nixos: adjust to 20.09 changes

Most notably the php5 expression needed to be reworked.

nix/pkgs/default.nix

@@ -1,12 +1,5 @@
 { pkgs }:
 let
-  # one application requires php5
-  nixpkgsWithPhp5 = pkgs.fetchFromGitHub {
-    owner = "nixos";
-    repo = "nixpkgs-channels";
-    rev = "846d8f8305192dcc3a63139102698b4ac6b9ef9f";
-    sha256 = "1qifgc1q2i4g0ivpfjnxp4jl2cc82gfjws08dsllgw7q7kw4b4rb";
-  };
 
 in rec {
   nixpkgs-master = import <nixpkgs-master> {};
@@ -31,7 +24,7 @@ in rec {
           extraMeta.branch = "5.4";
         } // (args.argsOverride or {}));
       linux_sgx = pkgs.callPackage linux_sgx_pkg {};
-    in 
+    in
       pkgs.recurseIntoAttrs (pkgs.linuxPackagesFor linux_sgx);
   linuxPackages_sgx_latest = linuxPackages_sgx_540rc3;
 
@@ -47,11 +40,32 @@ in rec {
     enableStatic = true;
   };
 
-  php56 = (pkgs.callPackages
-    "${nixpkgsWithPhp5}/pkgs/development/interpreters/php/default.nix" {
+  php5 = let
+    nixpkgsWithPhp5 = pkgs.fetchFromGitHub {
+      owner = "nixos";
+      repo = "nixpkgs-channels";
+      rev = "pkgs";
+      sha256 = "1qifgc1q2i4g0ivpfjnxp4jl2cc82gfjws08dsllgw7q7kw4b4rb";
+    };
+    php5 = (pkgs.callPackage "${nixpkgsWithPhp5}/pkgs/development/interpreters/php/default.nix" {
+      config = (pkgs.lib.attrsets.recursiveUpdate
+        pkgs.config
+        {
+          php = {
+            imap = false;
+            openssl = false;
+            curl = false;
+            ldap = false;
+            mcrypt = false;
+          };
+        }
+      );
+      stdenv = pkgs.llvmPackages_6.stdenv; #broken
       icu = pkgs.icu60;
-    })
-    .php56.overrideAttrs(drv: rec {
+    }).php56;
+  in
+    php5
+    .overrideAttrs(attrs: rec {
       # See https://secure.php.net/ChangeLog-5.php
       version = "5.6.40";
       name = "php-${version}";
@@ -61,6 +75,11 @@ in rec {
         url = "http://www.php.net/distributions/php-${version}.tar.bz2";
         inherit sha256;
       };
+
+      configureFlags = attrs.configureFlags ++ [
+        "--without-fpm-systemd"
+      ];
+
     });
 
   duplicacy = pkgs.callPackage ../pkgs/duplicacy {};