diff --git a/pkgs/development/libraries/v8/3.24.10.nix b/pkgs/development/libraries/v8/3.24.10.nix
deleted file mode 100644
index e7b10f23ac8..00000000000
--- a/pkgs/development/libraries/v8/3.24.10.nix
+++ /dev/null
@@ -1,6 +0,0 @@
-{ callPackage, ... } @ args:
-
-callPackage ./generic.nix (args // {
-  version = "3.24.10";
-  sha256 = "1blz5h9syk93bb4x3shcai3s2jhh6ai4bpymr9rz0f1ysvg60x75";
-})
diff --git a/pkgs/development/libraries/v8/6_x.nix b/pkgs/development/libraries/v8/6_x.nix
new file mode 100644
index 00000000000..4095ff20c2b
--- /dev/null
+++ b/pkgs/development/libraries/v8/6_x.nix
@@ -0,0 +1,171 @@
+{ stdenv, lib, fetchgit, fetchFromGitHub, gn, ninja, python, glib, pkgconfig
+, doCheck ? false
+, snapshot ? true
+}:
+
+let
+  arch = if stdenv.isArm
+         then if stdenv.is64bit
+              then"arm64"
+              else "arm"
+         else if stdenv.is64bit
+              then"x64"
+              else "ia32";
+  git_url = "https://chromium.googlesource.com";
+
+  deps = {
+    "base/trace_event/common" = fetchgit {
+      url = "${git_url}/chromium/src/base/trace_event/common.git";
+      rev = "65d1d42a5df6c0a563a6fdfa58a135679185e5d9";
+      sha256 = "0ikk0dj12adzr0138jrmwzhx8n9sl5qzs86a3mc3gva08a8wc84p";
+    };
+    "build" = fetchgit {
+      url = "${git_url}/chromium/src/build.git";
+      rev = "48a2b7b39debc7c77c868c9ddb0a360af1ebc367";
+      sha256 = "0aj554dfdbwnikwaapznfq55wkwbvg4114h7qamixy8ryjkaiy0k";
+    };
+    "buildtools" = fetchgit {
+      url = "${git_url}/chromium/buildtools.git";
+      rev = "5af0a3a8b89827a8634132080a39ab4b63dee489";
+      sha256 = "1841803m40w1hmnmm7qzdpk4b6q1m8cb7q4hsflqfpddpf4lp3v1";
+    };
+    "test/benchmarks/data" = fetchgit {
+      url = "${git_url}/v8/deps/third_party/benchmarks.git";
+      rev = "05d7188267b4560491ff9155c5ee13e207ecd65f";
+      sha256 = "0ad2ay14bn67d61ks4dmzadfnhkj9bw28r4yjdjjyzck7qbnzchl";
+    };
+    "test/mozilla/data" = fetchgit {
+      url = "${git_url}/v8/deps/third_party/mozilla-tests.git";
+      rev = "f6c578a10ea707b1a8ab0b88943fe5115ce2b9be";
+      sha256 = "0rfdan76yfawqxbwwb35aa57b723j3z9fx5a2w16nls02yk2kqyn";
+    };
+    "test/test262/data" = fetchgit {
+      url = "${git_url}/external/github.com/tc39/test262.git";
+      rev = "1b911a8f8abf4cb63882cfbe72dcd4c82bb8ad91";
+      sha256 = "1hbp7vv41k7jka8azc78hhw4qng7gckr6dz1van7cyd067znwvr4";
+    };
+    "test/test262/harness" = fetchgit {
+      url = "${git_url}/external/github.com/test262-utils/test262-harness-py.git";
+      rev = "0f2acdd882c84cff43b9d60df7574a1901e2cdcd";
+      sha256 = "00brj5avp43yamc92kinba2mg3a2x1rcd7wnm7z093l73idprvkp";
+    };
+    "test/wasm-js" = fetchgit {
+      url = "${git_url}/external/github.com/WebAssembly/spec.git";
+      rev = "17b4a4d98c80b1ec736649d5a73496a0e6d12d4c";
+      sha256 = "03nyrrqffzj6xrmqi1v7f9m9395bdk53x301fy5mcq4hhpq6rsjr";
+    };
