diff --git a/lang/cem/ctest/makefile b/lang/cem/ctest/makefile
index f3fe6bde..639bbc46 100644
--- a/lang/cem/ctest/makefile
+++ b/lang/cem/ctest/makefile
@@ -3,7 +3,11 @@ CEM=acc
 head:
 	echo use run
 
-diffs:  $P.pcc.r $P.cc.r $P.cem.r
+diffs:	$P.cc.r $P.cem.r
+	echo two compiler diff
+	-diff $P.*.r
+
+diffs3:  $P.pcc.r $P.cc.r $P.cem.r
 	echo three compiler diff
 	-diff3 $P.*.r | tee diffs
 egen:   $P.e
@@ -46,4 +50,4 @@ opr:
 	make pr | opr
 
 clean:
-	-rm -f $P.[kmsoe] core a.out *.old
+	-rm -f $P.[kmsoe] $P.*.r core a.out *.old
diff --git a/lang/cem/ctest/makefile.i86 b/lang/cem/ctest/makefile.i86
index aa5adf49..5fec701b 100644
--- a/lang/cem/ctest/makefile.i86
+++ b/lang/cem/ctest/makefile.i86
@@ -3,7 +3,11 @@ CEM=i86 -DNOFLOAT
 head:
 	echo use run
 
-diffs:  $P.pcc.r $P.cc.r $P.cem.r
+diffs:	$P.cc.r $P.cem.r
+	echo two compiler diff
+	-diff $P.*.r
+
+diffs3:  $P.pcc.r $P.cc.r $P.cem.r
 	echo three compiler diff
 	-diff3 $P.*.r | tee diffs
 egen:   $P.e
@@ -47,4 +51,4 @@ opr:
 	make pr | opr
 
 clean:
-	-rm -f $P.[kmsoe] core a.out *.old
+	-rm -f $P.[kmsoe] $P.*.r core a.out *.old
diff --git a/lang/cem/ctest/makefile.int b/lang/cem/ctest/makefile.int
index 37d9fde5..82c77f0b 100644
--- a/lang/cem/ctest/makefile.int
+++ b/lang/cem/ctest/makefile.int
@@ -3,7 +3,11 @@ CEM=int -O
 head:
 	echo use run
 
-diffs:  $P.pcc.r $P.cc.r $P.cem.r
+diffs:	$P.cc.r $P.cem.r
+	echo two compiler diff
+	-diff $P.*.r
+
+diffs3:  $P.pcc.r $P.cc.r $P.cem.r
 	echo three compiler diff
 	-diff3 $P.*.r | tee diffs
 egen:   $P.e
@@ -46,4 +50,4 @@ opr:
 	make pr | opr
 
 clean:
-	-rm -f $P.[kmsoe] core a.out *.old
+	-rm -f $P.[kmsoe] $P.*.r core a.out *.old
diff --git a/lang/cem/ctest/makefile.std b/lang/cem/ctest/makefile.std
index f3fe6bde..639bbc46 100644
--- a/lang/cem/ctest/makefile.std
+++ b/lang/cem/ctest/makefile.std
@@ -3,7 +3,11 @@ CEM=acc
 head:
 	echo use run
 
-diffs:  $P.pcc.r $P.cc.r $P.cem.r
+diffs:	$P.cc.r $P.cem.r
+	echo two compiler diff
+	-diff $P.*.r
+
+diffs3:  $P.pcc.r $P.cc.r $P.cem.r
 	echo three compiler diff
 	-diff3 $P.*.r | tee diffs
 egen:   $P.e
@@ -46,4 +50,4 @@ opr:
 	make pr | opr
 
 clean:
-	-rm -f $P.[kmsoe] core a.out *.old
+	-rm -f $P.[kmsoe] $P.*.r core a.out *.old