diff --git a/src/kernel/libroot/posix/sys/Jamfile b/src/kernel/libroot/posix/sys/Jamfile
index a33d5272ec..d9f6cd7492 100644
--- a/src/kernel/libroot/posix/sys/Jamfile
+++ b/src/kernel/libroot/posix/sys/Jamfile
@@ -1,12 +1,17 @@
 SubDir OBOS_TOP src kernel libroot posix sys ;
 
 KernelMergeObject posix_sys.o :
-	<$(SOURCE_GRIST)>chmod.c
-	<$(SOURCE_GRIST)>stat.c
-	<$(SOURCE_GRIST)>mkdir.c
- 	<$(SOURCE_GRIST)>select.c
- 	<$(SOURCE_GRIST)>sysctl.c
- 	<$(SOURCE_GRIST)>gettimeofday.c
- 	<$(SOURCE_GRIST)>wait.c
+	chmod.c
+	getrusage.c
+ 	gettimeofday.c
+	itimer.c
+	mkdir.c
+	mkfifo.c
+	rlimit.c
+ 	select.c
+	stat.c
+ 	sysctl.c
+ 	umask.c
+ 	wait.c
 	: -fPIC -DPIC
 	;
diff --git a/src/kernel/libroot/posix/sys/getrusage.c b/src/kernel/libroot/posix/sys/getrusage.c
new file mode 100644
index 0000000000..81f307cc25
--- /dev/null
+++ b/src/kernel/libroot/posix/sys/getrusage.c
@@ -0,0 +1,19 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <sys/resource.h>
+#include <syscalls.h>
+#include <errno.h>
+
+
+int
+getrusage(int who, struct rusage *rusage)
+{
+	// ToDo: implement me!
+	errno = B_BAD_VALUE;
+	return -1;
+}
+
diff --git a/src/kernel/libroot/posix/sys/itimer.c b/src/kernel/libroot/posix/sys/itimer.c
new file mode 100644
index 0000000000..bd72789f61
--- /dev/null
+++ b/src/kernel/libroot/posix/sys/itimer.c
@@ -0,0 +1,50 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <OS.h>
+
+#include <sys/time.h>
+#include <string.h>
+
+
+#define USEC_PER_SECOND 1000000
+
+
+int
+getitimer(int which, struct itimerval *value)
+{
+	// ToDo: implement me!
+	return -1;
+}
+
+
+int
+setitimer(int which, const struct itimerval *value, struct itimerval *oldValue)
+{
+	// ToDo: implement me properly!
+	// We probably need a better internal set_alarm() implementation to do this
+
+	bigtime_t interval = value->it_interval.tv_sec * USEC_PER_SECOND + value->it_interval.tv_usec;
+	if (interval != 0)
+		set_alarm(interval, B_PERIODIC_ALARM);
+	else {
+		bigtime_t timeout = value->it_value.tv_sec * USEC_PER_SECOND + value->it_value.tv_usec;
+		if (timeout != 0)
+			set_alarm(timeout, B_ONE_SHOT_RELATIVE_ALARM);
+		else {
+			// cancel alarm
+			set_alarm(B_INFINITE_TIMEOUT, B_PERIODIC_ALARM);
+		}
+	}
+
+	// whatever set_alarm() returns (not documented in the BeBook, and I haven't
+	// investigated this yet), maybe we can maintain the oldValue with it.
+
+	memset(oldValue, 0, sizeof(struct itimerval));
+
+	return 0;
+}
+
diff --git a/src/kernel/libroot/posix/sys/mkfifo.c b/src/kernel/libroot/posix/sys/mkfifo.c
new file mode 100644
index 0000000000..3b7c52e786
--- /dev/null
+++ b/src/kernel/libroot/posix/sys/mkfifo.c
@@ -0,0 +1,25 @@
+/* 
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <sys/stat.h>
+#include <syscalls.h>
+#include <errno.h>
+
+
+#define RETURN_AND_SET_ERRNO(err) \
+	if (err < 0) { \
+		errno = err; \
+		return -1; \
+	} \
+	return err;
+
+
+int
+mkfifo(const char *path, mode_t mode)
+{
+	// ToDo: implement me for real!
+	RETURN_AND_SET_ERRNO(B_BAD_VALUE);
+}
diff --git a/src/kernel/libroot/posix/sys/rlimit.c b/src/kernel/libroot/posix/sys/rlimit.c
new file mode 100644
index 0000000000..d759e39775
--- /dev/null
+++ b/src/kernel/libroot/posix/sys/rlimit.c
@@ -0,0 +1,36 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <sys/resource.h>
+#include <syscalls.h>
+#include <errno.h>
+
+
+#define RETURN_AND_SET_ERRNO(err) \
+	if (err < 0) { \
+		errno = err; \
+		return -1; \
+	} \
+	return err;
+
+
+int
+getrlimit(int resource, struct rlimit *rlimit)
+{
+	int status = _kern_getrlimit(resource, rlimit);
+
+	RETURN_AND_SET_ERRNO(status);
+}
+
+
+int
+setrlimit(int resource, const struct rlimit *rlimit)
+{
+	int status = _kern_setrlimit(resource, rlimit);
+
+	RETURN_AND_SET_ERRNO(status);
+}
+
diff --git a/src/kernel/libroot/posix/sys/umask.c b/src/kernel/libroot/posix/sys/umask.c
new file mode 100644
index 0000000000..9192f549aa
--- /dev/null
+++ b/src/kernel/libroot/posix/sys/umask.c
@@ -0,0 +1,24 @@
+/*
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <sys/stat.h>
+#include <syscalls.h>
+#include <errno.h>
+
+
+mode_t __gUmask = 022;
+	// this must be made available to open() and friends
+
+
+mode_t
+umask(mode_t newMask)
+{
+	mode_t oldMask = __gUmask;
+	__gUmask = newMask;
+
+	return oldMask;
+}
+