diff --git a/configure b/configure
index c85bd42c6..c5407e0a9 100755
--- a/configure
+++ b/configure
@@ -1134,7 +1134,7 @@ ac_abs_top_srcdir=`cd "$ac_dir" && cd $ac_top_srcdir && pwd`
     else
       echo "$as_me: WARNING: no configuration information is in $ac_dir" >&2
     fi
-    cd "$ac_popdir"
+    cd $ac_popdir
   done
 fi
 
@@ -1333,7 +1333,7 @@ _ASBOX
       echo "$as_me: caught signal $ac_signal"
     echo "$as_me: exit $exit_status"
   } >&5
-  rm -f core *.core &&
+  rm -f core core.* *.core &&
   rm -rf conftest* confdefs* conf$$* $ac_clean_files &&
     exit $exit_status
      ' 0
@@ -2395,7 +2395,8 @@ if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; }; then
   for ac_declaration in \
-   '' \
+   ''\
+   '#include <stdlib.h>' \
    'extern "C" void std::exit (int) throw (); using std::exit;' \
    'extern "C" void std::exit (int); using std::exit;' \
    'extern "C" void exit (int) throw ();' \
@@ -2409,8 +2410,8 @@ _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-$ac_declaration
 #include <stdlib.h>
+$ac_declaration
 int
 main ()
 {
@@ -3494,7 +3495,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 ( exit $ac_status )
 ac_cv_header_stdc=no
 fi
-rm -f core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+rm -f core core.* *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
 fi
 fi
 fi
@@ -6069,7 +6070,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 ( exit $ac_status )
 ac_cv_header_stdc=no
 fi
-rm -f core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+rm -f core core.* *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
 fi
 fi
 fi
@@ -7481,7 +7482,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 ( exit $ac_status )
 ac_cv_c_bigendian=yes
 fi
-rm -f core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+rm -f core core.* *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
 fi
 fi
 rm -f conftest.$ac_objext conftest.$ac_ext
@@ -7972,7 +7973,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 ( exit $ac_status )
 ac_cv_c_stack_direction=-1
 fi
-rm -f core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+rm -f core core.* *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
 fi
 fi
 echo "$as_me:$LINENO: result: $ac_cv_c_stack_direction" >&5
@@ -8374,7 +8375,7 @@ sed 's/^/| /' conftest.$ac_ext >&5
 ( exit $ac_status )
 ac_cv_func_mmap_fixed_mapped=no
 fi
-rm -f core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+rm -f core core.* *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
 fi
 fi
 echo "$as_me:$LINENO: result: $ac_cv_func_mmap_fixed_mapped" >&5
@@ -9460,7 +9461,7 @@ ia64-*-hpux*)
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 9463 "configure"' > conftest.$ac_ext
+  echo '#line 9464 "configure"' > conftest.$ac_ext
   if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -10222,7 +10223,8 @@ else
   fi
 fi
 for ac_declaration in \
-   '' \
+   ''\
+   '#include <stdlib.h>' \
    'extern "C" void std::exit (int) throw (); using std::exit;' \
    'extern "C" void std::exit (int); using std::exit;' \
    'extern "C" void exit (int) throw ();' \
@@ -10236,8 +10238,8 @@ _ACEOF
 cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
-$ac_declaration
 #include <stdlib.h>
+$ac_declaration
 int
 main ()
 {
@@ -10638,7 +10640,7 @@ fi
 
 
 # Provide some information about the compiler.
-echo "$as_me:10641:" \
+echo "$as_me:10643:" \
      "checking for Fortran 77 compiler version" >&5
 ac_compiler=`set X $ac_compile; echo $2`
 { (eval echo "$as_me:$LINENO: \"$ac_compiler --version </dev/null >&5\"") >&5
@@ -11643,11 +11645,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:11646: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:11648: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:11650: \$? = $ac_status" >&5
+   echo "$as_me:11652: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -11875,11 +11877,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:11878: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:11880: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:11882: \$? = $ac_status" >&5
+   echo "$as_me:11884: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -11942,11 +11944,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:11945: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:11947: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:11949: \$? = $ac_status" >&5
+   echo "$as_me:11951: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -13954,7 +13956,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 13957 "configure"
+#line 13959 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14052,7 +14054,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 14055 "configure"
+#line 14057 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16184,11 +16186,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16187: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16189: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:16191: \$? = $ac_status" >&5
+   echo "$as_me:16193: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -16251,11 +16253,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16254: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16256: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:16258: \$? = $ac_status" >&5
+   echo "$as_me:16260: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -17494,7 +17496,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 17497 "configure"
+#line 17499 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -17592,7 +17594,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 17595 "configure"
+#line 17597 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18414,11 +18416,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:18417: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:18419: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:18421: \$? = $ac_status" >&5
+   echo "$as_me:18423: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -18481,11 +18483,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:18484: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:18486: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:18488: \$? = $ac_status" >&5
+   echo "$as_me:18490: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -20421,11 +20423,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:20424: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:20426: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:20428: \$? = $ac_status" >&5
+   echo "$as_me:20430: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -20653,11 +20655,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:20656: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:20658: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:20660: \$? = $ac_status" >&5
+   echo "$as_me:20662: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -20720,11 +20722,11 @@ else
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:20723: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:20725: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:20727: \$? = $ac_status" >&5
+   echo "$as_me:20729: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -22732,7 +22734,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 22735 "configure"
+#line 22737 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -22830,7 +22832,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 22833 "configure"
+#line 22835 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -23871,7 +23873,7 @@ echo "$as_me: Manually selected backends: ${BACKENDS}" >&6;}
           microtek2 mustek mustek_pp 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"
+          artec_eplus48u ma1509 ibm hp5400 u12"
 
   if test "${sane_cv_use_libjpeg}" != "yes"; then
     echo "*** disabling DC210 backend (failed to find JPEG library)"
diff --git a/configure.in b/configure.in
index fcf5b3179..6b48bddd5 100644
--- a/configure.in
+++ b/configure.in
@@ -289,7 +289,7 @@ else
           microtek2 mustek mustek_pp 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"
+          artec_eplus48u ma1509 ibm hp5400 u12"
 
   if test "${sane_cv_use_libjpeg}" != "yes"; then
     echo "*** disabling DC210 backend (failed to find JPEG library)"