--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2009-08-26  John W. Eaton  <jwe@octave.org>
+
+	* configure.in: Use OCTAVE_CHECK_LIBRARY to check for qrupdate.
+	* octave-bug.in, octave-bug.cc.in: Substitute QRUPDATE_CPPFLAGS and
+	QRUPDATE_LDFLAGS.
+	* Makeconf.in (QRUPDATE_CPPFLAGS, QRUPDATE_LDFLAGS): New variables.
+	(do-subst-config-vals): Substitute them.
+
 2009-08-26  John W. Eaton  <jwe@octave.org>
 
 	* octave-bug.in: Correct substitutions.

--- a/Makeconf.in
+++ b/Makeconf.in
@@ -289,7 +289,11 @@
 UMFPACK_LIBS = @UMFPACK_LIBS@
 
 OPENGL_LIBS = @OPENGL_LIBS@
+
+QRUPDATE_CPPFLAGS = @QRUPDATE_CPPFLAGS@
+QRUPDATE_LDFLAGS = @QRUPDATE_LDFLAGS@
 QRUPDATE_LIBS = @QRUPDATE_LIBS@
+
 READLINE_LIBS = @READLINE_LIBS@
 TERM_LIBS = @TERM_LIBS@
 
@@ -651,6 +655,8 @@
   -e "s|%OCTAVE_CONF_QHULL_CPPFLAGS%|\"${QHULL_CPPFLAGSS}\"|" \
   -e "s|%OCTAVE_CONF_QHULL_LDFLAGS%|\"${QHULL_LDFLAGSS}\"|" \
   -e "s|%OCTAVE_CONF_QHULL_LIBS%|\"${QHULL_LIBS}\"|" \
+  -e "s|%OCTAVE_CONF_QRUPDATE_CPPFLAGS%|\"${QRUPDATE_CPPFLAGS}\"|" \
+  -e "s|%OCTAVE_CONF_QRUPDATE_LDFLAGS%|\"${QRUPDATE_LDFLAGS}\"|" \
   -e "s|%OCTAVE_CONF_QRUPDATE_LIBS%|\"${QRUPDATE_LIBS}\"|" \
   -e "s|%OCTAVE_CONF_RANLIB%|\"${RANLIB}\"|" \
   -e "s|%OCTAVE_CONF_RDYNAMIC_FLAG%|\"${RDYNAMIC_FLAG}\"|" \

--- a/configure.in
+++ b/configure.in
@@ -813,33 +813,16 @@
   AC_MSG_WARN($warn_blas_f77_incompatible)
 fi
 
-QRUPDATE_LIBS=
-AC_SUBST(QRUPDATE_LIBS)
-
 # Check for the qrupdate library
-AC_ARG_WITH(qrupdate,
-  [AS_HELP_STRING([--without-qrupdate],
-     [don't use qrupdate, disable QR & Cholesky updating functions])],
-  with_qrupdate=$withval, with_qrupdate=yes)
 
-warn_qrupdate="qrupdate not found. The QR & Cholesky updating functions will be slow."
-if test "$with_qrupdate" = yes; then
-  with_qrupdate=no
-  if $have_fortran_compiler; then 
-    AC_F77_FUNC(sqr1up)
-  elif $have_f2c; then
-    sqr1up=sqr1up_
-  fi
-  AC_CHECK_LIB(qrupdate, $sqr1up, 
-    [QRUPDATE_LIBS="-lqrupdate"; with_qrupdate=yes], [], [$BLAS_LIBS $FLIBS])
-  if test "$with_qrupdate" = yes; then
-    AC_DEFINE(HAVE_QRUPDATE, 1, [Define if the qrupdate library is used.])
-    warn_qrupdate=
-  fi
-fi
-if test -n "$warn_qrupdate"; then
-  AC_MSG_WARN($warn_qrupdate)
-fi
+save_LIBS="$LIBS"
+LIBS="$BLAS_LIBS $FLIBS $LIBS"
+OCTAVE_CHECK_LIBRARY(qrupdate, qrupdate,
+  [qrupdate not found. The QR & Cholesky updating functions will be slow.],
+  [],
+  [F77_FUNC(sqr1up,SQR1UP)],
+  [], [don't use qrupdate, disable QR & Cholesky updating functions])
+LIBS="$save_LIBS"
 
