diff --git a/src/kernel/libroot/posix/Jamfile b/src/kernel/libroot/posix/Jamfile
index 8bb51eb6e1..443f9aa2b4 100644
--- a/src/kernel/libroot/posix/Jamfile
+++ b/src/kernel/libroot/posix/Jamfile
@@ -8,6 +8,8 @@ KernelMergeObject posix_main.o :
  	errno.c
  	fnmatch.c
  	glob.c
+ 	grp.c
+ 	inttypes.c
  	poll.c
  	pwd.c
  	syslog.cpp
diff --git a/src/kernel/libroot/posix/grp.c b/src/kernel/libroot/posix/grp.c
new file mode 100644
index 0000000000..025a7c0bbf
--- /dev/null
+++ b/src/kernel/libroot/posix/grp.c
@@ -0,0 +1,121 @@
+/* 
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+/* Dumb group functions - only know the "users" group with group ID 0 right
+ * now - this should definitely be thought over :-)
+ */
+
+
+#include <SupportDefs.h>
+
+#include <grp.h>
+#include <string.h>
+
+
+static int32 sGroupIndex;
+static struct group sGroup;
+
+
+static void
+get_users(struct group *gr)
+{
+	static char *nothing = "";
+
+	gr->gr_name = "users";
+	gr->gr_passwd = NULL;
+	gr->gr_gid = 0;
+	gr->gr_mem = &nothing;
+}
+
+
+static void
+init_users()
+{
+	if (sGroupIndex == 0) {
+		// initial construction of the group
+		get_users(&sGroup);
+		sGroupIndex = 1;
+	}
+}
+
+
+struct group *
+getgrgid(gid_t gid)
+{
+	if (gid != 0)
+		return NULL;
+
+	init_users();
+	return &sGroup;
+}
+
+
+int
+getgrgid_r(gid_t gid, struct group *group, char *buffer,
+	size_t bufferSize, struct group **_result)
+{
+	if (gid != 0) {
+		*_result = NULL;
+		return B_ENTRY_NOT_FOUND;
+	}
+
+	get_users(group);
+	*_result = group;
+	return B_OK;
+}
+
+
+struct group *
+getgrnam(const char *name)
+{
+	if (strcmp("users", name))
+		return NULL;
+
+	init_users();
+	return &sGroup;
+}
+
+
+int
+getgrnam_r(const char *name, struct group *group, char *buffer,
+	size_t bufferSize, struct group **_result)
+{
+	if (strcmp("users", name)) {
+		*_result = NULL;
+		return B_ENTRY_NOT_FOUND;
+	}
+
+	get_users(group);
+	*_result = group;
+	return B_OK;
+}
+
+
+struct group *
+getgrent(void)
+{
+	if (sGroupIndex > 1)
+		return NULL;
+
+	init_users();
+	sGroupIndex++;
+
+	return &sGroup;
+}
+
+
+void
+setgrent(void)
+{
+	init_users();
+}
+
+
+void
+endgrent(void)
+{
+	init_users();
+}
+
diff --git a/src/kernel/libroot/posix/inttypes.c b/src/kernel/libroot/posix/inttypes.c
new file mode 100644
index 0000000000..711c02f7a6
--- /dev/null
+++ b/src/kernel/libroot/posix/inttypes.c
@@ -0,0 +1,49 @@
+/* 
+** Copyright 2004, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+** Distributed under the terms of the Haiku License.
+*/
+
+
+#include <inttypes.h>
+#include <stdlib.h>
+
+
+intmax_t
+imaxabs(intmax_t number)
+{
+	return number > 0 ? number : -number;
+}
+
+
+imaxdiv_t
+imaxdiv(intmax_t numer, intmax_t denom)
+{
+	imaxdiv_t result;
+
+	result.quot = numer / denom;
+	result.rem = numer % denom;
+
+	if (numer >= 0 && result.rem < 0) {
+		result.quot++;
+		result.rem -= denom;
+	}
+
+	return result;
+}
+
+
+intmax_t
+strtoimax(const char *string, char **_end, int base)
+{
+	// ToDo: implement me properly!
+	return (intmax_t)strtol(string, _end, base);
+}
+
+
+uintmax_t
+strtoumax(const char *string, char **_end, int base)
+{
+	// ToDo: implement me properly!
+	return (intmax_t)strtoul(string, _end, base);
+}
+