Fix #54

WORKSPACE

@@ -1,25 +1,36 @@
 workspace(name = "butteraugli")
 
-new_http_archive(
-  name = "png_archive",
-  url = "http://github.com/glennrp/libpng/archive/v1.2.57.zip",
-  sha256 = "a941dc09ca00148fe7aaf4ecdd6a67579c293678ed1e1cf633b5ffc02f4f8cf7",
-  strip_prefix = "libpng-1.2.57",
-  build_file = "png.BUILD",
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "png_archive",
+    build_file = "@//:png.BUILD",
+    sha256 = "e45ce5f68b1d80e2cb9a2b601605b374bdf51e1798ef1c2c2bd62131dfcf9eef",
+    strip_prefix = "libpng-1.6.34",
+    urls = [
+        "https://mirror.bazel.build/github.com/glennrp/libpng/archive/v1.6.34.tar.gz",
+        "https://github.com/glennrp/libpng/archive/v1.6.34.tar.gz",
+    ],
 )
 
-new_http_archive(
-  name = "zlib_archive",
-  url = "http://zlib.net/fossils/zlib-1.2.10.tar.gz",
-  sha256 = "8d7e9f698ce48787b6e1c67e6bff79e487303e66077e25cb9784ac8835978017",
-  strip_prefix = "zlib-1.2.10",
-  build_file = "zlib.BUILD",
+http_archive(
+    name = "zlib_archive",
+    build_file = "@//:zlib.BUILD",
+    sha256 = "c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1",
+    strip_prefix = "zlib-1.2.11",
+    urls = [
+        "https://mirror.bazel.build/zlib.net/zlib-1.2.11.tar.gz",
+        "https://zlib.net/zlib-1.2.11.tar.gz",
+    ],
 )
 
-new_http_archive(
-  name = "jpeg_archive",
-  url = "http://www.ijg.org/files/jpegsrc.v9b.tar.gz",
-  sha256 = "240fd398da741669bf3c90366f58452ea59041cacc741a489b99f2f6a0bad052",
-  strip_prefix = "jpeg-9b",
-  build_file = "jpeg.BUILD",
+http_archive(
+    name = "jpeg_archive",
+    build_file = "@//:jpeg.BUILD",
+    sha256 = "240fd398da741669bf3c90366f58452ea59041cacc741a489b99f2f6a0bad052",
+    strip_prefix = "jpeg-9b",
+    urls = [
+        "https://mirror.bazel.build/www.ijg.org/files/jpegsrc.v9b.tar.gz",
+        "http://www.ijg.org/files/jpegsrc.v9b.tar.gz",
+    ],
 )