diff --git a/build-aux/bootstrap.sh.in b/build-aux/bootstrap.sh.in
index 1fbd38df..67d920dc 100644
--- a/build-aux/bootstrap.sh.in
+++ b/build-aux/bootstrap.sh.in
@@ -1,7 +1,7 @@
 #! @SHELL@
 
 # GNU Mes --- Maxwell Equations of Software
-# Copyright © 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# Copyright © 2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 #
 # This file is part of GNU Mes.
 #
@@ -18,6 +18,10 @@
 # You should have received a copy of the GNU General Public License
 # along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 
+if test "$V" = 1 -o "$V" = 2; then
+    set -x
+fi
+
 LANG=
 MES_ARENA=${MES_ARENA-20000000}
 export MES_ARENA
@@ -32,7 +36,8 @@ MES_PREFIX=${MES_PREFIX-$PWD}
 . ${srcdest}build-aux/cflags.sh
 
 CPPFLAGS="-D HAVE_CONFIG_H=1 -I include"
-AM_CFLAGS=""
+libdir=$PWD/lib
+export libdir
 mkdir -p mescc-lib
 cp config.sh mescc-lib/config.sh
 cd mescc-lib
@@ -41,6 +46,7 @@ ln -sf ${srcdest}mes .
 ln -sf ${srcdest}module .
 ln -sf ${srcdest}src .
 AM_CPPFLAGS="-D HAVE_CONFIG_H=1 -I ${srcdest}include -I ${srcdest}include/$mes_kernel/$mes_cpu"
+AM_CFLAGS="-L ${srcdest}lib"
 
 mkdir -p $mes_cpu-mes
 $CC -c $AM_CPPFLAGS $CPPFLAGS $AM_CFLAGS $CFLAGS ${srcdest}lib/$mes_kernel/$mes_cpu-mes-$compiler/crt1.c
@@ -59,6 +65,18 @@ done
 echo "  AR       $mes_cpu-mes/libc-mini.a"
 $AR crD $mes_cpu-mes/libc-mini.a $objects
 
+objects=
+for c in $libmescc_SOURCES; do
+    o=$(basename $c .c).o
+    if test ! -e $o -o ${srcdest}$c -nt $o; then
+        echo "  CC       $c"
+        $CC -c $AM_CPPFLAGS $CPPFLAGS $AM_CFLAGS $CFLAGS ${srcdest}$c
+    fi
+    objects="$objects $o"
+done
+echo "  AR       $mes_cpu-mes/libmescc.a"
+$AR crD $mes_cpu-mes/libmescc.a $objects
+
 objects=
 for c in $libc_SOURCES; do
     o=$(basename $c .c).o
@@ -86,6 +104,7 @@ $AR crD $mes_cpu-mes/libc+tcc.a $objects
 cd ..
 srcdest=
 CPPFLAGS="-D HAVE_CONFIG_H=1 -I ${srcdest}include -I ${srcdest}include/$mes_kernel/$mes_cpu"
+AM_CFLAGS="-L ${srcdest}lib"
 
 objects=
 for c in $mes_SOURCES; do
@@ -98,7 +117,7 @@ for c in $mes_SOURCES; do
 done
 echo "  CCLD     bin/mes-mescc"
 mkdir -p bin
-$CC -nostdlib -o bin/mes-mescc -L mescc-lib mescc-lib/crt1.o $objects -lc
+$CC $AM_CFLAGS -nostdlib -o bin/mes-mescc -L mescc-lib mescc-lib/crt1.o $objects -lc -lmescc
 cp bin/mes-mescc bin/mes
 
 (