fix typo in regression Makefile.

src/test/regress/GNUmakefile

@@ -6,7 +6,7 @@
 # Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
 # Portions Copyright (c) 1994, Regents of the University of California
 #
-# $PostgreSQL: pgsql/src/test/regress/GNUmakefile,v 1.69 2007/09/09 20:40:54 adunstan Exp $
+# $PostgreSQL: pgsql/src/test/regress/GNUmakefile,v 1.70 2007/09/09 22:53:33 adunstan Exp $
 #
 #-------------------------------------------------------------------------
 
@@ -22,7 +22,7 @@ TEMP_PORT = 5$(DEF_PGPORT)
 # file with extra config for temp build
 TEMP_CONF =
 ifdef TEMP_CONFIG
-TEMP_CONF += --temp-config=S(TEMP_CONFIG)
+TEMP_CONF += --temp-config=$(TEMP_CONFIG)
 endif
 
 # where to find psql for testing an existing installation