isinf() doesn't exist under i386_solaris, so code it such that

it is (!isnan() && !finite()) instead

src/backend/port/Makefile.in

@@ -13,7 +13,7 @@
 # be converted to Method 2.  
 #
 # IDENTIFICATION
-#    $Header: /cvsroot/pgsql/src/backend/port/Attic/Makefile.in,v 1.13 1998/01/13 15:31:09 scrappy Exp $
+#    $Header: /cvsroot/pgsql/src/backend/port/Attic/Makefile.in,v 1.14 1998/01/13 19:21:40 scrappy Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -25,7 +25,7 @@ INCLUDE_OPT = -I..
 CFLAGS+= ${INCLUDE_OPT}
 
 OBJS = dynloader.o @INET_ATON@ @STRERROR@ @MISSING_RANDOM@ @SRANDOM@
-OBJS+= @GETHOSTNAME@ @GETRUSAGE@ @STRCASECMP@ @STRDUP@ @TAS@
+OBJS+= @GETHOSTNAME@ @GETRUSAGE@ @STRCASECMP@ @STRDUP@ @TAS@ @ISINF@
 
 all: SUBSYS.o
 

src/configure.in

@@ -461,8 +461,11 @@ AC_PROG_GCC_TRADITIONAL
 AC_FUNC_MEMCMP
 AC_TYPE_SIGNAL
 AC_FUNC_VPRINTF
-AC_CHECK_FUNCS(isinf tzset vfork memmove sigsetjmp kill sysconf)
+AC_CHECK_FUNCS(tzset vfork memmove sigsetjmp kill sysconf)
 AC_CHECK_FUNCS(sigprocmask waitpid setsid fcvt)
+AC_CHECK_FUNC(isinf, 
+              AC_DEFINE(HAVE_ISINF), 
+              ISINF='isinf.o')
 AC_CHECK_FUNC(getrusage, 
               AC_DEFINE(HAVE_GETRUSAGE), 
               GETRUSAGE='getrusage.o')