--- a/mail/config/tooltool-manifests/linux32/releng.manifest
+++ b/mail/config/tooltool-manifests/linux32/releng.manifest
@@ -1,43 +1,18 @@
 [
   {
-    "version": "gcc 4.9.4 + PR64905",
-    "size": 101297752,
-    "digest": "42aa2e3fdd232b5e390472a788e7f7db71a1fee4221e260b6cb58c9a1d73e6cdd10afcbac137f7844290169cd6b561b424ecc92b159e9726b0ad5de3f478a8be",
-    "algorithm": "sha512",
-    "filename": "gcc.tar.xz",
-    "unpack": true
-  },
-  {
     "size": 11189216,
     "digest": "18bc52b0599b1308b667e282abb45f47597bfc98a5140cfcab8da71dacf89dd76d0dee22a04ce26fe7ad1f04e2d6596991f9e5b01fd2aaaab5542965f596b0e6",
     "algorithm": "sha512",
     "filename": "gtk3.tar.xz",
     "setup": "setup.sh",
     "unpack": true
   },
   {
     "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
     "size": 161014632,
     "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
-  },
-  {
-    "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
-    "algorithm": "sha512",
-    "visibility": "public",
-    "filename": "sccache2.tar.xz",
-    "unpack": true,
-    "digest": "7bbe53cda3f608826dc6a0266e648cd2ea09c88ef93edf87d582b41185b72740667e2c7bf6e9b2b911fb2915cbfb985e528598c7b3153092ad27d5e937342df7",
-    "size": 2191380
-  },
-  {
-    "version": "clang + llvm 3.9.0, built from SVN r290136",
-    "size": 166261192,
-    "digest": "52f3fc23f0f5c98050f8b0ac7c92a6752d067582a16f712a5a58074be98975d594f9e36249fc2be7f1cc2ca6d509c663faaf2bea66f949243cc1f41651638ba6",
-    "algorithm": "sha512",
-    "filename": "clang.tar.xz",
-    "unpack": true
   }
 ]

--- a/mail/config/tooltool-manifests/linux64/asan.manifest
+++ b/mail/config/tooltool-manifests/linux64/asan.manifest
@@ -1,35 +1,10 @@
 [
   {
-    "version": "gcc 4.9.4 + PR64905",
-    "size": 101297752,
-    "digest": "42aa2e3fdd232b5e390472a788e7f7db71a1fee4221e260b6cb58c9a1d73e6cdd10afcbac137f7844290169cd6b561b424ecc92b159e9726b0ad5de3f478a8be",
-    "algorithm": "sha512",
-    "filename": "gcc.tar.xz",
-    "unpack": true
-  },
-  {
-    "version": "clang 3.9.0, libgcc 4.9.4",
-    "size": 166261192,
-    "digest": "52f3fc23f0f5c98050f8b0ac7c92a6752d067582a16f712a5a58074be98975d594f9e36249fc2be7f1cc2ca6d509c663faaf2bea66f949243cc1f41651638ba6",
-    "algorithm": "sha512",
-    "filename": "clang.tar.xz",
-    "unpack": true
-  },
-  {
-    "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
-    "algorithm": "sha512",
-    "visibility": "public",
-    "filename": "sccache2.tar.xz",
-    "unpack": true,
-    "digest": "7bbe53cda3f608826dc6a0266e648cd2ea09c88ef93edf87d582b41185b72740667e2c7bf6e9b2b911fb2915cbfb985e528598c7b3153092ad27d5e937342df7",
-    "size": 2191380
-  },
-  {
     "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
     "size": 161014632,
     "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
   },
   {

--- a/mail/config/tooltool-manifests/linux64/clang.manifest
+++ b/mail/config/tooltool-manifests/linux64/clang.manifest
@@ -1,35 +1,18 @@
 [
   {
-    "version": "clang 3.9.0",
-    "size": 166261192,
-    "digest": "52f3fc23f0f5c98050f8b0ac7c92a6752d067582a16f712a5a58074be98975d594f9e36249fc2be7f1cc2ca6d509c663faaf2bea66f949243cc1f41651638ba6",
-    "algorithm": "sha512",
-    "filename": "clang.tar.xz",
-    "unpack": true
-  },
-  {
     "size": 12072532,
     "digest": "3915f8ec396c56a8a92e6f9695b70f09ce9d1582359d1258e37e3fd43a143bc974410e4cfc27f500e095f34a8956206e0ebf799b7287f0f38def0d5e34ed71c9",
     "algorithm": "sha512",
     "filename": "gtk3.tar.xz",
     "setup": "setup.sh",
     "unpack": true
   },
   {
     "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
     "size": 161014632,
     "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
-  },
-  {
-    "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
-    "algorithm": "sha512",
-    "visibility": "public",
-    "filename": "sccache2.tar.xz",
-    "unpack": true,
-    "digest": "7bbe53cda3f608826dc6a0266e648cd2ea09c88ef93edf87d582b41185b72740667e2c7bf6e9b2b911fb2915cbfb985e528598c7b3153092ad27d5e937342df7",
-    "size": 2191380
   }
 ]

