diff --git a/Makefile b/Makefile
index f915ad35..4d3ff06d 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ SRC_EXAMPLES=$(shell find src/examples -type f)
 SOLUTIONS=$(patsubst src/examples/%, build/solutions/%, $(SRC_EXAMPLES))
 EXERCISES=$(patsubst src/examples/%, build/exercises/%, $(SRC_EXAMPLES))
 
-CN=cn verify
+CN="cn verify"
 
 exercises: $(EXERCISES) $(SOLUTIONS)
 
@@ -47,15 +47,15 @@ build/exercises.zip: $(EXERCISES)
 ##############################################################################
 # Check that the examples all run correctly 
 
-CN_PATH ?= cn 
+CN_PATH?="cn verify"
 
 check-archive: 
 	@echo Check archive examples
-	@$(MAKEFILE_DIR)/src/example-archive/check-all.sh "$(CN_PATH)"
+	@$(MAKEFILE_DIR)/src/example-archive/check-all.sh $(CN_PATH)
 
 check-tutorial:
 	@echo Check tutorial examples
-	@$(MAKEFILE_DIR)/check.sh "$(CN_PATH)"
+	@$(MAKEFILE_DIR)/check.sh $(CN_PATH)
 
 check: check-tutorial check-archive 
 
diff --git a/src/example-archive/check-all.sh b/src/example-archive/check-all.sh
index 085b17ce..37a0d476 100755
--- a/src/example-archive/check-all.sh
+++ b/src/example-archive/check-all.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env bash 
+# #!/usr/bin/env bash 
 
 SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
 
@@ -7,7 +7,7 @@ then
   echo "check-all.sh: using CN=$1 in $PWD"
   CN="$1"
 else
-  CN=cn verify
+  CN="cn verify"
 fi
 
 subdirs=(
diff --git a/src/example-archive/check.sh b/src/example-archive/check.sh
index 40addd36..6f713d5c 100755
--- a/src/example-archive/check.sh
+++ b/src/example-archive/check.sh
@@ -5,7 +5,7 @@ then
   echo "check.sh: using CN=$1 in $PWD"
   CN="$1"
 else
-  CN=cn verify
+  CN="cn verify"
 fi
 
 process_files() {
diff --git a/src/example-archive/open-sut/working/mps_1.c b/src/example-archive/open-sut/working/mps_1.c
index 8f3e29f9..9f64148c 100644
--- a/src/example-archive/open-sut/working/mps_1.c
+++ b/src/example-archive/open-sut/working/mps_1.c
@@ -19,7 +19,7 @@ typedef uint8_t w2;
 typedef uint8_t w8;
 
 /*@
-  function (bool) P_Coincidence_2_4(bool a, bool b, bool c, bool d) {
+  function (boolean) P_Coincidence_2_4(boolean a, boolean b, boolean c, boolean d) {
     (a&&b) || ((a||b) && (c||d)) || (c&&d)
   }