diff --git a/libcpu/SConscript b/libcpu/SConscript
index 774e7f4043f2ef28c194d2aa63604437c76e6329..6092707e6d618f914a94adb652dfb286281725d2 100644
--- a/libcpu/SConscript
+++ b/libcpu/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 if rtconfig.ARCH in list:
-    group = group + SConscript(os.path.join(cwd, rtconfig.ARCH, 'SConscript'))
+    group = group + SConscript(os.path.join(rtconfig.ARCH, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/arc/SConscript b/libcpu/arc/SConscript
index cbec0b5ec1c52c83668862d388b538605cf1f4eb..3c69b578fa34b23cedf9b300c4a0570cec1a980a 100644
--- a/libcpu/arc/SConscript
+++ b/libcpu/arc/SConscript
@@ -9,9 +9,9 @@ cwd   = GetCurrentDir()
 group = []
 
 # add common code files
-group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+group = group + SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/arm/SConscript b/libcpu/arm/SConscript
index 36a214327b7407cb4830ddafe26e4f72b65fd1c0..f6ea13fb9103047533f76bc65e62c5b89c6e9642 100644
--- a/libcpu/arm/SConscript
+++ b/libcpu/arm/SConscript
@@ -5,14 +5,12 @@ from building import *
 
 Import('rtconfig')
 
-cwd   = GetCurrentDir()
-group = []
-list  = os.listdir(cwd)
+cwd = GetCurrentDir()
 
 # add common code files
-group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+group = SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/avr32/SConscript b/libcpu/avr32/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/avr32/SConscript
+++ b/libcpu/avr32/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/blackfin/SConscript b/libcpu/blackfin/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/blackfin/SConscript
+++ b/libcpu/blackfin/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/c-sky/SConscript b/libcpu/c-sky/SConscript
index 36a214327b7407cb4830ddafe26e4f72b65fd1c0..640e46a4fb16a375760be5f213a5840bdf0ac46d 100644
--- a/libcpu/c-sky/SConscript
+++ b/libcpu/c-sky/SConscript
@@ -10,9 +10,9 @@ group = []
 list  = os.listdir(cwd)
 
 # add common code files
-group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+group = group + SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/m16c/SConscript b/libcpu/m16c/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/m16c/SConscript
+++ b/libcpu/m16c/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/mips/SConscript b/libcpu/mips/SConscript
index 36a214327b7407cb4830ddafe26e4f72b65fd1c0..640e46a4fb16a375760be5f213a5840bdf0ac46d 100644
--- a/libcpu/mips/SConscript
+++ b/libcpu/mips/SConscript
@@ -10,9 +10,9 @@ group = []
 list  = os.listdir(cwd)
 
 # add common code files
-group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+group = group + SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/nios/SConscript b/libcpu/nios/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/nios/SConscript
+++ b/libcpu/nios/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/ppc/SConscript b/libcpu/ppc/SConscript
index 36a214327b7407cb4830ddafe26e4f72b65fd1c0..640e46a4fb16a375760be5f213a5840bdf0ac46d 100644
--- a/libcpu/ppc/SConscript
+++ b/libcpu/ppc/SConscript
@@ -10,9 +10,9 @@ group = []
 list  = os.listdir(cwd)
 
 # add common code files
-group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+group = group + SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/risc-v/SConscript b/libcpu/risc-v/SConscript
index 36a214327b7407cb4830ddafe26e4f72b65fd1c0..640e46a4fb16a375760be5f213a5840bdf0ac46d 100644
--- a/libcpu/risc-v/SConscript
+++ b/libcpu/risc-v/SConscript
@@ -10,9 +10,9 @@ group = []
 list  = os.listdir(cwd)
 
 # add common code files
-group = group + SConscript(os.path.join(cwd, 'common', 'SConscript'))
+group = group + SConscript(os.path.join('common', 'SConscript'))
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/sim/SConscript b/libcpu/sim/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/sim/SConscript
+++ b/libcpu/sim/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/ti-dsp/SConscript b/libcpu/ti-dsp/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/ti-dsp/SConscript
+++ b/libcpu/ti-dsp/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/unicore32/SConscript b/libcpu/unicore32/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/unicore32/SConscript
+++ b/libcpu/unicore32/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/v850/SConscript b/libcpu/v850/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/v850/SConscript
+++ b/libcpu/v850/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')
diff --git a/libcpu/xilinx/SConscript b/libcpu/xilinx/SConscript
index ebdd1357ee1ee74658f8daad9721f87d0d14b82b..4f1441895c0480d4a7c8b5aa63d74d7bf053155e 100644
--- a/libcpu/xilinx/SConscript
+++ b/libcpu/xilinx/SConscript
@@ -10,6 +10,6 @@ group = []
 list  = os.listdir(cwd)
 
 # cpu porting code files
-group = group + SConscript(os.path.join(cwd, rtconfig.CPU, 'SConscript'))
+group = group + SConscript(os.path.join(rtconfig.CPU, 'SConscript'))
 
 Return('group')