Merge branch 'master' into closure-size

Beware that stdenv doesn't build. It seems something more will be needed
than just resolution of merge conflicts.

pkgs/servers/http/apache-httpd/2.4.nix

@@ -1,6 +1,7 @@
 { stdenv, fetchurl, perl, zlib, apr, aprutil, pcre, libiconv
 , proxySupport ? true
 , sslSupport ? true, openssl
+, http2Support ? true, libnghttp2
 , ldapSupport ? true, openldap
 , libxml2Support ? true, libxml2
 , luaSupport ? false, lua5
@@ -12,6 +13,7 @@ in
 
 assert sslSupport -> aprutil.sslSupport && openssl != null;
 assert ldapSupport -> aprutil.ldapSupport && openldap != null;
+assert http2Support -> libnghttp2 != null;
 
 stdenv.mkDerivation rec {
   version = "2.4.18";
@@ -30,6 +32,7 @@ stdenv.mkDerivation rec {
     optional sslSupport openssl ++
     optional ldapSupport openldap ++    # there is no --with-ldap flag
     optional libxml2Support libxml2 ++
+    optional http2Support libnghttp2 ++
     optional stdenv.isDarwin libiconv;
 
   patchPhase = ''
@@ -56,6 +59,7 @@ stdenv.mkDerivation rec {
     --enable-cgi
     ${optionalString proxySupport "--enable-proxy"}
     ${optionalString sslSupport "--enable-ssl"}
+    ${optionalString http2Support "--enable-http2 --with-nghttp2=${libnghttp2}"}
     ${optionalString luaSupport "--enable-lua --with-lua=${lua5}"}
     ${optionalString libxml2Support "--with-libxml2=${libxml2.dev}/include/libxml2"}
     --docdir=$(doc)/share/doc

pkgs/servers/http/apt-cacher-ng/default.nix

@@ -2,20 +2,21 @@
 
 stdenv.mkDerivation rec {
   name = "apt-cacher-ng-${version}";
-  version = "0.8.6";
+  version = "0.9.1";
 
   src = fetchurl {
     url = "http://ftp.debian.org/debian/pool/main/a/apt-cacher-ng/apt-cacher-ng_${version}.orig.tar.xz";
-    sha256 = "0044dfks8djl11fs28jj8894i4rq424xix3d3fkvzz2i6lnp8nr5";
+    sha256 = "1d686knvig1niapc1ib2045f7jfad3m4jvz6gkwm276fqvm4p694";
   };
 
   NIX_LDFLAGS = "-lpthread";
-  buildInputs = [ doxygen cmake zlib openssl bzip2 pkgconfig libpthreadstubs ];
+  nativeBuildInputs = [ cmake doxygen pkgconfig ];
+  buildInputs = [ zlib openssl bzip2 libpthreadstubs ];
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "A caching proxy specialized for linux distribution files";
-    homepage = http://www.unix-ag.uni-kl.de/~bloch/acng/;
-    license = stdenv.lib.licenses.gpl2;
-    maintainers = [ stdenv.lib.maintainers.makefu ];
+    homepage = https://www.unix-ag.uni-kl.de/~bloch/acng/;
+    license = licenses.gpl2;
+    maintainers = [ maintainers.makefu ];
   };
 }

pkgs/servers/http/nginx/modules.nix

@@ -1,6 +1,16 @@
 { fetchFromGitHub, pkgs }:
 
 {
+  brotli = {
+    src = fetchFromGitHub {
+      owner = "google";
+      repo = "ngx_brotli";
+      rev = "788615eab7c5e0a984278113c55248305620df14";
+      sha256 = "02514bbjdhm9m38vljdh626d3c1783jxsxawv5c6bzblwmb8xgvf";
+    };
+    inputs = [ pkgs.libbrotli ];
+  };
+
   rtmp = {
     src = fetchFromGitHub {
       owner = "arut";