--- configure.ac.original	2005-02-20 16:52:41.000000000 -0800
+++ configure.ac	2005-02-20 16:57:39.000000000 -0800
@@ -163,6 +163,8 @@
 dnl Custom checks
 
 AC_MSG_CHECKING(whether snprintf is C99 conformant)
+if test "x$CONF_SNPRINTF_TYPE" = "x"
+then
 AC_TRY_RUN([
 #include <stdio.h>
 #ifdef STDC_HEADERS
@@ -194,6 +196,7 @@
 else
   AC_DEFINE_UNQUOTED(CONF_SNPRINTF_TYPE, $CONF_SNPRINTF_TYPE, [return value of an overflowed snprintf])
 fi
+fi
 
 dnl Options