diff --git a/pkgs/development/compilers/clasp/default.nix b/pkgs/development/compilers/clasp/default.nix
index 6ff2028e3c1..2c260e110d6 100644
--- a/pkgs/development/compilers/clasp/default.nix
+++ b/pkgs/development/compilers/clasp/default.nix
@@ -70,5 +70,6 @@ stdenv.mkDerivation rec {
     maintainers = [stdenv.lib.maintainers.raskin];
     platforms = stdenv.lib.platforms.linux;
     homepage = "https://github.com/drmeister/clasp";
+    broken = true; # 2018-09-08, no successful build since 2018-01-03
   };
 }
diff --git a/pkgs/development/libraries/qt-5/modules/qtwebengine.nix b/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
index aae15c62d73..ad54a49e50b 100644
--- a/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
+++ b/pkgs/development/libraries/qt-5/modules/qtwebengine.nix
@@ -189,6 +189,7 @@ EOF
     description = "A web engine based on the Chromium web browser";
     maintainers = with maintainers; [ matthewbauer ];
     platforms = platforms.unix;
+    broken = qt56; # 2018-09-13, no successful build since 2018-04-25
   };
 
 }
diff --git a/pkgs/development/tools/haskell/leksah/default.nix b/pkgs/development/tools/haskell/leksah/default.nix
index f1c754ddff9..ec2fb334a3b 100644
--- a/pkgs/development/tools/haskell/leksah/default.nix
+++ b/pkgs/development/tools/haskell/leksah/default.nix
@@ -14,4 +14,8 @@ in stdenv.mkDerivation {
       --prefix PATH : "${leksahEnv}/bin" \
       --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"
   '';
+
+  meta = {
+    broken = true; # 2018-09-13, no successful hydra build since 2017-08-19
+  };
 }
diff --git a/pkgs/games/btanks/default.nix b/pkgs/games/btanks/default.nix
index 8379e1aa7bb..d606662323f 100644
--- a/pkgs/games/btanks/default.nix
+++ b/pkgs/games/btanks/default.nix
@@ -32,5 +32,6 @@ stdenv.mkDerivation rec {
     homepage = https://sourceforge.net/projects/btanks/;
     description = "Fast 2d tank arcade game";
     license = stdenv.lib.licenses.gpl2Plus;
+    broken = true; # 2018-09-13, no successful build since 2018-03-16
   };
 }
diff --git a/pkgs/os-specific/darwin/maloader/default.nix b/pkgs/os-specific/darwin/maloader/default.nix
index 133266ec95a..d1df820615d 100644
--- a/pkgs/os-specific/darwin/maloader/default.nix
+++ b/pkgs/os-specific/darwin/maloader/default.nix
@@ -33,5 +33,6 @@ stdenv.mkDerivation {
     homepage = https://github.com/shinh/maloader;
     license = stdenv.lib.licenses.bsd2;
     platforms = stdenv.lib.platforms.linux;
+    broken = true; # 2018-09-08, no succesful build since 2017-08-21
   };
 }
diff --git a/pkgs/servers/kippo/default.nix b/pkgs/servers/kippo/default.nix
index a9f5ba6f7b2..3ebcaf7286b 100644
--- a/pkgs/servers/kippo/default.nix
+++ b/pkgs/servers/kippo/default.nix
@@ -95,5 +95,6 @@ in stdenv.mkDerivation rec {
       license = licenses.bsd3;
       platforms = platforms.linux;
       maintainers = with maintainers; [ tomberek ];
+      broken = true; # 2018-09-12, failed on hydra since 2017-12-11
     };
 }
diff --git a/pkgs/servers/web-apps/frab/default.nix b/pkgs/servers/web-apps/frab/default.nix
index 657bd423f3f..d6a5128b813 100644
--- a/pkgs/servers/web-apps/frab/default.nix
+++ b/pkgs/servers/web-apps/frab/default.nix
@@ -48,5 +48,6 @@ stdenv.mkDerivation rec {
     description = "Web-based conference planning and management system";
     homepage = https://github.com/frab/frab;
     license = licenses.mit;
+    broken = true; # 2018-09-08; no successful hydra build since 2018-02-14
   };
 }