--- a/configure.in
+++ b/configure.in
@@ -21,7 +21,7 @@
 dnl along with Octave; see the file COPYING.  If not, write to the Free
 dnl Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 dnl
-AC_REVISION($Revision: 1.38 $)dnl
+AC_REVISION($Revision: 1.39 $)dnl
 AC_PREREQ(1.8)dnl
 AC_INIT(src/octave.cc)
 AC_CONFIG_HEADER(config.h)
@@ -205,7 +205,7 @@
   2.*)
     CFLAGS="-g -O"
     AC_VERBOSE([setting CFLAGS to $CFLAGS])
-    LDFLAGS="-g -O"
+    LDFLAGS="-g"
     AC_VERBOSE([setting LDFLAGS to $LDFLAGS])
     ADD_CC_WALL=true
   ;;
@@ -412,7 +412,7 @@
 dnl
 AC_HAVE_FUNCS(setvbuf getcwd gethostname bzero rindex vfprintf vsprintf)dnl
 AC_HAVE_FUNCS(stricmp strnicmp strcasecmp strncasecmp strerror)dnl
-AC_HAVE_FUNCS(atexit on_exit)dnl
+AC_HAVE_FUNCS(atexit on_exit mktemp)dnl
 dnl
 dnl Check to see if we have IEEE math functions, and if so, which ones.
 dnl
@@ -452,6 +452,7 @@
 done
 dnl
 AC_HAVE_FUNCS(infinity quiet_nan)dnl
+AC_HAVE_FUNCS(erf erfc lgamma)dnl
 dnl
 CFLAGS="$XCFLAGS"
 dnl