--- a/debian/patches/reproducible_build.diff	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/reproducible_build.diff	2019-06-20 09:19:14.235731290 +0100
@@ -0,0 +1,15 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby@debian.org>
+Last-Update: 2019-06-20
+
+--- node-d3-contour-1.3.2.orig/rollup.config.js
++++ node-d3-contour-1.3.2/rollup.config.js
+@@ -10,7 +10,7 @@ const config = {
+     format: "umd",
+     indent: false,
+     extend: true,
+-    banner: `// ${meta.homepage} v${meta.version} Copyright ${(new Date).getFullYear()} ${meta.author.name}`,
++    banner: `// ${meta.homepage} v${meta.version} Copyright ${(new Date(process.env.SOURCE_DATE_EPOCH ? (process.env.SOURCE_DATE_EPOCH * 1000) : new Date().getTime())).getFullYear()} ${meta.author.name}`,
+     globals: Object.assign({}, ...Object.keys(meta.dependencies || {}).filter(key => /^d3-/.test(key)).map(key => ({[key]: "d3"})))
+   },
+   plugins: [
--- a/debian/patches/series	2019-06-20 09:15:44.953091853 +0100
--- b/debian/patches/series	2019-06-20 09:19:13.183718749 +0100
@@ -1 +1,2 @@
 remove_terser_add_commonjs.diff
+reproducible_build.diff