--- a/mail/config/tooltool-manifests/linux64/releng.manifest
+++ b/mail/config/tooltool-manifests/linux64/releng.manifest
@@ -1,43 +1,18 @@
 [
   {
-    "version": "gcc 4.9.4 + PR64905",
-    "size": 101297752,
-    "digest": "42aa2e3fdd232b5e390472a788e7f7db71a1fee4221e260b6cb58c9a1d73e6cdd10afcbac137f7844290169cd6b561b424ecc92b159e9726b0ad5de3f478a8be",
-    "algorithm": "sha512",
-    "filename": "gcc.tar.xz",
-    "unpack": true
-  },
-  {
     "size": 12072532,
     "digest": "3915f8ec396c56a8a92e6f9695b70f09ce9d1582359d1258e37e3fd43a143bc974410e4cfc27f500e095f34a8956206e0ebf799b7287f0f38def0d5e34ed71c9",
     "algorithm": "sha512",
     "filename": "gtk3.tar.xz",
     "setup": "setup.sh",
     "unpack": true
   },
   {
     "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
     "size": 161014632,
     "digest": "65bebcf94fc66ea618c58c9ac33f0f206095ecfe3931cc6edb301f4b40480e3b44b0f39aea7a25fed8eef47e63523e7e670082947a3662cdc04c68ebbe5dfc89",
     "algorithm": "sha512",
     "filename": "rustc.tar.xz",
     "unpack": true
-  },
-  {
-    "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
-    "algorithm": "sha512",
-    "visibility": "public",
-    "filename": "sccache2.tar.xz",
-    "unpack": true,
-    "digest": "7bbe53cda3f608826dc6a0266e648cd2ea09c88ef93edf87d582b41185b72740667e2c7bf6e9b2b911fb2915cbfb985e528598c7b3153092ad27d5e937342df7",
-    "size": 2191380
-  },
-  {
-    "version": "clang + llvm 3.9.0, built from SVN r290136",
-    "size": 166261192,
-    "digest": "52f3fc23f0f5c98050f8b0ac7c92a6752d067582a16f712a5a58074be98975d594f9e36249fc2be7f1cc2ca6d509c663faaf2bea66f949243cc1f41651638ba6",
-    "algorithm": "sha512",
-    "filename": "clang.tar.xz",
-    "unpack": true
   }
 ]

--- a/mail/config/tooltool-manifests/win32/releng.manifest
+++ b/mail/config/tooltool-manifests/win32/releng.manifest
@@ -9,25 +9,16 @@
     "version": "rustc 1.19.0 (0ade33941 2017-07-17) repack",
     "size": 97017057,
     "digest": "b726645f9d26c5a3048720b3839166021c1cf91a02d2ff2f10c49adced7455c7352e18b5052084d80bf9d1c40ec1bf72d0397921b8cd23262f89fdbd10def58f",
     "algorithm": "sha512",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
   {
-    "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
-    "algorithm": "sha512",
-    "visibility": "public",
-    "filename": "sccache2.tar.bz2",
-    "unpack": true,
-    "digest": "7a40983b93536aaa9d6953777612b7dcc170b1acab91b377f4f9e697a316b586d477435a93ac32d086f685d52bfe3ea47e99f96e0374c224c3c11c702dbd9ab6",
-    "size": 1879437
-  },
-  {
     "version": "Visual Studio 2015 Update 3 14.0.25425.01 / SDK 10.0.14393.0",
     "size": 326656969,
     "digest": "babc414ffc0457d27f5a1ed24a8e4873afbe2f1c1a4075469a27c005e1babc3b2a788f643f825efedff95b79686664c67ec4340ed535487168a3482e68559bc7",
     "algorithm": "sha512",
     "filename": "vs2015u3.zip",
     "unpack": true
   },
   {

--- a/mail/config/tooltool-manifests/win64/releng.manifest
+++ b/mail/config/tooltool-manifests/win64/releng.manifest
@@ -10,25 +10,16 @@
     "size": 103602526,
     "digest": "558d2d18991ad8b250a5d6b46a55e1ffdffc50d6bdd9cb4b3a945dd3d1143836b32e47f1df612bfea97ca2c02333ed43055b6c3030ecb1632385fb6940c1d246",
     "algorithm": "sha512",
     "visibility": "public",
     "filename": "rustc.tar.bz2",
     "unpack": true
   },
   {
-    "version": "sccache rev 69334a26ba65fc88e3934271a2ce6781c51b445e",
-    "algorithm": "sha512",
-    "visibility": "public",
-    "filename": "sccache2.tar.bz2",
-    "unpack": true,
-    "digest": "7a40983b93536aaa9d6953777612b7dcc170b1acab91b377f4f9e697a316b586d477435a93ac32d086f685d52bfe3ea47e99f96e0374c224c3c11c702dbd9ab6",
-    "size": 1879437
-  },
-  {
     "version": "Visual Studio 2015 Update 3 14.0.25425.01 / SDK 10.0.14393.0",
     "size": 326656969,
     "digest": "babc414ffc0457d27f5a1ed24a8e4873afbe2f1c1a4075469a27c005e1babc3b2a788f643f825efedff95b79686664c67ec4340ed535487168a3482e68559bc7",
     "algorithm": "sha512",
     "filename": "vs2015u3.zip",
     "unpack": true
   },
   {