nproc) || return -1
+    make install || return -1
+
+    cd ../..
+    rm -rf zlib
+}
+
+ffbuild_configure() {
+    echo --enable-zlib
+}
+
+ffbuild_unconfigure() {
+    echo --disable-zlib
+}
+
+ffbuild_cflags() {
+    return 0
+}
+
+ffbuild_ldflags() {
+    return 0
+}