diff -Naur octave-forge-2006.03.17/configure octave-forge-2006.03.17.new/configure
--- octave-forge-2006.03.17/configure	2006-03-17 00:26:16.000000000 -0500
+++ octave-forge-2006.03.17.new/configure	2007-04-13 08:47:33.000000000 -0400
@@ -4493,7 +4493,7 @@
 
 echo "$as_me:$LINENO: checking for autoload in Octave" >&5
 echo $ECHO_N "checking for autoload in Octave... $ECHO_C" >&6
-if test `echo 'disp(exist("autoload"))' | $OCTAVE -qf`X != 0X ; then
+if test `echo 'disp(exist("autoload"))' | $OCTAVE -qf`X != `echo 'disp(0)' | $OCTAVE -qf`X ; then
    echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
 
@@ -4517,7 +4517,7 @@
 
 echo "$as_me:$LINENO: checking for do_fortran_indexing in Octave" >&5
 echo $ECHO_N "checking for do_fortran_indexing in Octave... $ECHO_C" >&6
-if test `echo 'disp(exist("do_fortran_indexing"))' | $OCTAVE -qf`X != 0X ; then
+if test `echo 'disp(exist("do_fortran_indexing"))' | $OCTAVE -qf`X != `echo 'disp(0)' | $OCTAVE -qf`X ; then
    echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
    HAVE_DO_FORTRAN_INDEXING="-DHAVE_DO_FORTRAN_INDEXING"
@@ -4531,7 +4531,7 @@
 
 echo "$as_me:$LINENO: checking for propagate_empty_matrices in Octave" >&5
 echo $ECHO_N "checking for propagate_empty_matrices in Octave... $ECHO_C" >&6
-if test `echo 'disp(exist("propagate_empty_matrices"))' | $OCTAVE -qf`X != 0X ; then
+if test `echo 'disp(exist("propagate_empty_matrices"))' | $OCTAVE -qf`X != `echo 'disp(0)' | $OCTAVE -qf`X ; then
    echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
    PROPAGATE_EMPTY_MATRICES="-DHAVE_PROPAGATE_EMPTY_MATRICES"
@@ -4545,7 +4545,7 @@
 
 echo "$as_me:$LINENO: checking for ok_to_lose_imaginary_part in Octave" >&5
 echo $ECHO_N "checking for ok_to_lose_imaginary_part in Octave... $ECHO_C" >&6
-if test `echo 'disp(exist("ok_to_lose_imaginary_part"))' | $OCTAVE -qf`X != 0X ; then
+if test `echo 'disp(exist("ok_to_lose_imaginary_part"))' | $OCTAVE -qf`X != `echo 'disp(0)' | $OCTAVE -qf`X ; then
    echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
    HAVE_OK_TO_LOSE_IMAGINARY_PART="-DHAVE_OK_TO_LOSE_IMAGINARY_PART"
@@ -4582,7 +4582,7 @@
 
 echo "$as_me:$LINENO: checking for class in Octave" >&5
 echo $ECHO_N "checking for class in Octave... $ECHO_C" >&6
-if test `echo 'disp(exist("class"))' | $OCTAVE -qf`X != 0X ; then
+if test `echo 'disp(exist("class"))' | $OCTAVE -qf`X != `echo 'disp(0)' | $OCTAVE -qf`X ; then
    echo "$as_me:$LINENO: result: yes" >&5
 echo "${ECHO_T}yes" >&6
    TYPEID_HAS_CLASS="-DTYPEID_HAS_CLASS"
diff -Naur octave-forge-2006.03.17/configure.base octave-forge-2006.03.17.new/configure.base
--- octave-forge-2006.03.17/configure.base	2006-01-07 00:11:56.000000000 -0500
+++ octave-forge-2006.03.17.new/configure.base	2007-04-13 08:47:33.000000000 -0400
@@ -276,7 +276,7 @@
 dnl
 AC_DEFUN(OCTAVE_CHECK_EXIST,
 [AC_MSG_CHECKING([for $1 in Octave])
-if test `echo 'disp(exist("$1"))' | $OCTAVE -qf`X != 0X ; then
+if test `echo 'disp(exist("$1"))' | $OCTAVE -qf`X != `echo 'disp(0)' | $OCTAVE -qf`X ; then
    AC_MSG_RESULT(yes)
    $2
 else