diff --git a/ChangeLog b/ChangeLog
index 0528aebe2..2d3d13910 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2004-09-06  Jochen Eisinger <jochen@penguin-breeder.org>
+
+	* backend/mustek_pp.c: clarify error message
+	* configure.in: only build the mustek_pp backend, if parallel
+	  port support of any kind is present
+
 2004-09-06  Gerhard Jaeger <gerhard@gjaeger.de>
 
 	* backend/plustek.c: Bumped build number.
diff --git a/backend/mustek_pp.c b/backend/mustek_pp.c
index 553dbb488..9cf54a429 100644
--- a/backend/mustek_pp.c
+++ b/backend/mustek_pp.c
@@ -671,7 +671,8 @@ attach_device(SANE_String *driver, SANE_String *name,
 
   if (found == 0)
     {
-      DBG (1, "sane_init: invalid driver name ``%s''\n", *driver);
+      DBG (1, "sane_init: no scanner detected\n");
+      DBG (3, "sane_init: either the driver name ``%s'' is invalid, or no scanner was detected\n", *driver);
     }
 
   free (*name);
diff --git a/configure.in b/configure.in
index 4b5a2598b..56b5b816f 100644
--- a/configure.in
+++ b/configure.in
@@ -296,7 +296,7 @@ else
     BACKENDS="abaton agfafocus apple artec as6e avision bh canon \
           canon630u coolscan coolscan2 dc25 dmc \
           epson fujitsu gt68xx hp leo matsushita microtek \
-          microtek2 mustek mustek_pp mustek_usb nec pie plustek \
+          microtek2 mustek mustek_usb nec pie plustek \
           plustek_pp ricoh s9036 sceptre sharp \
           sp15c st400 tamarack test teco1 teco2 teco3 umax umax_pp umax1220u \
           artec_eplus48u ma1509 ibm hp5400 u12 snapscan niash"
@@ -320,6 +320,14 @@ else
     BACKENDS="${BACKENDS} canon_pp hpsj5s"
   fi
 
+  if test "${sane_cv_use_libieee1284}" != "yes" && test "${enable_parport_directio}" != "yes"
+    then
+    echo "*** disabling MUSTEK_PP backend (failed to find libieee1284 library"
+    echo "***                              and parport-directio is disabled)"
+  else
+    BACKENDS="${BACKENDS} mustek_pp"
+  fi
+
   if test "${HAVE_GPHOTO2}" != "true" \
         -o "${sane_cv_use_libjpeg}" != "yes"; then
     echo "*** disabling GPHOTO2 backend (not requested, or failed to find required libraries)"