diff --git a/scripts.d/25-gmp.sh b/scripts.d/25-gmp.sh
new file mode 100755
index 0000000..55b47e3
--- /dev/null
+++ b/scripts.d/25-gmp.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+
+GMP_SRC="https://gmplib.org/download/gmp/gmp-6.2.0.tar.xz"
+
+ffbuild_enabled() {
+    return 0
+}
+
+ffbuild_dockerstage() {
+    to_df "ADD $SELF /root/gmp.sh"
+    to_df "RUN bash -c 'source /root/gmp.sh && ffbuild_dockerbuild && rm /root/gmp.sh'"
+}
+
+ffbuild_dockerbuild() {
+    mkdir gmp
+    cd gmp
+
+    wget "$GMP_SRC" -O gmp.tar.xz || return -1
+    tar xaf gmp.tar.xz || return -1
+    rm gmp.tar.xz
+    cd gmp* || return -1
+
+    autoreconf -i || return -1
+
+    local myconf=(
+        --prefix="$FFBUILD_PREFIX"
+        --disable-shared
+        --enable-static
+    )
+
+    if [[ $TARGET == win* ]]; then
+        myconf+=(
+            --host="$FFBUILD_TOOLCHAIN"
+        )
+    else
+        echo "Unknown target"
+        return -1
+    fi
+
+    ./configure "${myconf[@]}" || return -1
+    make -j$(nproc) || return -1
+    make install || return -1
+
+    cd ../..
+    rm -rf gmp
+}
+
+ffbuild_configure() {
+    echo --enable-gmp
+}
+
+ffbuild_unconfigure() {
+    echo --disable-gmp
+}