Fixup gssapi and db detection.

--- configure.orig	2021-03-11 13:20:59 UTC
+++ configure
@@ -17761,27 +17761,9 @@ done
 		# problems start to show up.
 		saved_libs="$LIBS"
 		for TRY_LIBS in \
-		    "-lgssapi_krb5" \
-		    "-lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err" \
-		    "-lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -lresolv" \
-		    "-lgssapi" \
-		    "-lgssapi -lkrb5 -ldes -lcrypt -lasn1 -lroken -lcom_err" \
-		    "-lgssapi -lkrb5 -lcrypt -lasn1 -lroken -lcom_err" \
-		    "-lgssapi -lkrb5 -lgssapi_krb5 -lcrypt -lasn1 -lroken -lcom_err" \
-		    "-lgssapi -lkrb5 -lhx509 -lcrypt -lasn1 -lroken -lcom_err" \
-		    "-lgss -lkrb5"
+		    "$($KRB5CONFIG gssapi --libs)"; \
 		do
-		    # Note that this does not include $saved_libs, because
-		    # on FreeBSD machines this configure script has added
-		    # -L/usr/local/lib to LIBS, which can make the
-		    # -lgssapi_krb5 test succeed with shared libraries even
-		    # when you are trying to build with KTH in /usr/lib.
-		    if test "/usr" = "$use_gssapi"
-		    then
-			    LIBS="$TRY_LIBS $ISC_OPENSSL_LIBS"
-		    else
-			    LIBS="-L$use_gssapi/lib $TRY_LIBS $ISC_OPENSSL_LIBS"
-		    fi
+		    LIBS="$TRY_LIBS"
 		    { $as_echo "$as_me:${as_lineno-$LINENO}: checking linking as $TRY_LIBS" >&5
 $as_echo_n "checking linking as $TRY_LIBS... " >&6; }
 		    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -17824,47 +17806,7 @@ $as_echo "no" >&6; } ;;
 		no) as_fn_error $? "could not determine proper GSSAPI linkage" "$LINENO" 5 ;;
 		esac
 
-		#
-		# XXXDCL Major kludge.  Tries to cope with KTH in /usr/lib
-		# but MIT in /usr/local/lib and trying to build with KTH.
-		# /usr/local/lib can end up earlier on the link lines.
-		# Like most kludges, this one is not only inelegant it
-		# is also likely to be the wrong thing to do at least as
-		# many times as it is the right thing.  Something better
-		# needs to be done.
-		#
-		if test "/usr" = "$use_gssapi" -a \
-			-f /usr/local/lib/libkrb5.a; then
-		    FIX_KTH_VS_MIT=yes
-		fi
-
-		case "$FIX_KTH_VS_MIT" in
-		yes)
-		    case "$enable_static_linking" in
-		    yes) gssapi_lib_suffix=".a"  ;;
-		    *)   gssapi_lib_suffix=".so" ;;
-		    esac
-
-		    for lib in $LIBS; do
-			case $lib in
-			-L*)
-			    ;;
-			-l*)
-			    new_lib=`echo $lib |
-				     sed -e s%^-l%$use_gssapi/lib/lib% \
-					 -e s%$%$gssapi_lib_suffix%`
-			    NEW_LIBS="$NEW_LIBS $new_lib"
-			    ;;
-			*)
-			   as_fn_error $? "KTH vs MIT Kerberos confusion!" "$LINENO" 5
-			    ;;
-			esac
-		    done
-		    LIBS="$NEW_LIBS"
-		    ;;
-		esac
-
-		DST_GSSAPI_INC="-I$use_gssapi/include"
+		DST_GSSAPI_INC="$($KRB5CONFIG gssapi --cflags)"
 		DNS_GSSAPI_LIBS="$LIBS"
 
 		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: using GSSAPI from $use_gssapi/lib and $use_gssapi/include" >&5
@@ -23263,7 +23205,7 @@ $as_echo "" >&6; }
 			# Check other locations for includes.
 			# Order is important (sigh).
 
-			bdb_incdirs="/db53 /db51 /db48 /db47 /db46 /db45 /db44 /db43 /db42 /db41 /db4 /db"
+			bdb_incdirs="/db6 /db5 /db48"
 			# include a blank element first
 			for d in "" $bdb_incdirs
 			do