diff --git a/makefile b/makefile
index 1b18dec3..076a2218 100644
--- a/makefile
+++ b/makefile
@@ -135,6 +135,7 @@ full: configuration
 	@make -f src/tools/make/vishap.make -s installable
 	@make -f src/tools/make/vishap.make -s clean
 # Make bootstrap compiler from source suitable for current data model
+	@printf "\n\n--- Compiler build started ---\n\n"
 	@make -f src/tools/make/vishap.make -s compilerfromsavedsource
 # Use bootstrap compiler to make compiler binary from latest compiler sources
 	@make -f src/tools/make/vishap.make -s translate
@@ -144,10 +145,12 @@ full: configuration
 	@make -f src/tools/make/vishap.make -s assemble
 	@printf "\n\n--- Compiler build successfull ---\n\n"
 	@make -f src/tools/make/vishap.make -s browsercmd
+	@printf "\n\n--- Library build started ---\n\n"
 	@make -f src/tools/make/vishap.make -s library
 	@printf "\n\n--- Library build successfull ---\n\n"
-	@make -f src/tools/make/vishap.make -s checksum
+	@make -f src/tools/make/vishap.make -s sourcechanges
 	@make -f src/tools/make/vishap.make -s install
+	@printf "\n\n--- Confidence tests started ---\n\n"
 	@make -f src/tools/make/vishap.make -s confidence
 	@make -f src/tools/make/vishap.make -s showpath
 
diff --git a/src/tools/make/pt.pl b/src/tools/make/pt.pl
index 0c3243c1..e8da4b4b 100755
--- a/src/tools/make/pt.pl
+++ b/src/tools/make/pt.pl
@@ -12,33 +12,35 @@ my %status = ();
 sub parselog {
   my ($fn) = @_;
   #print "Parsing log $fn\n";
-  my $date       = "";
-  my $time       = "";
-  my $branch     = "";
-  my $os         = "";
-  my $compiler   = "";
-  my $datamodel  = "";
-  my $compilerok = "";
-  my $libraryok  = "";
-  my $checksum   = "";
-  my $tests      = "";
+  my $date         = "";
+  my $time         = "";
+  my $branch       = "";
+  my $os           = "";
+  my $compiler     = "";
+  my $datamodel    = "";
+  my $compilerok   = "";
+  my $libraryok    = "";
+  my $sourcechange = "";
+  my $tests        = "";
   open(my $log, $fn) // die "Couldn't open build log $fn.";
   while (<$log>) {
     if (/^([0-9\/]+) [0-9.]+ [^ ]+\.log$/) {$date = $1;}
     if (/^[^ ]+ --- Cleaning branch ([^ ]+) ([^ ]+) ([^ ]+) ([^ ]+) ---$/) {
       ($branch, $os, $compiler, $datamodel) = ($1, $2, $3, $4, $5);
     }
-    if (/^([0-9.]+) --- Compiler build successfull ---$/)    {$compilerok = "Built";}
-    if (/^([0-9.]+) --- Library build successfull ---$/)     {$libraryok  = "Built";}
-    if (/^([0-9.]+) --- Confidence tests passed ---$/)       {$tests      = "Passed";}
-    if (/^([0-9.]+) --- Object file checksums match ---$/)   {$checksum   = "Match";}
-    if (/^([0-9.]+) --- Object file checksum mismatch ---$/) {$checksum   = "Changed";}
-    if (/^([0-9.]+) --- Object files checksummed ---$/)      {$checksum   = "New";}
+    if (/^([0-9.]+) --- Compiler build started ---$/)                         {$compilerok   = "Started";}
+    if (/^([0-9.]+) --- Compiler build successfull ---$/)                     {$compilerok   = "Built";}
+    if (/^([0-9.]+) --- Library build started ---$/)                          {$libraryok    = "Started";}
+    if (/^([0-9.]+) --- Library build successfull ---$/)                      {$libraryok    = "Built";}
+    if (/^([0-9.]+) --- Generated c source files match bootstrap ---$/)       {$sourcechange = "Unchanged";}
+    if (/^([0-9.]+) --- Generated c source files differ from bootstrap ---$/) {$sourcechange = "Changed";}
+    if (/^([0-9.]+) --- Confidence tests started ---$/)                       {$tests        = "Started";}
+    if (/^([0-9.]+) --- Confidence tests passed ---$/)                        {$tests        = "Passed";}
   }
   close($log);
   my $key = "$os-$compiler-$datamodel";
   if ($key ne "") {
-    $status{$key} = [$date, $time, $os, $compiler, $datamodel, $branch, $compilerok, $libraryok, $checksum, $tests];
+    $status{$key} = [$date, $time, $os, $compiler, $datamodel, $branch, $compilerok, $libraryok, $sourcechange, $tests];
   }
 }
 
