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diff -ru /home/christof/pgsql-cvs/pgsql/src/backend/utils/adt/float.c pgsql/src/backend/utils/adt/float.c
--- /home/christof/pgsql-cvs/pgsql/src/backend/utils/adt/float.c	Mon Sep 27 10:07:29 1999
+++ pgsql/src/backend/utils/adt/float.c	Fri Oct  1 11:49:32 1999
@@ -1157,11 +1157,11 @@
 
 	tmp1 = *arg1;
 	tmp2 = *arg2;
-#ifndef finite
+#ifndef HAVE_FINITE
 	errno = 0;
 #endif
 	*result = (float64data) pow(tmp1, tmp2);
-#ifndef finite
+#ifndef HAVE_FINITE
 	if (errno != 0)				/* on some machines both EDOM & ERANGE can
 								 * occur */
 #else
@@ -1189,11 +1189,11 @@
 	result = (float64) palloc(sizeof(float64data));
 
 	tmp = *arg1;
-#ifndef finite
+#ifndef HAVE_FINITE
 	errno = 0;
 #endif
 	*result = (float64data) exp(tmp);
-#ifndef finite
+#ifndef HAVE_FINITE
 	if (errno == ERANGE)
 #else
 	/* infinity implies overflow, zero implies underflow */
diff -ru /home/christof/pgsql-cvs/pgsql/src/configure.in pgsql/src/configure.in
--- /home/christof/pgsql-cvs/pgsql/src/configure.in	Mon Sep 13 08:44:37 1999
+++ pgsql/src/configure.in	Fri Oct  1 11:39:25 1999
@@ -769,6 +769,12 @@
 	      AC_DEFINE(HAVE_RINT),
 	      AC_CHECK_LIB(m, rint, AC_DEFINE(HAVE_RINT), , $HPUXMATHLIB))
 
+AC_MSG_CHECKING(for finite() macro or function)
+AC_TRY_LINK([#include <math.h>],
+	[int dummy=finite(1.0);],
+	[AC_DEFINE(HAVE_FINITE) AC_MSG_RESULT(yes)],
+	AC_MSG_RESULT(no))
+
 dnl Check to see if we have a working 64-bit integer type.
 dnl This breaks down into two steps:
 dnl (1) figure out if the compiler has a 64-bit int type with working
diff -ru /home/christof/pgsql-cvs/pgsql/src/include/config.h.in pgsql/src/include/config.h.in
--- /home/christof/pgsql-cvs/pgsql/src/include/config.h.in	Mon Sep 13 08:44:38 1999
+++ pgsql/src/include/config.h.in	Fri Oct  1 11:46:23 1999
@@ -359,6 +359,9 @@
 /* Set to 1 if you have rint() */
 #undef HAVE_RINT 
 
+/* Set to 1 if you have finite() */
+#undef HAVE_FINITE
+
 /* Set to 1 if you have memmove() */
 #undef HAVE_MEMMOVE