diff --git a/newlib/libc/sys/jehanne/Makefile.am b/newlib/libc/sys/jehanne/Makefile.am
index 464c628c7..ae162f0aa 100644
--- a/newlib/libc/sys/jehanne/Makefile.am
+++ b/newlib/libc/sys/jehanne/Makefile.am
@@ -8,7 +8,7 @@ if MAY_SUPPLY_SYSCALLS
 extra_objs = syscalls.o libposix_conf.o chown.o getrusage.o ids.o \
 	chmod.o sigsets.o sigaction.o sigsuspend.o sigwaitinfo.o \
 	sigtimedwait.o sigwait.o alarm.o sigqueue.o siglongjmp.o \
-	termios.o ioctl.o
+	termios.o ioctl.o sysconf.o
 else
 extra_objs =
 endif
@@ -21,7 +21,7 @@ lib_a_LIBADD = $(extra_objs)
 EXTRA_lib_a_SOURCES = libposix_conf.c syscalls.c chown.c getrusage.c \
 	ids.c chmod.c sigsets.c sigaction.c sigsuspend.c sigwaitinfo.c \
 	sigtimedwait.c sigwait.c alarm.c sigqueue.c siglongjmp.c \
-	termios.c ioctl.c
+	termios.c ioctl.c sysconf.c
 lib_a_DEPENDENCIES = $(extra_objs)
 lib_a_CCASFLAGS = $(AM_CCASFLAGS)
 lib_a_CFLAGS = $(AM_CFLAGS)
diff --git a/newlib/libc/sys/jehanne/sysconf.c b/newlib/libc/sys/jehanne/sysconf.c
new file mode 100644
index 000000000..390596c78
--- /dev/null
+++ b/newlib/libc/sys/jehanne/sysconf.c
@@ -0,0 +1,25 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2019 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * Jehanne 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 Affero General Public License
+ * along with Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <errno.h>
+
+long sysconf(int name)
+{
+	/* TODO: implement. */
+	errno = ENOSYS;
+	return -1;
+}