--- a/aclocal.m4	Fri Oct 21 12:25:17 2005 +0000
+++ b/aclocal.m4	Fri Oct 21 12:30:29 2005 +0000
@@ -860,3 +860,57 @@
   AC_DEFINE(HAVE_IEEE754_DATA_FORMAT, 1, [Define if your system uses IEEE 754 data format.])
 fi
 ])
+dnl
+dnl Check for UMFPACK seperately split complex matrix and RHS. Note
+dnl that as umfpack.h can be in three different places, rather than
+dnl include it, just declare the functions needed.
+dnl
+dnl Assumes that
+dnl
+dnl   ACX_CHECK_HEADER_IN_DIRS(umfpack.h, [umfpack ufsparse])
+dnl
+dnl has already been called.
+dnl
+AC_DEFUN([OCTAVE_UMFPACK_SEPERATE_SPLIT],
+[AC_MSG_CHECKING([for UMFPACK seperate complex matrix and rhs split])
+AC_CACHE_VAL(octave_cv_umfpack_seperate_split,
+[AC_TRY_RUN([
+#include <stdlib.h>
+#include <$acx_umfpack_h_include_file>
+int n = 5;
+int Ap[] = {0, 2, 5, 9, 10, 12};
+int Ai[]  = {0, 1, 0, 2, 4, 1, 2, 3, 4, 2, 1, 4};
+double Ax[] = {2., 0., 3., 0., 3., 0., -1., 0., 4., 0., 4., 0., 
+	      -3., 0., 1., 0., 2., 0., 2., 0., 6., 0., 1., 0.};
+double br[] = {8., 45., -3., 3., 19.};
+double bi[] = {0., 0., 0., 0., 0.};
+int main (void)
+{
+  double *null = (double *) NULL ;
+  double *x = (double *)malloc (2 * n * sizeof(double));
+  int i ;
+  void *Symbolic, *Numeric ;
+  (void) umfpack_zi_symbolic (n, n, Ap, Ai, Ax, null, &Symbolic, null, null) ;
+  (void) umfpack_zi_numeric (Ap, Ai, Ax, null, Symbolic, &Numeric, null, null) ;
+  umfpack_zi_free_symbolic (&Symbolic) ;
+  (void) umfpack_zi_solve (0, Ap, Ai, Ax, null, x, null, br, bi, 
+		Numeric, null, null) ;
+  umfpack_zi_free_numeric (&Numeric) ;
+  for (i = 0; i < n; i++, x+=2) 
+    if (fabs(*x - i - 1.) > 1.e-13)
+      return (1);
+  return (0) ;
+}
+],
+  octave_cv_umfpack_seperate_split=yes,
+  octave_cv_umfpack_seperate_split=no,
+  octave_cv_umfpack_seperate_split=no)])
+if test "$cross_compiling" = yes; then
+  AC_MSG_RESULT([$octave_cv_umfpack_seperate_split assumed for cross compilation])
+else
+  AC_MSG_RESULT($octave_cv_umfpack_seperate_split)
+fi
+if test "$octave_cv_umfpack_seperate_split" = yes; then
+  AC_DEFINE(UMFPACK_SEPARATE_SPLIT, 1, [Define if the UMFPACK Complex solver allow matrix and RHS to be split independently])
+fi
+])

--- a/acx_include_dirs.m4	Fri Oct 21 12:25:17 2005 +0000
+++ b/acx_include_dirs.m4	Fri Oct 21 12:30:29 2005 +0000
@@ -6,7 +6,7 @@
 dnl
 dnl This macro requires autoconf 2.50 or later.
 dnl
-dnl @version $Id: acx_include_dirs.m4,v 1.2 2005-09-15 19:52:50 jwe Exp $
+dnl @version $Id: acx_include_dirs.m4,v 1.3 2005-10-21 12:30:29 jwe Exp $
 dnl @author David Bateman <dbateman@free.fr>
 dnl
 AC_DEFUN([ACX_CHECK_HEADER_IN_DIRS], [
@@ -26,10 +26,21 @@
 
 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
 if test x"$acx_include_ok" = xyes; then
-  acx_header=HEADER_`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
+  acx_header=HEADER_`echo $1 | sed -e 's/[[^a-zA-Z0-9_]]/_/g' \
     -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
-  ifelse([$3],,AC_DEFINE(${acx_header},$acx_include_dir/$1,[$5]),[$3])
+  acx_header_name_for_variable=`echo $1 | sed -e 's/[[^a-zA-Z0-9_]]/_/g'`
+  eval acx_${acx_header_name_for_variable}_include_dir=$acx_include_dir
+  if test -n "$acx_include_dir"; then
+    eval acx_${acx_header_name_for_variable}_include_file=$acx_include_dir/$1
+  else
+    eval acx_${acx_header_name_for_variable}_include_file=$1
+  fi
+  ifelse([$3],,AC_DEFINE(${acx_header},
+    [`eval echo '${'acx_${acx_header_name_for_variable}_include_file'}'`/$1],
+    [$5]),[$3])
+ifelse([$4],,,[
 else
   $4
+])
 fi
 ])dnl ACX_CHECK_HEADER_IN_DIRS

--- a/configure.in	Fri Oct 21 12:25:17 2005 +0000
+++ b/configure.in	Fri Oct 21 12:30:29 2005 +0000
@@ -29,7 +29,7 @@
 EXTERN_CXXFLAGS="$CXXFLAGS"
 
 AC_INIT
-AC_REVISION($Revision: 1.485 $)
+AC_REVISION($Revision: 1.486 $)
 AC_PREREQ(2.57)
 AC_CONFIG_SRCDIR([src/octave.cc])
 AC_CONFIG_HEADER(config.h)
@@ -755,21 +755,14 @@
               UMFPACK_LIBS="-lumfpack -lcblas"; with_umfpack=yes], [], $AMD_LIBS -lcblas $BLAS_LIBS)], $AMD_LIBS $BLAS_LIBS $FLIBS)], $AMD_LIBS)
 
     if test "$with_umfpack" = yes; then
-      # For now the code needed for this is not in umfpack, will add
-      # a test later that will probably have to be based on version
-      # numbers as there is no interface changes that are visible at
-      # compile time.
-      with_umfpack_split=no
-    fi
-
-    if test "$with_umfpack" = yes; then
       AC_DEFINE(HAVE_UMFPACK, 1, [Define if the UMFPACK library is used.])
       if test x"$acx_include_dir" != x; then
 	UMFPACK_INCLUDE=$acx_include_dir/umfpack.h
       fi
-      if test "$with_umfpack_split" = yes; then
-        AC_DEFINE(UMFPACK_SEPARATE_SPLIT, 1, [Define if the UMFPACK Complex solver allow matrix and RHS to be split independently])
-      fi
+      OLD_LIBS=$LIBS
+      LIBS="$LIBS $UMFPACK_LIBS $AMD_LIBS $BLAS_LIBS $FLIBS"
+      OCTAVE_UMFPACK_SEPERATE_SPLIT
+      LIBS=$OLD_LIBS
     else
       warn_umfpack="UMFPACK not found.  This will result in some lack of functionality for sparse matrices."
     fi],[