@@ -86,19 +88,19 @@ svgtext($svg, $col2, 0, "#e0e0e0", "Compiler");
 svgtext($svg, $col3, 0, "#e0e0e0", "Data model");
 svgtext($svg, $col4, 0, "#e0e0e0", "Compiler");
 svgtext($svg, $col5, 0, "#e0e0e0", "Library");
-svgtext($svg, $col6, 0, "#e0e0e0", "Checksum");
+svgtext($svg, $col6, 0, "#e0e0e0", "C Source");
 svgtext($svg, $col7, 0, "#e0e0e0", "Tests");
 
 my $i=1;
 for my $key (sort keys %status) {
   my ($date, $time, $os, $compiler, $datamodel,
-      $branch, $compilerok, $libraryok, $checksum, $tests) = @{$status{$key}};
+      $branch, $compilerok, $libraryok, $sourcechange, $tests) = @{$status{$key}};
   svgtext($svg, $col1, $i, "#c0c0c0", $os);
   svgtext($svg, $col2, $i, "#c0c0c0", $compiler);
   svgtext($svg, $col3, $i, "#c0c0c0", $datamodel);
   svgtext($svg, $col4, $i, "#60ff60", $compilerok);
   svgtext($svg, $col5, $i, "#60ff60", $libraryok);
-  svgtext($svg, $col6, $i, "#60ff60", $checksum);
+  svgtext($svg, $col6, $i, "#60ff60", $sourcechange);
   svgtext($svg, $col7, $i, "#60ff60", $tests);
   $i++;
 }
diff --git a/src/tools/make/sourcechanges.sh b/src/tools/make/sourcechanges.sh
new file mode 100644
index 00000000..47129832
--- /dev/null
+++ b/src/tools/make/sourcechanges.sh
@@ -0,0 +1,33 @@
+# Source change tests.
+#
+# Compares compiler source files against the appropriate bootstrap source.
+# The voc compiler version comment line is skipped.
+#
+# Parameters
+#
+#   $1 - bootstrap directory
+#
+# Assumptions
+#
+#   The current directory is the build directory
+
+changes="0"
+for f in $1/*; do
+  fn=$(basename $f)
+  egrep -v "^/\* voc  " $f  >$fn.old
+  egrep -v "^/\* voc  " $fn >$fn.new
+  if ! diff --tabsize=2 -U 2 -b $fn.old $fn.new >$fn.diff; then
+    echo ""
+    echo ""
+    cat $fn.diff
+    changes=1;
+  fi
+  rm -f $fn.old $fn.new $fn.diff
+done
+echo ""
+if [ $changes == "0" ]; then
+  echo "--- Generated c source files match bootstrap ---"
+else
+  echo "--- Generated c source files differ from bootstrap ---"
+fi
+echo ""
diff --git a/src/tools/make/vishap.make b/src/tools/make/vishap.make
index 4cbbf52e..544b6708 100644
--- a/src/tools/make/vishap.make
+++ b/src/tools/make/vishap.make
@@ -363,8 +363,8 @@ library: v4 ooc2 ooc ulm pow32 misc s3 librarybinary
 
 
 
-checksum:
-	@cd $(BUILDDIR) && sh $(ROOTDIR)/src/tools/make/checksumtest.sh $(ROOTDIR)/$(BUILDDIR).$(BRANCH).md5
+sourcechanges:
+	@cd $(BUILDDIR) && sh $(ROOTDIR)/src/tools/make/sourcechanges.sh $(ROOTDIR)/bootstrap/$(PLATFORM)-$(ADRSIZE)$(ALIGNMENT)