diff --git a/components/libc/posix/io/epoll/SConscript b/components/libc/posix/io/epoll/SConscript
index cef3fff8a0..c1b6166874 100644
--- a/components/libc/posix/io/epoll/SConscript
+++ b/components/libc/posix/io/epoll/SConscript
@@ -3,12 +3,8 @@
 from building import *
 
 cwd     = GetCurrentDir()
-src     = []
-CPPPATH = [cwd]
+src     = ['epoll.c']
 
-if GetDepend('RT_USING_POSIX_EPOLL'):
-    src += ['epoll.c']
-
-group = DefineGroup('POSIX', src, depend = [''], CPPPATH = CPPPATH)
+group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX_EPOLL'])
 
 Return('group')
diff --git a/components/libc/posix/io/eventfd/SConscript b/components/libc/posix/io/eventfd/SConscript
index b4becfce4b..84275acdbb 100644
--- a/components/libc/posix/io/eventfd/SConscript
+++ b/components/libc/posix/io/eventfd/SConscript
@@ -3,12 +3,9 @@
 from building import *
 
 cwd     = GetCurrentDir()
-src     = []
+src     = ['eventfd.c']
 CPPPATH = [cwd]
 
-if GetDepend('RT_USING_POSIX_EVENTFD'):
-    src += ['eventfd.c']
-
-group = DefineGroup('POSIX', src, depend = [''], CPPPATH = CPPPATH)
+group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX_EVENTFD'], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/libc/posix/io/signalfd/SConscript b/components/libc/posix/io/signalfd/SConscript
index 724453b099..7803331b15 100644
--- a/components/libc/posix/io/signalfd/SConscript
+++ b/components/libc/posix/io/signalfd/SConscript
@@ -3,12 +3,8 @@
 from building import *
 
 cwd     = GetCurrentDir()
-src     = []
-CPPPATH = [cwd]
+src     = ['signalfd.c']
 
-if GetDepend('RT_USING_POSIX_SIGNALFD'):
-    src += ['signalfd.c']
-
-group = DefineGroup('POSIX', src, depend = ['RT_USING_SMART','RT_USING_POSIX_SIGNALFD'], CPPPATH = CPPPATH)
+group = DefineGroup('POSIX', src, depend = ['RT_USING_SMART','RT_USING_POSIX_SIGNALFD'])
 
 Return('group')
diff --git a/components/libc/posix/io/timerfd/SConscript b/components/libc/posix/io/timerfd/SConscript
index 561d00c13c..be123dfdff 100644
--- a/components/libc/posix/io/timerfd/SConscript
+++ b/components/libc/posix/io/timerfd/SConscript
@@ -3,12 +3,8 @@
 from building import *
 
 cwd     = GetCurrentDir()
-src     = []
-CPPPATH = [cwd]
+src     = ['timerfd.c']
 
-if GetDepend('RT_USING_DFS'):
-    src += ['timerfd.c']
-
-group = DefineGroup('POSIX', src, depend = ['RT_USING_POSIX_TIMERFD'], CPPPATH = CPPPATH)
+group = DefineGroup('POSIX', src, depend = ['RT_USING_DFS', 'RT_USING_POSIX_TIMERFD'])
 
 Return('group')