diff --git a/src/kernel/libroot/posix/unistd/Jamfile b/src/kernel/libroot/posix/unistd/Jamfile
index 9929dec2c2..29d213effb 100644
--- a/src/kernel/libroot/posix/unistd/Jamfile
+++ b/src/kernel/libroot/posix/unistd/Jamfile
@@ -1,33 +1,36 @@
 SubDir OBOS_TOP src kernel libroot posix unistd ;
 
 KernelMergeObject posix_unistd.o :
-	<$(SOURCE_GRIST)>access.c
-	<$(SOURCE_GRIST)>chown.c
-	<$(SOURCE_GRIST)>close.c
-	<$(SOURCE_GRIST)>conf.c
-	<$(SOURCE_GRIST)>directory.c
-	<$(SOURCE_GRIST)>dup.c
-	<$(SOURCE_GRIST)>exec.c
-	<$(SOURCE_GRIST)>_exit.c
-	<$(SOURCE_GRIST)>fcntl.c
-	<$(SOURCE_GRIST)>fork.c
-	<$(SOURCE_GRIST)>getopt.c
-	<$(SOURCE_GRIST)>hostname.c
-	<$(SOURCE_GRIST)>ioctl.c
-	<$(SOURCE_GRIST)>link.c
-	<$(SOURCE_GRIST)>lseek.c
-	<$(SOURCE_GRIST)>mount.c
-	<$(SOURCE_GRIST)>open.c
-	<$(SOURCE_GRIST)>pipe.c
-	<$(SOURCE_GRIST)>process.c
-	<$(SOURCE_GRIST)>read.c
-	<$(SOURCE_GRIST)>sleep.c
-	<$(SOURCE_GRIST)>sync.c
-	<$(SOURCE_GRIST)>terminal.c
-	<$(SOURCE_GRIST)>truncate.c
-	<$(SOURCE_GRIST)>ttyname.c
-	<$(SOURCE_GRIST)>usergroup.c
-	<$(SOURCE_GRIST)>usleep.c
-	<$(SOURCE_GRIST)>write.c
+	access.c
+	alarm.c
+	chown.c
+	close.c
+	conf.c
+	directory.c
+	dup.c
+	exec.c
+	_exit.c
+	fcntl.c
+	fork.c
+	getopt.c
+	hostname.c
+	ioctl.c
+	link.c
+	lseek.c
+	mount.c
+	open.c
+	pipe.c
+	process.c
+	read.c
+	sbrk.c
+	sleep.c
+	sync.c
+	terminal.c
+	truncate.c
+	ttyname.c
+	ualarm.c
+	usergroup.c
+	usleep.c
+	write.c
 	: -fPIC -DPIC
 	;
diff --git a/src/kernel/libroot/posix/unistd/alarm.c b/src/kernel/libroot/posix/unistd/alarm.c
new file mode 100644
index 0000000000..ad54f459c2
--- /dev/null
+++ b/src/kernel/libroot/posix/unistd/alarm.c
@@ -0,0 +1,28 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <unistd.h>
+#include <syscalls.h>
+#include <errno.h>
+
+
+uint
+alarm(unsigned int sec)
+{
+	struct itimerval value, oldValue;
+
+	value.it_interval.tv_sec = value.it_interval.tv_usec = 0;
+	value.it_value.tv_sec = sec;
+	value.it_value.tv_usec = 0;
+	if (setitimer(ITIMER_REAL, &value, &oldValue) < 0)
+		return -1;
+
+	if (oldValue.it_value.tv_usec)
+		oldValue.it_value.tv_sec++;
+
+	return oldValue.it_value.tv_sec;
+}
+
diff --git a/src/kernel/libroot/posix/unistd/sbrk.c b/src/kernel/libroot/posix/unistd/sbrk.c
new file mode 100644
index 0000000000..c535268c6f
--- /dev/null
+++ b/src/kernel/libroot/posix/unistd/sbrk.c
@@ -0,0 +1,16 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <unistd.h>
+#include <errno.h>
+
+
+void *
+sbrk(long increment)
+{
+	// this function is no longer supported
+	return NULL;
+}
diff --git a/src/kernel/libroot/posix/unistd/ualarm.c b/src/kernel/libroot/posix/unistd/ualarm.c
new file mode 100644
index 0000000000..c82f8c7898
--- /dev/null
+++ b/src/kernel/libroot/posix/unistd/ualarm.c
@@ -0,0 +1,26 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <unistd.h>
+#include <syscalls.h>
+#include <errno.h>
+
+
+uint
+ualarm(uint usec, uint interval)
+{
+	struct itimerval value, oldValue;
+
+	value.it_value.tv_sec = 0;
+	value.it_value.tv_usec = usec;
+	value.it_interval.tv_sec = 0;
+	value.it_interval.tv_usec = interval;
+
+	if (setitimer(ITIMER_REAL, &value, &oldValue) < 0)
+		return -1;
+
+	return (oldValue.it_value.tv_sec * 1000000) + oldValue.it_value.tv_usec;
+}