diff --git a/install-all.sh b/install-all.sh
index a4328497..ce017dd4 100755
--- a/install-all.sh
+++ b/install-all.sh
@@ -7,6 +7,8 @@ for package in $PACKAGES
 do
     echo Installing $package
     cd $package
-    $CABAL configure --enable-tests && $CABAL build && $CABAL test && ./Setup.lhs install || exit
+    ($CABAL configure --enable-tests ||
+      ($CABAL install --only-dependencies && $CABAL configure --enable-tests)
+    ) && $CABAL build && $CABAL test && ./Setup.lhs install || exit
     cd ..
 done