diff --git a/cf/krb-ipv6.m4 b/cf/krb-ipv6.m4
index a148ffc00..6d4ed79ef 100644
--- a/cf/krb-ipv6.m4
+++ b/cf/krb-ipv6.m4
@@ -8,7 +8,85 @@ AC_ARG_WITH(ipv6,
 if test "$withval" = "no"; then
 	ac_cv_lib_ipv6=no
 fi])
-AC_CACHE_CHECK(for IPv6,ac_cv_lib_ipv6,
+AC_CACHE_VAL(ac_cv_lib_ipv6,
+[dnl check for different v6 implementations (by itojun)
+v6type=unknown
+v6lib=none
+
+AC_MSG_CHECKING([ipv6 stack type])
+for i in v6d toshiba kame inria zeta linux; do
+	case $i in
+	v6d)
+		AC_EGREP_CPP(yes, [dnl
+#include </usr/local/v6/include/sys/types.h>
+#ifdef __V6D__
+yes
+#endif],
+			[v6type=$i; v6lib=v6;
+			v6libdir=/usr/local/v6/lib;
+			CFLAGS="-I/usr/local/v6/include $CFLAGS"])
+		;;
+	toshiba)
+		AC_EGREP_CPP(yes, [dnl
+#include <sys/param.h>
+#ifdef _TOSHIBA_INET6
+yes
+#endif],
+			[v6type=$i; v6lib=inet6;
+			v6libdir=/usr/local/v6/lib;
+			CFLAGS="-DINET6 $CFLAGS"])
+		;;
+	kame)
+		AC_EGREP_CPP(yes, [dnl
+#include <netinet/in.h>
+#ifdef __KAME__
+yes
+#endif],
+			[v6type=$i; v6lib=inet6;
+			v6libdir=/usr/local/v6/lib;
+			CFLAGS="-DINET6 $CFLAGS"])
+		;;
+	inria)
+		AC_EGREP_CPP(yes, [dnl
+#include <netinet/in.h>
+#ifdef IPV6_INRIA_VERSION
+yes
+#endif],
+			[v6type=$i; CFLAGS="-DINET6 $CFLAGS"])
+		;;
+	zeta)
+		AC_EGREP_CPP(yes, [dnl
+#include <sys/param.h>
+#ifdef _ZETA_MINAMI_INET6
+yes
+#endif],
+			[v6type=$i; v6lib=inet6;
+			v6libdir=/usr/local/v6/lib;
+			CFLAGS="-DINET6 $CFLAGS"])
+		;;
+	linux)
+		if test -d /usr/inet6; then
+			v6type=$i
+			v6lib=inet6
+			v6libdir=/usr/inet6
+			CFLAGS="-DINET6 $CFLAGS"
+		fi
+		;;
+	esac
+	if test "$v6type" != "unknown"; then
+		break
+	fi
+done
+AC_MSG_RESULT($v6type)
+
+if test "$v6lib" != "none"; then
+	for dir in $v6libdir /usr/local/v6/lib /usr/local/lib; do
+		if test -d $dir -a -f $dir/lib$v6lib.a; then
+			LIBS="-L$dir -l$v6lib $LIBS"
+			break
+		fi
+	done
+fi
 AC_TRY_LINK([
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
@@ -35,94 +113,10 @@ AC_TRY_LINK([
  bind(s, (struct sockaddr *)&sin6, sizeof(sin6));
 ],
 ac_cv_lib_ipv6=yes,
-ac_cv_lib_ipv6=no))
+ac_cv_lib_ipv6=no)])
+AC_MSG_CHECKING(for IPv6)
+AC_MSG_RESULT($ac_cv_lib_ipv6)
 if test "$ac_cv_lib_ipv6" = yes; then
   AC_DEFINE(HAVE_IPV6, 1, [Define if you have IPv6.])
-
-	dnl check for different v6 implementations (by itojun)
-	v6type=unknown
-	v6lib=none
-
-	AC_MSG_CHECKING([ipv6 stack type])
-	for i in v6d toshiba kame inria zeta linux; do
-		case $i in
-		v6d)
-			AC_EGREP_CPP(yes, [dnl
-#include </usr/local/v6/include/sys/types.h>
-#ifdef __V6D__
-yes
-#endif],
-				[v6type=$i; v6lib=v6;
-				v6libdir=/usr/local/v6/lib;
-				CFLAGS="-I/usr/local/v6/include $CFLAGS"])
-			;;
-		toshiba)
-			AC_EGREP_CPP(yes, [dnl
-#include <sys/param.h>
-#ifdef _TOSHIBA_INET6
-yes
-#endif],
-				[v6type=$i; v6lib=inet6;
-				v6libdir=/usr/local/v6/lib;
-				CFLAGS="-DINET6 $CFLAGS"])
-			;;
-		kame)
-			AC_EGREP_CPP(yes, [dnl
-#include <netinet/in.h>
-#ifdef __KAME__
-yes
-#endif],
-				[v6type=$i; v6lib=inet6;
-				v6libdir=/usr/local/v6/lib;
-				CFLAGS="-DINET6 $CFLAGS"])
-			;;
-		inria)
-			AC_EGREP_CPP(yes, [dnl
-#include <netinet/in.h>
-#ifdef IPV6_INRIA_VERSION
-yes
-#endif],
-				[v6type=$i; CFLAGS="-DINET6 $CFLAGS"])
-			;;
-		zeta)
-			AC_EGREP_CPP(yes, [dnl
-#include <sys/param.h>
-#ifdef _ZETA_MINAMI_INET6
-yes
-#endif],
-				[v6type=$i; v6lib=inet6;
-				v6libdir=/usr/local/v6/lib;
-				CFLAGS="-DINET6 $CFLAGS"])
-			;;
-		linux)
-			if test -d /usr/inet6; then
-				v6type=$i
-				v6lib=inet6
-				v6libdir=/usr/inet6
-				CFLAGS="-DINET6 $CFLAGS"
-			fi
-			;;
-		esac
-		if test "$v6type" != "unknown"; then
-			break
-		fi
-	done
-	AC_MSG_RESULT($v6type)
-
-	if test "$v6lib" != "none"; then
-		for dir in $v6libdir /usr/local/v6/lib /usr/local/lib; do
-			if test -d $dir -a -f $dir/lib$v6lib.a; then
-				LIBS="-L$dir -l$v6lib $LIBS"
-				break
-			fi
-		done
-dnl		AC_CHECK_LIB($v6lib, getaddrinfo,
-dnl			[SERVER_LIBS="-l$v6lib $SERVER_LIBS"],
-dnl			[dnl
-dnl			echo "Fatal: no $v6lib library found.  cannot continue."
-dnl			echo "You need to fetch lib$v6lib.a from appropriate v6 kit and"
-dnl			echo 'compile beforehand.'
-dnl			exit 1])
-	fi
 fi
 ])