diff --git a/hsfiles/mongo.hsfiles b/hsfiles/mongo.hsfiles
--- a/hsfiles/mongo.hsfiles
+++ b/hsfiles/mongo.hsfiles
@@ -436,6 +436,10 @@
                  , fast-logger                   >= 2.2        && < 2.3
                  , wai-logger                    >= 2.2        && < 2.3
 
+    -- see https://github.com/yesodweb/yesod/issues/814
+    if !os(windows)
+        build-depends: unix
+
 executable         PROJECTNAME
     if flag(library-only)
         Buildable: False
diff --git a/hsfiles/mysql.hsfiles b/hsfiles/mysql.hsfiles
--- a/hsfiles/mysql.hsfiles
+++ b/hsfiles/mysql.hsfiles
@@ -440,6 +440,10 @@
                  , fast-logger                   >= 2.2        && < 2.3
                  , wai-logger                    >= 2.2        && < 2.3
 
+    -- see https://github.com/yesodweb/yesod/issues/814
+    if !os(windows)
+        build-depends: unix
+
 executable         PROJECTNAME
     if flag(library-only)
         Buildable: False
diff --git a/hsfiles/postgres-fay.hsfiles b/hsfiles/postgres-fay.hsfiles
--- a/hsfiles/postgres-fay.hsfiles
+++ b/hsfiles/postgres-fay.hsfiles
@@ -477,6 +477,10 @@
                  , fast-logger                   >= 2.2        && < 2.3
                  , wai-logger                    >= 2.2        && < 2.3
 
+    -- see https://github.com/yesodweb/yesod/issues/814
+    if !os(windows)
+        build-depends: unix
+
 executable         PROJECTNAME
     if flag(library-only)
         Buildable: False
diff --git a/hsfiles/postgres.hsfiles b/hsfiles/postgres.hsfiles
--- a/hsfiles/postgres.hsfiles
+++ b/hsfiles/postgres.hsfiles
@@ -440,6 +440,10 @@
                  , fast-logger                   >= 2.2        && < 2.3
                  , wai-logger                    >= 2.2        && < 2.3
 
+    -- see https://github.com/yesodweb/yesod/issues/814
+    if !os(windows)
+        build-depends: unix
+
 executable         PROJECTNAME
     if flag(library-only)
         Buildable: False
diff --git a/hsfiles/simple.hsfiles b/hsfiles/simple.hsfiles
--- a/hsfiles/simple.hsfiles
+++ b/hsfiles/simple.hsfiles
@@ -364,6 +364,10 @@
                  , fast-logger                   >= 2.2        && < 2.3
                  , wai-logger                    >= 2.2        && < 2.3
 
+    -- see https://github.com/yesodweb/yesod/issues/814
+    if !os(windows)
+        build-depends: unix
+
 executable         PROJECTNAME
     if flag(library-only)
         Buildable: False
diff --git a/hsfiles/sqlite.hsfiles b/hsfiles/sqlite.hsfiles
--- a/hsfiles/sqlite.hsfiles
+++ b/hsfiles/sqlite.hsfiles
@@ -440,6 +440,10 @@
                  , fast-logger                   >= 2.2        && < 2.3
                  , wai-logger                    >= 2.2        && < 2.3
 
+    -- see https://github.com/yesodweb/yesod/issues/814
+    if !os(windows)
+        build-depends: unix
+
 executable         PROJECTNAME
     if flag(library-only)
         Buildable: False
diff --git a/input/done.cg b/input/done.cg
--- a/input/done.cg
+++ b/input/done.cg
@@ -24,4 +24,4 @@
 
 Start your project:
 
-   cd PROJECTNAME && cabal sandbox init && cabal install --enable-tests . yesod-platform yesod-bin --max-backjumps=-1 --reorder-goals && yesod devel
+   cd PROJECTNAME && cabal sandbox init && cabal install -j --enable-tests . yesod-platform yesod-bin --max-backjumps=-1 --reorder-goals && yesod devel
diff --git a/yesod-bin.cabal b/yesod-bin.cabal
--- a/yesod-bin.cabal
+++ b/yesod-bin.cabal
@@ -1,5 +1,5 @@
 name:            yesod-bin
-version:         1.2.12.5
+version:         1.2.12.6
 license:         MIT
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -74,7 +74,7 @@
                      , system-fileio      >= 0.3          && < 0.4
                      , unordered-containers
                      , yaml               >= 0.8          && < 0.9
-                     , optparse-applicative >= 0.5
+                     , optparse-applicative >= 0.5        && <= 0.9.1.1
                      , fsnotify           >= 0.0          && < 0.2
                      , split              >= 0.2          && < 0.3
                      , file-embed