+    "testing/gmock" = fetchgit {
+      url = "${git_url}/external/googlemock.git";
+      rev = "0421b6f358139f02e102c9c332ce19a33faf75be";
+      sha256 = "1xiky4v98maxs8fg1avcd56y0alv3hw8qyrlpd899zgzbq2k10pp";
+    };
+    "testing/gtest" = fetchgit {
+      url = "${git_url}/external/github.com/google/googletest.git";
+      rev = "6f8a66431cb592dad629028a50b3dd418a408c87";
+      sha256 = "0bdba2lr6pg15bla9600zg0r0vm4lnrx0wqz84p376wfdxra24vw";
+    };
+    "third_party/icu" = fetchgit {
+      url = "${git_url}/chromium/deps/icu.git";
+      rev = "08cb956852a5ccdba7f9c941728bb833529ba3c6";
+      sha256 = "0vn2iv068kmcjqqx5cgyha80x9iraz11hpx3q4n3rkvrlvbb3d7b";
+    };
+    "third_party/instrumented_libraries" = fetchgit {
+      url = "${git_url}/chromium/src/third_party/instrumented_libraries.git";
+      rev = "644afd349826cb68204226a16c38bde13abe9c3c";
+      sha256 = "0d1vkwilgv1a4ghazn623gwmm7h51padpfi94qrmig1y748xfwfa";
+    };
+    # templates of code generator require jinja2 2.8 (while nixpkgs has 2.9.5, which breaks the template)
+    "third_party/jinja2" = fetchgit {
+      url = "${git_url}/chromium/src/third_party/jinja2.git";
+      rev = "d34383206fa42d52faa10bb9931d6d538f3a57e0";
+      sha256 = "0d9hyw0bvp3p0dbwy833cm9vdqxcam0qbm9jc561ynphddxlkmgd";
+    };
+    "third_party/markupsafe" = fetchgit {
+      url = "${git_url}/chromium/src/third_party/markupsafe.git";
+      rev = "8f45f5cfa0009d2a70589bcda0349b8cb2b72783";
+      sha256 = "168ppjmicfdh4i1l0l25s86mdbrz9fgxmiq1rx33x79mph41scfz";
+    };
+    "tools/clang" = fetchgit {
+      url = "${git_url}/chromium/src/tools/clang.git";
+      rev = "40f69660bf3cd407e72b8ae240fdd6c513dddbfe";
+      sha256 = "1plkb9dcn34yd6lad7w59s9vqwmcc592dasgdk232spkafpg8qcf";
+    };
+  };
+
+in
+
+stdenv.mkDerivation rec {
+  name = "v8-${version}";
+  version = "6.2.414.27";
+
+  inherit doCheck;
+
+  src = fetchFromGitHub {
+    owner = "v8";
+    repo = "v8";
+    rev = version;
+    sha256 = "15zrb9bcpnhljhrilqnjaak3a4xnhj8li6ra12g3gkrw3fzir9a2";
+  };
+
+  postUnpack = ''
+    ${lib.concatStringsSep "\n" (
+      lib.mapAttrsToList (n: v: ''
+        mkdir -p $sourceRoot/${n}
+        cp -r ${v}/* $sourceRoot/${n}
+      '') deps)}
+  '';
+
+  prePatch = ''
+    # use our gn, not the bundled one
+    sed -i -e 's#gn_path = .*#gn_path = "${gn}/bin/gn"#' tools/mb/mb.py
+
+    # disable tests
+    if [ "$doCheck" = "" ]; then sed -i -e '/"test:gn_all",/d' BUILD.gn; fi
+
+    # disable sysroot usage
+    chmod u+w build/config build/config/sysroot.gni
+    sed -i build/config/sysroot.gni \
+        -e '/use_sysroot =/ { s#\(use_sysroot =\).*#\1 false#; :a  n; /current_cpu/ { s/^/#/; ba };  }'
+
+    # patch shebangs (/usr/bin/env)
+    patchShebangs tools/dev/v8gen.py
+  '';
+
+  configurePhase = ''
+    tools/dev/v8gen.py -vv ${arch}.release -- \
+        is_component_build=true \