 # Check for AMD library
 

--- a/octave-bug.cc.in
+++ b/octave-bug.cc.in
@@ -147,6 +147,8 @@
   vars["QHULL_CPPFLAGS"] = %OCTAVE_CONF_QHULL_CPPFLAGS%;
   vars["QHULL_LDFLAGS"] = %OCTAVE_CONF_QHULL_LDFLAGS%;
   vars["QHULL_LIBS"] = %OCTAVE_CONF_QHULL_LIBS%;
+  vars["QRUPDATE_CPPFLAGS"] = %OCTAVE_CONF_QRUPDATE_CPPFLAGS%;
+  vars["QRUPDATE_LDFLAGS"] = %OCTAVE_CONF_QRUPDATE_LDFLAGS%;
   vars["QRUPDATE_LIBS"] = %OCTAVE_CONF_QRUPDATE_LIBS%;
   vars["READLINE_LIBS"] = %OCTAVE_CONF_READLINE_LIBS%;
   vars["REGEX_LIBS"] = %OCTAVE_CONF_REGEX_LIBS%;

--- a/octave-bug.in
+++ b/octave-bug.in
@@ -99,6 +99,8 @@
 QHULL_CPPFLAGS=%OCTAVE_CONF_QHULL_CPPFLAGS%
 QHULL_LDFLAGS=%OCTAVE_CONF_QHULL_LDFLAGS%
 QHULL_LIBS=%OCTAVE_CONF_QHULL_LIBS%
+QRUPDATE_CPPFLAGS=%OCTAVE_CONF_QRUPDATE_CPPFLAGS%
+QRUPDATE_LDFLAGS=%OCTAVE_CONF_QRUPDATE_LDFLAGS%
 QRUPDATE_LIBS=%OCTAVE_CONF_QRUPDATE_LIBS%
 READLINE_LIBS=%OCTAVE_CONF_READLINE_LIBS%
 REGEX_LIBS=%OCTAVE_CONF_REGEX_LIBS%

--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2009-08-26  John W. Eaton  <jwe@octave.org>
+
+	* oct-conf.h.in: New defines for QRUPDATE_CPPFLAGS and QRUPDATE_LDFLAGS.
+	* toplev.cc (octave_config_info): Include them in the list.
+
 2009-08-26  John W. Eaton  <jwe@octave.org>
 
 	* oct-conf.h.in: New defines for ARPACK_CPPFLAGS and ARPACK_LDFLAGS.

--- a/src/oct-conf.h.in
+++ b/src/oct-conf.h.in
@@ -413,6 +413,14 @@
 #define OCTAVE_CONF_QHULL_LIBS %OCTAVE_CONF_QHULL_LIBS%
 #endif
 
+#ifndef OCTAVE_CONF_QRUPDATE_CPPFLAGS
+#define OCTAVE_CONF_QRUPDATE_CPPFLAGS %OCTAVE_CONF_QRUPDATE_CPPFLAGS%
+#endif
+
+#ifndef OCTAVE_CONF_QRUPDATE_LDFLAGS
+#define OCTAVE_CONF_QRUPDATE_LDFLAGS %OCTAVE_CONF_QRUPDATE_LDFLAGS%
+#endif
+
 #ifndef OCTAVE_CONF_QRUPDATE_LIBS
 #define OCTAVE_CONF_QRUPDATE_LIBS %OCTAVE_CONF_QRUPDATE_LIBS%
 #endif

--- a/src/toplev.cc
+++ b/src/toplev.cc
@@ -1284,6 +1284,8 @@
       { false, "QHULL_CPPFLAGS", OCTAVE_CONF_QHULL_CPPFLAGS },
       { false, "QHULL_LDFLAGS", OCTAVE_CONF_QHULL_LDFLAGS },
       { false, "QHULL_LIBS", OCTAVE_CONF_QHULL_LIBS },
+      { false, "QRUPDATE_CPPFLAGS", OCTAVE_CONF_QRUPDATE_CPPFLAGS },
+      { false, "QRUPDATE_LDFLAGS", OCTAVE_CONF_QRUPDATE_LDFLAGS },
       { false, "QRUPDATE_LIBS", OCTAVE_CONF_QRUPDATE_LIBS },
       { false, "RANLIB", OCTAVE_CONF_RANLIB },
       { false, "RDYNAMIC_FLAG", OCTAVE_CONF_RDYNAMIC_FLAG },