diff --git a/build.sh b/build.sh
index b34aea23..cdb0c628 100755
--- a/build.sh
+++ b/build.sh
@@ -1,35 +1,69 @@
 #! /bin/sh
 
+# Mes --- Maxwell Equations of Software
+# Copyright © 2017 Jan Nieuwenhuizen <janneke@gnu.org>
+#
+# This file is part of Mes.
+#
+# Mes is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or (at
+# your option) any later version.
+#
+# Mes is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Mes.  If not, see <http://www.gnu.org/licenses/>.
+
 set -ex
 
 HEX2=${HEX2-hex2}
 M1=${M1-M1}
+BLOOD_ELF=${BLOOD_ELF-blood-elf}
 MES_SEED=${MES_SEED-../mes-seed}
 
 $M1 --LittleEndian --Architecture=1\
     -f stage0/x86.M1\
     -f $MES_SEED/crt1.M1\
-    > crt1.hex2
+    -o crt1.hex2
 $M1 --LittleEndian --Architecture=1\
     -f stage0/x86.M1\
     -f $MES_SEED/libc-mes.M1\
-    > libc-mes.hex2
+    -o libc-mes.hex2
 $M1 --LittleEndian --Architecture=1\
     -f stage0/x86.M1\
     -f $MES_SEED/mes.M1\
-    > mes.hex2
+    -o mes.hex2
+$BLOOD_ELF\
+    -f stage0/x86.M1\
+    -f $MES_SEED/mes.M1\
+    -f $MES_SEED/libc-mes.M1\
+    -o mes-blood-elf-footer.M1
+$M1 --LittleEndian --Architecture=1\
+    -f mes-blood-elf-footer.M1\
+    -o mes-blood-elf-footer.hex2
 $HEX2 --LittleEndian --Architecture=1 --BaseAddress=0x1000000\
       -f stage0/elf32-header.hex2\
       -f crt1.hex2\
       -f libc-mes.hex2\
       -f mes.hex2\
-      -f stage0/elf32-footer-single-main.hex2\
-      > mes
-chmod +x mes
-
-#TODO: after building from seed, build from src/mes.c
+      -f mes-blood-elf-footer.hex2\
+      --exec_enable\
+      -o mes
 
 $M1 --LittleEndian --Architecture=1 -f\
     stage0/x86.M1\
     -f $MES_SEED/libc-mes+tcc.M1\
-    > libc-mes+tcc.hex2
+    -o libc-mes+tcc.hex2
+
+# TODO: after building from seed, build from src/mes.c
+# build-aux/mes-snarf.scm --mes src/gc.c
+# build-aux/mes-snarf.scm --mes src/lib.c
+# build-aux/mes-snarf.scm --mes src/math.c
+# build-aux/mes-snarf.scm --mes src/mes.c
+# build-aux/mes-snarf.scm --mes src/posix.c
+# build-aux/mes-snarf.scm --mes src/reader.c
+# build-aux/mes-snarf.scm --mes src/vector.c