--- test/dotest.orig	2013-02-12 19:30:10.000000000 +0100
+++ test/dotest	2014-09-11 05:58:19.000000000 +0200
@@ -31,6 +31,17 @@
     keepgoing=1
 fi
 
+
+compare() {
+ answer=`pamarith -compare "$1" "$2" 2>&1`
+ result=$?
+ if [ ! $result -eq 0 ]; then
+  echo "$answer"
+ fi
+ return $result
+}
+
+
 failed() {
     if (( lastfailed != totaltests ))
     then
@@ -126,9 +137,9 @@
     source="$1"
     shift
     testrun ${XCFTOOLS_PREFIX}xcf2pnm \
-        -@ -oo.$oext $aopt source/$source.xcf.gz "$@"
-    [ -z "$oanswer" ] || cmp o.want o.$oext || failed
-    [ -z "$aanswer" ] || cmp a.want a.pnm || failed
+        -oo.$oext $aopt source/$source.xcf.gz "$@"
+    [ -z "$oanswer" ] || compare o.want o.$oext || failed
+    [ -z "$aanswer" ] || compare a.want a.pnm || failed
 }
 
 testpng() {
@@ -162,10 +173,10 @@
     perl pngtype.pl < o.png > pngtype
     diff -u pngtype.want pngtype || failed
     pngtopnm $oargs o.png > o.pnm
-    cmp o.want o.pnm || failed
+    compare o.want o.pnm || failed
     if [ "$afilter" != : ] ; then
         pngtopnm -alpha o.png > a.pnm
-        cmp a.want a.pnm || failed
+        compare a.want a.pnm || failed
     fi
     rm pngtype.want
 }
@@ -732,4 +743,4 @@
     exit 0
 fi
 
-# End
\ No newline at end of file
+# End