diff --git a/components/SConscript b/components/SConscript
index 46ae96cfb354baebd43d63202684e1165474860e..538e976a52355069e8d93ec2a3e44a5aa9bea01c 100644
--- a/components/SConscript
+++ b/components/SConscript
@@ -22,7 +22,7 @@ if 'RT_USING_LWIP' in dir(rtconfig) and rtconfig.RT_USING_LWIP:
 	objs = objs + SConscript('net/lwip/SConscript')
 
 if 'RT_USING_MODBUS' in dir(rtconfig) and rtconfig.RT_USING_MODBUS:
-	objs = objs + SConscript('net//freemodbus/SConscript')
+	objs = objs + SConscript('net/freemodbus/SConscript')
 
 if 'RT_USING_RTGUI' in dir(rtconfig) and rtconfig.RT_USING_RTGUI:
 	objs = objs + SConscript('rtgui/SConscript')
@@ -30,6 +30,5 @@ if 'RT_USING_RTGUI' in dir(rtconfig) and rtconfig.RT_USING_RTGUI:
 # build each modules
 if rtconfig.CROSS_TOOL == 'gcc':
 	SConscript('hello/SConscript')
-	SConscript('thread/SConscript')
 
 Return('objs')
diff --git a/components/finsh/finsh.h b/components/finsh/finsh.h
index 1480af9bbd52e5610896b1691f7cc96b612004b7..575066e464050410faf4ba3dd05aaed79eebde6d 100644
--- a/components/finsh/finsh.h
+++ b/components/finsh/finsh.h
@@ -59,6 +59,7 @@
 /*@{*/
 
 #if defined(RT_USING_NEWLIB) || defined (RT_USING_MINILIBC)
+#include <sys/types.h>
 #include <string.h>
 #else
 typedef unsigned char  u_char;
diff --git a/components/libc/newlib/math.c b/components/libc/newlib/math.c
new file mode 100644
index 0000000000000000000000000000000000000000..d86abe58773d8a96403ad59c883556dbe8010cc2
--- /dev/null
+++ b/components/libc/newlib/math.c
@@ -0,0 +1,12 @@
+#include <math.h>
+
+/* Fix me */
+double sin(double x) 
+{
+	#warning sin function not supported for this platform
+}
+
+double cos(double x) 
+{
+	#warning cos function not supported for this platform
+}
diff --git a/components/libc/newlib/syscalls.c b/components/libc/newlib/syscalls.c
index 7768612da2cb118d365e64f092b8edf2f138940c..6204dafa1202c862f24a4c92c6c935df9978d6c3 100644
--- a/components/libc/newlib/syscalls.c
+++ b/components/libc/newlib/syscalls.c
@@ -1,8 +1,57 @@
 #include <reent.h>
+#include <sys/errno.h>
 
-int _fork_r (struct _reent *ptr)
+int _fork_r (struct _reent *r)
 {
 	/* return "not supported" */
-	ptr->errno = ENOTSUP;
+	r->_errno = ENOTSUP;
 	return -1;
 }
+
+_ssize_t
+_read_r (struct _reent *r, int fd, void *buf, size_t nbytes)
+{
+	_ssize_t rc;
+
+	rc = -1;
+
+	/* return "not supported" */
+	r->_errno = ENOTSUP;
+	return rc;
+}
+
+_ssize_t
+_write_r (struct _reent *r, int fd, const void *buf, size_t nbytes)
+{
+	_ssize_t rc;
+
+	rc = -1;
+
+	/* return "not supported" */
+	r->_errno = ENOTSUP;
+	return rc;
+}
+
+int
+_close_r (struct _reent *r, int fd)
+{
+	_ssize_t rc;
+
+	rc = -1;
+
+	/* return "not supported" */
+	r->_errno = ENOTSUP;
+	return rc;
+}
+
+_off_t
+_lseek_r (struct _reent *r, int fd,  _off_t offset, int whence)
+{
+	_ssize_t rc;
+
+	rc = -1;
+
+	/* return "not supported" */
+	r->_errno = ENOTSUP;
+	return rc;
+}