diff --git a/qtah-generator.cabal b/qtah-generator.cabal
--- a/qtah-generator.cabal
+++ b/qtah-generator.cabal
@@ -1,5 +1,5 @@
 name: qtah-generator
-version: 0.1.0
+version: 0.1.1
 synopsis: Generator for Qtah Qt bindings
 homepage: http://khumba.net/projects/qtah
 license: LGPL-3
diff --git a/src/Graphics/UI/Qtah/Generator/Flags.hs b/src/Graphics/UI/Qtah/Generator/Flags.hs
--- a/src/Graphics/UI/Qtah/Generator/Flags.hs
+++ b/src/Graphics/UI/Qtah/Generator/Flags.hs
@@ -99,13 +99,30 @@
       let version = map (read :: String -> Int) strs
       case version of
         [_, _] -> return version
-        [x] -> queryQmakeQtVersion ["-qt=" ++ show x]
+        [x] -> queryQmakeQtVersion $ Just x
         _ -> fail $ concat
              ["qtah-generator: Internal error, incorrect parsing of QTAH_QT value ", show str, "."]
-    Nothing -> queryQmakeQtVersion []
+    Nothing -> queryQmakeQtVersion Nothing
 
-  where queryQmakeQtVersion :: [String] -> IO Version
-        queryQmakeQtVersion extraArgs = do
+  where queryQmakeQtVersion :: Maybe Int -> IO Version
+        queryQmakeQtVersion maybePreferredMajorVersion = do
+          case maybePreferredMajorVersion of
+            Nothing ->
+              -- No major version preference, so take whatever Qt is available.
+              queryQmakeQtVersion' []
+            Just preferredMajorVersion -> do
+              -- Even though we have a preferred major version, we don't want to
+              -- run "qmake -qt=X -version" initially because we might be on a
+              -- system (NixOS) where qtchooser isn't available and the only
+              -- qmake available *is* the desired version.  Only pass "-qt=X" if
+              -- we get the wrong default version.
+              defaultVersion <- queryQmakeQtVersion' []
+              case defaultVersion of
+                (x:_) | x == preferredMajorVersion -> return defaultVersion
+                _ -> queryQmakeQtVersion' ["-qt=" ++ show preferredMajorVersion]
+
+        queryQmakeQtVersion' :: [String] -> IO Version
+        queryQmakeQtVersion' extraArgs = do
           qmakePath <- findQMake
           let args = extraArgs ++ ["-version"]
           (exitCode, out, err) <- readProcessWithExitCode qmakePath args ""
diff --git a/src/Graphics/UI/Qtah/Generator/Interface/Core/QList.hs-boot b/src/Graphics/UI/Qtah/Generator/Interface/Core/QList.hs-boot
--- a/src/Graphics/UI/Qtah/Generator/Interface/Core/QList.hs-boot
+++ b/src/Graphics/UI/Qtah/Generator/Interface/Core/QList.hs-boot
@@ -15,8 +15,6 @@
 -- You should have received a copy of the GNU Lesser General Public License
 -- along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-{-# LANGUAGE CPP #-}
-
 -- | Bindings for @QList@.
 module Graphics.UI.Qtah.Generator.Interface.Core.QList (
   c_QListQObject,