diff --git a/ivette/ivette-opam.sh b/ivette/ivette-opam.sh
index da24175d949f06035cb71839333d3e3f9d725ac0..d358c807e547804fe4adc84e8d12545c6199f442 100755
--- a/ivette/ivette-opam.sh
+++ b/ivette/ivette-opam.sh
@@ -21,6 +21,10 @@
 #                                                                        #
 ##########################################################################
 
+# --------------------------------------------------------------------------
+# ---  Ivette bootstrapper for OPAM installation
+# --------------------------------------------------------------------------
+
 echo "Building Ivette"
 PWD=`pwd`
 
@@ -55,7 +59,7 @@ fi
 echo "[2/3] Compiling Ivette"
 # --------------------------------------------------------------------------
 
-TMPDIR=`mktemp -d -t ivette`
+TMPDIR=`mktemp -d`
 cd $TMPDIR
 tar zxf $PREFIX/lib/frama-c/ivette.tgz
 cd ivette
diff --git a/ivette/makefile.opam b/ivette/makefile.opam
index fee44db5e7a6c3895bc1138a3e6da5aff90f9ca5..3739c68ef0870d4048b68d88e46dc1637ba0c7f0 100644
--- a/ivette/makefile.opam
+++ b/ivette/makefile.opam
@@ -27,15 +27,17 @@
 .PHONY: install uninstall
 
 install:
-	@echo "Installing Ivette (OPAM)"
-	mkdir -p $(PREFIX)/bin
-	install ivette/ivette-opam.sh $(PREFIX)/bin/ivette
-	mkdir -p $(PREFIX)/lib/frama-c
-	tar zcf $(PREFIX)/lib/frama-c/ivette.tgz ivette
+	@echo "Installing Ivette…"
+	@mkdir -p $(PREFIX)/bin
+	@install ivette/ivette-opam.sh $(PREFIX)/bin/ivette
+	@mkdir -p $(PREFIX)/lib/frama-c
+	@tar zcf $(PREFIX)/lib/frama-c/ivette.tgz ivette
+	@echo "Done"
 
 uninstall:
-	@echo "Removing Ivette"
+	@echo "Removing Ivette…"
 	@rm -f $(PREFIX)/bin/ivette
 	@rm -f $(PREFIX)/lib/frama-c/ivette.tgz
 	@rm -fr $(PREFIX)/lib/ivette     # linux
 	@rm -fr /Applications/Ivette.app # macOS
+	@echo "Done"