Install to /usr/local/bin when root installs.

remove-duplicates-from-sorted-fastq/Haskell/install.sh

@@ -66,4 +66,11 @@ doctest --version 2> /dev/null \
 
 make_stack_options
 stack ${stack_options} build --exec "hlint src/Main.hs" --exec "scan -j False src/Main.hs" --exec "doctest src/Main.hs"
-stack install
+
+if [ "${USER}" == "root" ]
+then
+    # We don't want things to be installed in root's home directory.
+    stack install --local-bin-path "/usr/local/bin"
+else
+    stack install
+fi