diff --git a/Build.sh b/Build.sh
index 78fe347..b0baa37 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.727 2017/08/29 13:38:28 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.728 2017/12/22 16:29:58 tg Exp $'
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #		2011, 2012, 2013, 2014, 2015, 2016, 2017
@@ -819,6 +819,21 @@ Interix)
 IRIX*)
 	: "${HAVE_SETLOCALE_CTYPE=0}"
 	;;
+Jehanne)
+	: "${HAVE_TERMIOS_H=1}"
+	: "${HAVE_GETRUSAGE=1}"
+	: "${LDSTATIC=-static}"
+	HAVE_ISSET_MKSH_ASSUME_UTF8=1
+	HAVE_ISOFF_MKSH_ASSUME_UTF8=0
+	add_cppflags -DMKSH_ASSUME_UTF8
+	add_cppflags -DMKSH_NO_CMDLINE_EDITING
+	add_cppflags -DMKSH_DISABLE_REVOKE_WARNING
+	add_cppflags '-D_PATH_DEFPATH=\"/cmd\"'
+	add_cppflags '-DMKSH_DEFAULT_EXECSHELL=\"/cmd/mksh\"'
+	add_cppflags '-DMKSH_DEFAULT_PROFILEDIR=\"/cfg/mksh\"'
+	add_cppflags '-DMKSH_ENVDIR=\"/env\"'
+	SRCS="$SRCS jehanne.c"
+	;;
 Linux)
 	case $CC in
 	*tendracc*) ;;
diff --git a/jehanne.c b/jehanne.c
new file mode 100644
index 0000000..ba0eb0f
--- /dev/null
+++ b/jehanne.c
@@ -0,0 +1,36 @@
+/*-
+ * Copyright (c) 2017
+ *	Giacomo Tesio <giacomo@tesio.it>
+ *
+ * Provided that these terms and disclaimer and all copyright notices
+ * are retained or reproduced in an accompanying document, permission
+ * is granted to deal in this work without restriction, including un-
+ * limited rights to use, publicly perform, distribute, sell, modify,
+ * merge, give away, or sublicence.
+ *
+ * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
+ * the utmost extent permitted by applicable law, neither express nor
+ * implied; without malicious intent or gross negligence. In no event
+ * may a licensor, author or contributor be held liable for indirect,
+ * direct, other damage, loss, or other issues arising in any way out
+ * of dealing in the work, even if advised of the possibility of such
+ * damage or existence of a defect, except proven that it results out
+ * of said person's immediate fault when using the work as intended.
+ *-
+ * Initialisation code for the Jehanne operating system (a Plan 9 de-
+ * rivative, using GCC)
+ */
+
+static const char __rcsid[] __attribute__((__used__)) =
+    "$MirOS: src/bin/mksh/jehanne.c,v 1.1 2017/12/22 16:30:00 tg Exp $";
+
+#include <u.h>
+#include <lib9.h>
+#include <posix.h>
+
+void
+__application_newlib_init(int argc, char *argv[])
+{
+	rfork(RFFDG | RFREND | RFNOTEG);
+	libposix_emulate_SIGCHLD();
+}