This subdirectory has been unused, dead, and broken for 10 years.

src/backend/port/sunos4/Makefile

-#-------------------------------------------------------------------------
-#
-# Makefile--
-#    Makefile for port/sunos4
-#
-# IDENTIFICATION
-#    $PostgreSQL: pgsql/src/backend/port/sunos4/Makefile,v 1.9 2007/01/20 17:16:12 petere Exp $
-#
-#-------------------------------------------------------------------------
-
-subdir = src/backend/port/sunos4
-top_builddir = ../../../..
-include $(top_builddir)/src/Makefile.global
-
-OBJS = strtol.o
-
-all: SUBSYS.o
-
-SUBSYS.o: $(OBJS)
-	$(LD) $(LDREL) $(LDOUT) SUBSYS.o $(OBJS)
-
-clean: 
-	rm -f SUBSYS.o $(OBJS)

src/backend/port/sunos4/float.h

-/*-------------------------------------------------------------------------
- *
- * float.h
- *	  definitions for ANSI floating point
- *
- *
- * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * $PostgreSQL: pgsql/src/backend/port/sunos4/float.h,v 1.17 2008/01/01 19:45:51 momjian Exp $
- *
- * NOTES
- *	  These come straight out of ANSI X3.159-1989 (p.18) and
- *	  would be unnecessary if SunOS 4 were ANSI-compliant.
- *
- *	  This is only a partial listing because I'm lazy to type
- *	  the whole thing in.
- *
- *-------------------------------------------------------------------------
- */
-#ifndef FLOAT_H
-#define FLOAT_H
-
-#define FLT_DIG 6
-#define FLT_MIN ((float) 1.17549435e-38)
-#define FLT_MAX ((float) 3.40282347e+38)
-#define DBL_DIG 15
-#define DBL_MIN 2.2250738585072014e-308
-#define DBL_MAX 1.7976931348623157e+308
-
-#endif   /* FLOAT_H */