diff --git a/Makefile b/Makefile
index 4fe6afbf747acced944f68d7d06a98326048eb6e..73f55fd7fc1d6ee13f109082713bf69b28b93333 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-default: install
+default: clean test install sdist
 
 # Building
 
@@ -17,8 +17,11 @@ test: build
 haddock: configure
 	cabal haddock
 
-install: build test haddock
-	cabal install --user --enable-library-profiling --enable-executable-profiling
+copy: build test haddock
+	cabal copy
+
+install:
+	cabal install --user --ghc-options=-Werror --enable-library-profiling --enable-executable-profiling
 
 sdist: clean configure
 	cabal sdist
@@ -26,4 +29,4 @@ sdist: clean configure
 # switch off intermediate file deletion
 .SECONDARY:
 
-.PHONY: default clean configure build haddock install test sdist
+.PHONY: default clean configure build haddock copy install test sdist
diff --git a/time.cabal b/time.cabal
index 334fa08b6537166abb84fc3096a3e1129598aff5..fad816c70a86f0f2396b79183d2acbfbb6694b35 100644
--- a/time.cabal
+++ b/time.cabal
@@ -1,5 +1,5 @@
 name:           time
-version:        1.4.1
+version:        1.4.2
 stability:      stable
 license:        BSD3
 license-file:   LICENSE