+        ${if snapshot then "v8_use_external_startup_data=false" else "v8_use_snapshot=false" } \
+        is_clang=false \
+        linux_use_bundled_binutils=false \
+        treat_warnings_as_errors=false
+  '';
+
+  nativeBuildInputs = [ gn ninja pkgconfig ];
+  buildInputs = [ python glib ];
+
+  buildPhase = ''
+    ninja -C out.gn/${arch}.release/
+  '';
+
+  enableParallelBuilding = true;
+
+  installPhase = ''
+    install -vD out.gn/${arch}.release/d8 "$out/bin/d8"
+    install -vD out.gn/${arch}.release/mksnapshot "$out/bin/mksnapshot"
+    mkdir -p "$out/lib"
+    for f in libicui18n.so libicuuc.so libv8_libbase.so libv8_libplatform.so libv8.so; do
+        install -vD out.gn/${arch}.release/$f "$out/lib/$f"
+    done
+    install -vD out.gn/${arch}.release/icudtl.dat "$out/lib/icudtl.dat"
+    mkdir -p "$out/include"
+    cp -vr include/*.h "$out/include"
+    cp -vr include/libplatform "$out/include"
+  '';
+
+  meta = with lib; {
+    description = "Google's open source JavaScript engine";
+    maintainers = with maintainers; [ cstrahan proglodyte ];
+    platforms = platforms.linux;
+    license = licenses.bsd3;
+  };
+}
diff --git a/pkgs/development/libraries/v8/generic.nix b/pkgs/development/libraries/v8/generic.nix
deleted file mode 100644
index d603fda3225..00000000000
--- a/pkgs/development/libraries/v8/generic.nix
+++ /dev/null
@@ -1,79 +0,0 @@
-{ stdenv, fetchurl, gyp, readline, python, which, icu
-, version
-, sha256
-, ...
-}:
-
-assert readline != null;
-
-let
-  arch = if stdenv.is64bit then "x64" else "ia32";
-in
-
-stdenv.mkDerivation rec {
-  name = "v8-${version}";
-  inherit version;
-
-  src = fetchurl {
-    url = "https://commondatastorage.googleapis.com/chromium-browser-official/"
-        + "${name}.tar.bz2";
-    inherit sha256;
-  };
-
-  patchPhase = ''
-    sed -i 's,#!/usr/bin/env python,#!${python}/bin/python,' build/gyp_v8
-  '';
-
-  configurePhase = ''
-    PYTHONPATH="tools/generate_shim_headers:$PYTHONPATH" \
-    PYTHONPATH="$(toPythonPath ${gyp}):$PYTHONPATH" \
-      build/gyp_v8 \
-        -f make \
-        --generator-output="out" \
-        -Dflock_index=0 \
-        -Dv8_enable_i18n_support=1 \
-        -Duse_system_icu=1 \
-        -Dconsole=readline \
-        -Dcomponent=shared_library \
-        -Dv8_target_arch=${arch}
-  '';
-
-  nativeBuildInputs = [ which ];
-  buildInputs = [ readline python icu ];
-
-  NIX_CFLAGS_COMPILE = "-Wno-error=strict-overflow";
-
-  buildFlags = [
-    "LINK=g++"
-    "-C out"
-    "builddir=$(CURDIR)/Release"
-    "BUILDTYPE=Release"
-  ];
-
-  postPatch = stdenv.lib.optionalString (!stdenv.cc.isClang) ''
-    sed -i build/standalone.gyp -e 's,-Wno-format-pedantic,,g'
-  '';
-
-  enableParallelBuilding = true;
-
-  installPhase = ''
-    install -vD out/Release/d8 "$out/bin/d8"
-    ${if stdenv.system == "x86_64-darwin" then ''
-    install -vD out/Release/lib.target/libv8.dylib "$out/lib/libv8.dylib"
-    '' else ''
