This could be what's missing on some systems.

Michael Meskes · Michael Meskes · commit f06a2b0eccf5 · 2007-10-03T14:42:16.000Z
diff --git a/src/interfaces/ecpg/compatlib/Makefile b/src/interfaces/ecpg/compatlib/Makefile
@@ -4,7 +4,7 @@
 #
 # Copyright (c) 1994, Regents of the University of California
 #
-# $PostgreSQL: pgsql/src/interfaces/ecpg/compatlib/Makefile,v 1.30 2007/10/03 13:40:52 meskes Exp $
+# $PostgreSQL: pgsql/src/interfaces/ecpg/compatlib/Makefile,v 1.31 2007/10/03 14:42:16 meskes Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -37,6 +37,9 @@ all: all-lib
 # Shared library stuff
 include $(top_srcdir)/src/Makefile.shlib
 
+snprintf.c: $(top_srcdir)/src/port/%
+	rm -f $@ && $(LN_S) $< .
+
 # We need several not-quite-identical variants of .DEF files to build libecpg
 # DLLs for Windows.  These are made from the single source file exports.txt.
 # Since we can't assume that Windows boxes will have sed, the .DEF files are

Original file line number	Diff line number	Diff line change
`@@ -4,7 +4,7 @@`
`4`	`4`	`#`
`5`	`5`	`# Copyright (c) 1994, Regents of the University of California`
`6`	`6`	`#`
`7`		`-# $PostgreSQL: pgsql/src/interfaces/ecpg/compatlib/Makefile,v 1.30 2007/10/03 13:40:52 meskes Exp $`
	`7`	`+# $PostgreSQL: pgsql/src/interfaces/ecpg/compatlib/Makefile,v 1.31 2007/10/03 14:42:16 meskes Exp $`
`8`	`8`	`#`
`9`	`9`	`#-------------------------------------------------------------------------`
`10`	`10`
`@@ -37,6 +37,9 @@ all: all-lib`
`37`	`37`	`# Shared library stuff`
`38`	`38`	`include $(top_srcdir)/src/Makefile.shlib`
`39`	`39`
	`40`	`+snprintf.c: $(top_srcdir)/src/port/%`
	`41`	`+ rm -f $@ && $(LN_S) $< .`
	`42`	`+`
`40`	`43`	`# We need several not-quite-identical variants of .DEF files to build libecpg`
`41`	`44`	`# DLLs for Windows. These are made from the single source file exports.txt.`
`42`	`45`	`# Since we can't assume that Windows boxes will have sed, the .DEF files are`