Taking a chance here. Under both Solaris and FreeBSD, there is a

scrappy · scrappy · commit f504e5a2532c · 1997-01-22T04:41:45.000Z
/usr/include/limits.h (which quiets the costsize.c warnings)...under
FreeBSD, /usr/include/limits.h *includes* machine/limits.h, while under
Solaris, there is no such things as /usr/include/machine...

Problem with Solaris pointed out by Mark Wahl
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/optimizer/path/costsize.c,v 1.9 1997/01/13 03:54:15 bryanh Exp $
+ *    $Header: /cvsroot/pgsql/src/backend/optimizer/path/costsize.c,v 1.10 1997/01/22 04:41:45 scrappy Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,7 +22,7 @@
 # define MAXINT        INT_MAX
 #else
 # if defined(USE_LIMITS_H)
-#  include <machine/limits.h>
+#  include <limits.h>
 #  define MAXINT	INT_MAX
 # else
 #  ifdef USE_VALUES_H
diff --git a/src/include/config.h b/src/include/config.h
@@ -98,6 +98,7 @@
 #endif
 
 #if defined(i386_solaris) 
+#  define USE_LIMITS_H
 #  define USE_POSIX_TIME 
 #  define USE_POSIX_SIGNALS
 #  define NEED_ISINF 
@@ -172,6 +173,7 @@
 #endif
 
 #if defined(sparc_solaris)
+#  define USE_LIMITS_H
 #  define USE_POSIX_TIME 
 #  define USE_POSIX_SIGNALS
 #  define NEED_ISINF 

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,7 @@`
`7`	`7`	`*`
`8`	`8`	`*`
`9`	`9`	`* IDENTIFICATION`
`10`		`- * $Header: /cvsroot/pgsql/src/backend/optimizer/path/costsize.c,v 1.9 1997/01/13 03:54:15 bryanh Exp $`
	`10`	`+ * $Header: /cvsroot/pgsql/src/backend/optimizer/path/costsize.c,v 1.10 1997/01/22 04:41:45 scrappy Exp $`
`11`	`11`	`*`
`12`	`12`	`*-------------------------------------------------------------------------`
`13`	`13`	`*/`
`@@ -22,7 +22,7 @@`
`22`	`22`	`# define MAXINT INT_MAX`
`23`	`23`	`#else`
`24`	`24`	`# if defined(USE_LIMITS_H)`
`25`		`-# include <machine/limits.h>`
	`25`	`+# include <limits.h>`
`26`	`26`	`# define MAXINT INT_MAX`
`27`	`27`	`# else`
`28`	`28`	`# ifdef USE_VALUES_H`