-    install -vD out/Release/lib.target/libv8.so "$out/lib/libv8.so"
-    ''}
-    cp -vr include "$out/"
-  '';
-
-  postFixup = if stdenv.isDarwin then ''
-    install_name_tool -change /usr/local/lib/libv8.dylib $out/lib/libv8.dylib -change /usr/lib/libgcc_s.1.dylib ${stdenv.cc.cc.lib}/lib/libgcc_s.1.dylib $out/bin/d8
-    install_name_tool -id $out/lib/libv8.dylib -change /usr/lib/libgcc_s.1.dylib ${stdenv.cc.cc.lib}/lib/libgcc_s.1.dylib $out/lib/libv8.dylib
-  '' else null;
-
-  meta = with stdenv.lib; {
-    description = "Google's open source JavaScript engine";
-    platforms = platforms.linux;
-    license = licenses.bsd3;
-  };
-}
diff --git a/pkgs/development/libraries/v8/update.sh b/pkgs/development/libraries/v8/update.sh
new file mode 100755
index 00000000000..f046bb8e688
--- /dev/null
+++ b/pkgs/development/libraries/v8/update.sh
@@ -0,0 +1,47 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash -p curl -p nix-prefetch-git
+VERSION_OVERVIEW=https://omahaproxy.appspot.com/all?os=linux
+TARGET_CHANNEL=beta
+FILE_PATH=6_x.nix
+
+set -eo pipefail
+
+v8_version=$(curl -s "$VERSION_OVERVIEW" | awk -F "," "\$2 ~ /${TARGET_CHANNEL}/ { print \$11 }")
+
+echo "Using V8 version --> $v8_version"
+sed -e "s#\\(version = \\)\"[0-9\.]*\"#\1\"$v8_version\"#" -i ${FILE_PATH}
+
+sha256=$(nix-prefetch-git --no-deepClone https://github.com/v8/v8.git "refs/tags/${v8_version}" \
+    | sed -ne '/sha256/ { s#.*: "\(.*\)".*#\1#; p }')
+sed -e "/repo = \"v8\"/ { n;n; s#\".*\"#\"${sha256}\"# }" -i ${FILE_PATH}
+
+deps="$(mktemp)"
+
+curl -s -o "$deps" "https://raw.githubusercontent.com/v8/v8/${v8_version}/DEPS"
+echo $deps
+
+sed -ne '/= fetchgit {/ { s/.*"\(.*\)".*/\1/; p }' < ${FILE_PATH} | while read dep; do
+    echo "Processing dependency --> $dep"
+    escaped_dep=$(echo "$dep" | sed -e 's#/#\\/#g')
+    dep_rev=$(sed -ne "/\"v8\/${escaped_dep}\":/ { n; s#.*+ \"##; s#\".*##;  p }" "$deps")
+
+    if [ "$dep_rev" = "" ]; then
+        echo "Failed to resolve dependency $dep, not listed in DEPS file"
+        rm -f "$deps"
+        exit 2
+    fi
+
+    repo_url=$(sed -ne "/\"${escaped_dep}\" = fetchgit/ { n; s/.*\"\(.*\)\".*/\1/; s#\${git_url}#https://chromium.googlesource.com#; p }"  ${FILE_PATH})
+    sha256=$(nix-prefetch-git --no-deepClone "$repo_url" "$dep_rev" 2>/dev/null | sed -ne '/sha256/ { s#.*: "\(.*\)".*#\1#; p }')
+
+    if [ "$sha256" = "" ]; then
+        echo "Failed to get sha256 via nix-prefetch-git $repo_url $dep_rev"
+        rm -f "$deps"
+        exit 2
+    fi
+
+    sed -e "/\"${escaped_dep}\" = fetchgit/ { n; n; s/\".*\"/\"${dep_rev}\"/; n; s/\".*\"/\"${sha256}\"/  }" -i ${FILE_PATH}
+done
+
+rm -f "$deps"
+echo done.
diff --git a/pkgs/development/tools/build-managers/gn/default.nix b/pkgs/development/tools/build-managers/gn/default.nix
new file mode 100644
index 00000000000..5e7dd5214a0
--- /dev/null
+++ b/pkgs/development/tools/build-managers/gn/default.nix
