diff --git a/components/libc/Kconfig b/components/libc/Kconfig
index a2b8747ef6..04d59051b8 100644
--- a/components/libc/Kconfig
+++ b/components/libc/Kconfig
@@ -43,6 +43,20 @@ config RT_USING_POSIX
     default n
 
 if RT_USING_POSIX
+
+    config RT_USING_POSIX_POLL
+        bool "Enable poll()"
+        default n
+
+    config RT_USING_POSIX_SELECT
+        bool "Enable select()"
+        select RT_USING_POSIX_POLL
+        default n
+
+    config RT_USING_POSIX_GETLINE
+        bool "Enable getline()/getdelim() APIs"
+        default n
+
     config RT_USING_POSIX_MMAP
         bool "Enable mmap() API"
         default n
@@ -51,10 +65,6 @@ if RT_USING_POSIX
         bool "Enable termios APIs"
         default n
 
-    config RT_USING_POSIX_GETLINE
-        bool "Enable getline()/getdelim() APIs"
-        default n
-
     config RT_USING_POSIX_AIO
         bool "Enable AIO"
         default n
diff --git a/components/libc/posix/src/SConscript b/components/libc/posix/src/SConscript
index 8712d671c0..384e71261a 100644
--- a/components/libc/posix/src/SConscript
+++ b/components/libc/posix/src/SConscript
@@ -2,10 +2,16 @@
 
 from building import *
 
-src     = Glob('*.c')
+src     = ['libc.c','delay.c','unistd.c']
 cwd     = GetCurrentDir()
 CPPPATH = [cwd]
 
+if GetDepend('RT_USING_POSIX_POLL'):
+    src += ['poll.c']
+
+if GetDepend('RT_USING_POSIX_SELECT'):
+    src += ['select.c']
+
 group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX'], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/net/Kconfig b/components/net/Kconfig
index 4c49f4aa97..eaec96b931 100644
--- a/components/net/Kconfig
+++ b/components/net/Kconfig
@@ -42,6 +42,7 @@ config RT_USING_SAL
             bool "Enable BSD socket operated by file system API"
             default n
             select RT_LIBC_USING_FILEIO
+            select RT_USING_POSIX_SELECT
             help
                 Let BSD socket operated by file system API, such as read/write and involveed in select/poll POSIX APIs.