Index: uspace/Makefile
===================================================================
--- uspace/Makefile	(revision d4c472baf92535da28ffed49127c8526791c168f)
+++ uspace/Makefile	(revision 2d2b8e6b1c94eb701f0f8602290e7e0aec5bf94e)
@@ -148,5 +148,6 @@
 	lib/drv \
 	lib/packet \
-	lib/net
+	lib/net \
+	lib/posix
 
 LIBC_BUILD = $(addsuffix .build,$(LIBC))
Index: uspace/Makefile.common
===================================================================
--- uspace/Makefile.common	(revision d4c472baf92535da28ffed49127c8526791c168f)
+++ uspace/Makefile.common	(revision 2d2b8e6b1c94eb701f0f8602290e7e0aec5bf94e)
@@ -44,4 +44,6 @@
 #   EXTRA_CLEAN        additional cleanup targets
 #
+#   POSIX_COMPAT       set to 'y' to use POSIX compatibility layer
+#
 # Optionally, for a binary:
 #   STATIC_NEEDED      set to 'y' for init binaries, will build statically
@@ -104,4 +106,6 @@
 LIBSOFTINT_PREFIX = $(LIB_PREFIX)/softint
 
+LIBPOSIX_PREFIX = $(LIB_PREFIX)/posix
+
 LIBBLOCK_PREFIX = $(LIB_PREFIX)/block
 LIBFS_PREFIX = $(LIB_PREFIX)/fs
@@ -197,21 +201,26 @@
 JOBFILE = $(LIBC_PREFIX)/../../../tools/jobfile.py
 
+ifeq ($(POSIX_COMPAT),y)
+	CFLAGS = -I$(LIBPOSIX_PREFIX)
+	LIBS += $(LIBPOSIX_PREFIX)/libposix.a
+endif
+
 ifeq ($(COMPILER),gcc_cross)
-	CFLAGS = $(GCC_CFLAGS) $(EXTRA_CFLAGS)
+	CFLAGS += $(GCC_CFLAGS) $(EXTRA_CFLAGS)
 	DEPEND_DEFS = $(DEFS) $(CONFIG_DEFS)
 endif
 
 ifeq ($(COMPILER),gcc_native)
-	CFLAGS = $(GCC_CFLAGS) $(EXTRA_CFLAGS)
+	CFLAGS += $(GCC_CFLAGS) $(EXTRA_CFLAGS)
 	DEPEND_DEFS = $(DEFS) $(CONFIG_DEFS)
 endif
 
 ifeq ($(COMPILER),icc)
-	CFLAGS = $(ICC_CFLAGS) $(EXTRA_CFLAGS)
+	CFLAGS += $(ICC_CFLAGS) $(EXTRA_CFLAGS)
 	DEPEND_DEFS = $(DEFS) $(CONFIG_DEFS)
 endif
 
 ifeq ($(COMPILER),clang)
-	CFLAGS = $(CLANG_CFLAGS) $(EXTRA_CFLAGS)
+	CFLAGS += $(CLANG_CFLAGS) $(EXTRA_CFLAGS)
 	DEPEND_DEFS = $(DEFS) $(CONFIG_DEFS)
 endif
Index: uspace/lib/posix/Makefile
===================================================================
--- uspace/lib/posix/Makefile	(revision 2d2b8e6b1c94eb701f0f8602290e7e0aec5bf94e)
+++ uspace/lib/posix/Makefile	(revision 2d2b8e6b1c94eb701f0f8602290e7e0aec5bf94e)
@@ -0,0 +1,36 @@
+#
+# Copyright (c) 2011 Petr Koupy
+# Copyright (c) 2011 Jiri Zarevucky
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# - The name of the author may not be used to endorse or promote products
+#   derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+USPACE_PREFIX = ../..
+LIBRARY = libposix
+
+SOURCES = \
+
+include $(USPACE_PREFIX)/Makefile.common
+