@@ -0,0 +1,77 @@
+{ stdenv, lib, fetchgit, fetchurl, libevent, ninja, python }:
+
+let
+  depsGit = {
+    "tools/gn" = fetchgit {
+      url = "https://chromium.googlesource.com/chromium/src/tools/gn";
+      rev = "d0c518db129975ce88ff1de26c857873b0619c4b";
+      sha256 = "0l15vzmjyx6bwlz1qhn3fy7yx3qzzxr3drnkj3l0p0fmyxza52vx";
+    };
+    "base" = fetchgit {
+      url = "https://chromium.googlesource.com/chromium/src/base";
+      rev = "bc6e3ce8ca01b894751e1f7b22b561e3ae2e7f17";
+      sha256 = "1yl49v6nxbrfms52xf7fiwh7d4301m2aj744pa3hzzh989c5j6g5";
+    };
+    "build" = fetchgit {
+      url = "https://chromium.googlesource.com/chromium/src/build";
+      rev = "e934a19ae908081fba13769924e4ea45a7a451ce";
+      sha256 = "0jhy418vaiin7djg9zvk83f8zhasigki4442x5j7gkmgmgmyc4am";
+    };
+    "config" = fetchgit {
+      url = "https://chromium.googlesource.com/chromium/src/build/config";
+      rev = "df16c6a2c070704b0a25efe46ee9af16de1e65b3";
+      sha256 = "1x18syzz1scwhd8lf448hy5lnfpq118l403x9qmwm0np318w09wg";
+    };
+    "testing/gtest" = fetchgit {
+      url = "https://chromium.googlesource.com/chromium/testing/gtest";
+      rev = "585ec31ea716f08233a815e680fc0d4699843938";
+      sha256 = "0csn1cza66851nmxxiw42smsm3422mx67vcyykwn0a71lcjng6rc";
+    };
+  };
+
+in
+  stdenv.mkDerivation rec {
+    name = "gn";
+    version = "0.0.0.20170629";
+    sourceRoot = ".";
+
+    unpackPhase = ''
+      ${lib.concatStringsSep "\n" (
+        lib.mapAttrsToList (n: v: ''
+          mkdir -p $sourceRoot/${n}
+          cp -r ${v}/* $sourceRoot/${n}
+        '') depsGit)}
+    '';
+
+    postPatch = ''
+      # Patch shebands (for sandbox build)
+      chmod u+w -R build
+      patchShebangs build
+
+      # Patch out Chromium-bundled libevent
+      chmod u+w tools/gn/bootstrap tools/gn/bootstrap/bootstrap.py
+      sed -i -e '/static_libraries.*libevent/,/^ *\]\?[})]$/d' \
+          tools/gn/bootstrap/bootstrap.py
+    '';
+
+    NIX_LDFLAGS = "-levent";
+
+    nativeBuildInputs = [ ninja python ];
+    buildInputs = [ libevent ];
+
+    buildPhase = ''
+      python tools/gn/bootstrap/bootstrap.py -s
+    '';
+
+    installPhase = ''
+      install -vD out/Release/gn "$out/bin/gn"
+    '';
+
+    meta = with stdenv.lib; {
+      description = "A meta-build system that generates NinjaBuild files";
+      homepage = https://chromium.googlesource.com/chromium/src/tools/gn;
+      license = licenses.bsd3;
+      platforms = platforms.linux;
+      maintainers = [ maintainers.stesie ];
+    };
+  }
diff --git a/pkgs/servers/nosql/eventstore/default.nix b/pkgs/servers/nosql/eventstore/default.nix
index 572cfe1f17d..e6bf634b554 100644
--- a/pkgs/servers/nosql/eventstore/default.nix
+++ b/pkgs/servers/nosql/eventstore/default.nix
@@ -1,16 +1,16 @@
-{ stdenv, fetchFromGitHub, fetchpatch, mono, v8 }:
+{ stdenv, fetchFromGitHub, fetchpatch, git, mono, v8 }:
 
 # There are some similarities with the pinta derivation. We should
 # have a helper to make it easy to package these Mono apps.
 
 stdenv.mkDerivation rec {
   name = "EventStore-${version}";
-  version = "3.5.0";
+  version = "4.0.3";
   src = fetchFromGitHub {
     owner  = "EventStore";
     repo   = "EventStore";
     rev    = "oss-v${version}";
-    sha256 = "0dp5914hxwdzw62q49wavqfqkw3jy0dvml09y7gh8frnbiajcxq9";
+    sha256 = "1905bnqyyiqprva67cp49rgib324iipw2l71jzj0ynzi7kxr4mgg";
   };
 
   buildPhase = ''
@@ -33,6 +33,7 @@ stdenv.mkDerivation rec {
     chmod +x $out/bin/clusternode
   '';
 
+  nativeBuildInputs = [ git ];
   buildInputs = [ v8 mono ];
 
   phases = [ "unpackPhase" "buildPhase" "installPhase" ];
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 18bb248c33c..8d87a483bee 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7391,6 +7391,8 @@ with pkgs;
 
   ninja = callPackage ../development/tools/build-managers/ninja { };
 
+  gn = callPackage ../development/tools/build-managers/gn { };
+
   nixbang = callPackage ../development/tools/misc/nixbang {
       pythonPackages = python3Packages;
   };
@@ -10840,9 +10842,8 @@ with pkgs;
     stdenv = overrideCC stdenv gcc5;
   };
 
-  v8_3_24_10 = callPackage ../development/libraries/v8/3.24.10.nix {
-    inherit (python2Packages) python gyp;
-    stdenv = overrideCC stdenv gcc5;
+  v8_6_x = callPackage ../development/libraries/v8/6_x.nix {
+    inherit (python2Packages) python;
   };
 
   v8 = callPackage ../development/libraries/v8 {
@@ -11458,7 +11459,8 @@ with pkgs;
   elasticmq = callPackage ../servers/elasticmq { };
 
   eventstore = callPackage ../servers/nosql/eventstore {
-    v8 = v8_3_24_10;
+    mono = mono46;
+    v8 = v8_6_x;
   };
 
   etcdctl = etcd;
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 20b8c15f388..5e6192bf673 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -267,44 +267,23 @@ let
   };
 
   v8 = assert isPhp7; buildPecl rec {
-    version = "0.1.0";
+    version = "0.1.9";
     name = "v8-${version}";
 
-    src = pkgs.fetchurl {
-      url = "https://github.com/pinepain/php-v8/archive/v${version}.tar.gz";
-      sha256 = "18smnxd34b486f5n8j0wk9z7r5x1w84v89mgf76z0bn7gxdxl0xj";
-    };
+    sha256 = "0bj77dfmld5wfwl4wgqnpa0i4f3mc1mpsp9dmrwqv050gs84m7h1";
 
-    buildInputs = [ pkgs.v8 ];
-    configureFlags = [ "--with-v8=${pkgs.v8}" ];
-
-    patches = [
-      (builtins.toFile "link-libv8_libbase.patch" ''
-        Index: php-v8/config.m4
-        ===================================================================
-        --- php-v8.orig/config.m4
-        +++ php-v8/config.m4
-        @@ -69,7 +69,7 @@ if test "$PHP_V8" != "no"; then
-               #static_link_extra="libv8_base.a libv8_libbase.a libv8_libplatform.a libv8_snapshot.a"
-               ;;
-             * )
-        -      static_link_extra="libv8_libplatform.a"
-        +      static_link_extra="libv8_libplatform.a libv8_libbase.a"
-               #static_link_extra="libv8_base.a libv8_libbase.a libv8_libplatform.a libv8_snapshot.a"
-               ;;
-           esac
-	''
-      )];
+    buildInputs = [ pkgs.v8_6_x ];
+    configureFlags = [ "--with-v8=${pkgs.v8_6_x}" ];
   };
 
   v8js = assert isPhp7; buildPecl rec {
-    version = "1.3.2";
+    version = "1.4.1";
     name = "v8js-${version}";
 
-    sha256 = "1x7gxi70zgj3vaxs89nfbnwlqcxrps1inlyfzz66pbzdbfwvc8z8";
+    sha256 = "0k5dc395gzva4l6n9mzvkhkjq914460cwk1grfandcqy73j6m89q";
 
-    buildInputs = [ pkgs.v8 ];
-    configureFlags = [ "--with-v8js=${pkgs.v8}" ];
+    buildInputs = [ pkgs.v8_6_x ];
+    configureFlags = [ "--with-v8js=${pkgs.v8_6_x}" ];
   };
 
   composer = pkgs.stdenv.mkDerivation rec {