diff --git a/bsp/asm9260t/rtconfig.py b/bsp/asm9260t/rtconfig.py
index 74b96338bbb7366f387cf89659caab02a0cbefcc..60d4f2051a87ad2b4e47bbe2ced3e968b9a3001d 100644
--- a/bsp/asm9260t/rtconfig.py
+++ b/bsp/asm9260t/rtconfig.py
@@ -11,10 +11,10 @@ if os.getenv('RTT_CC'):
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
    # EXEC_PATH  = 'D:/ArdaArmTools/Sourcery_Lite/bin'
-    EXEC_PATH   = 'D:/ArdaArmTools/GNUARM_4.9_2015q1/bin'
+    EXEC_PATH   = r'D:/ArdaArmTools/GNUARM_4.9_2015q1/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     PLATFORM    = 'iar'
     EXEC_PATH    = 'C:/Program Files (x86)/IAR Systems/Embedded Workbench 8.0'
diff --git a/bsp/efm32/rtconfig.py b/bsp/efm32/rtconfig.py
index d1a44f92894b0e45337cb3f005f0c4c00bd95c03..2f3ea1dfa3fa166884678442671bd9fbaac41b7e 100644
--- a/bsp/efm32/rtconfig.py
+++ b/bsp/efm32/rtconfig.py
@@ -10,7 +10,7 @@ if os.getenv('RTT_CC'):
 
 if CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:\Program Files (x86)\CodeSourcery\Sourcery G++ Lite\bin'
+    EXEC_PATH   = r'C:\Program Files (x86)\CodeSourcery\Sourcery G++ Lite\bin'
     #EXEC_PATH  = 'C:\Program Files (x86)\yagarto\bin'
 elif CROSS_TOOL == 'keil':
     print('================ERROR============================')
diff --git a/bsp/essemi/es32f0654/rtconfig.py b/bsp/essemi/es32f0654/rtconfig.py
index eb371bf3a7199a3b5530611d6fb7f0dc26bf5600..ed0d5930f08d952c7d73216ee5f55dc3d79cc9f9 100644
--- a/bsp/essemi/es32f0654/rtconfig.py
+++ b/bsp/essemi/es32f0654/rtconfig.py
@@ -15,15 +15,15 @@ CPU = 'cortex-m0'
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL  == 'gcc': # not support gcc yet
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:/GCC'
+    EXEC_PATH   = r'C:/GCC'
 
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil'
+    EXEC_PATH   = r'C:/Keil'
 
 elif CROSS_TOOL == 'iar': # not support iar yet
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/IAR'
+    EXEC_PATH   = r'C:/IAR'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/essemi/es32f365x/rtconfig.py b/bsp/essemi/es32f365x/rtconfig.py
index 69c567cc5cf81cee11639d9c21225bf9f9d7e531..133aa4372e792a74b8ae68f78761f3affb9dc375 100644
--- a/bsp/essemi/es32f365x/rtconfig.py
+++ b/bsp/essemi/es32f365x/rtconfig.py
@@ -15,15 +15,15 @@ CPU = 'cortex-m3'
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL  == 'gcc': # not support gcc yet
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:/GCC'
+    EXEC_PATH   = r'C:/GCC'
 
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil'
+    EXEC_PATH   = r'C:/Keil'
 
 elif CROSS_TOOL == 'iar': # not support iar yet
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/IAR'
+    EXEC_PATH   = r'C:/IAR'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/essemi/es32f369x/rtconfig.py b/bsp/essemi/es32f369x/rtconfig.py
index 69c567cc5cf81cee11639d9c21225bf9f9d7e531..133aa4372e792a74b8ae68f78761f3affb9dc375 100644
--- a/bsp/essemi/es32f369x/rtconfig.py
+++ b/bsp/essemi/es32f369x/rtconfig.py
@@ -15,15 +15,15 @@ CPU = 'cortex-m3'
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL  == 'gcc': # not support gcc yet
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:/GCC'
+    EXEC_PATH   = r'C:/GCC'
 
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil'
+    EXEC_PATH   = r'C:/Keil'
 
 elif CROSS_TOOL == 'iar': # not support iar yet
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/IAR'
+    EXEC_PATH   = r'C:/IAR'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/ft2004/rtconfig.py b/bsp/ft2004/rtconfig.py
index 13fed7d6f564c183d11fa4db32eee78e41b2aa56..cdbe7a28d3472ef8c3f819de51349e3b9198bacc 100644
--- a/bsp/ft2004/rtconfig.py
+++ b/bsp/ft2004/rtconfig.py
@@ -11,7 +11,7 @@ if os.getenv('RTT_CC'):
 
 # only support GNU GCC compiler.
 PLATFORM    = 'gcc'
-EXEC_PATH   = '/usr/lib/arm-none-eabi/bin'
+EXEC_PATH   = r'/usr/lib/arm-none-eabi/bin'
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
 
diff --git a/bsp/fujitsu/mb9x/mb9bf568r/rtconfig.py b/bsp/fujitsu/mb9x/mb9bf568r/rtconfig.py
index abee5014b253aff2a93b13bb7791c17aac72a94a..9f2625fd704cf858c8d94c8b1e211996ba224928 100644
--- a/bsp/fujitsu/mb9x/mb9bf568r/rtconfig.py
+++ b/bsp/fujitsu/mb9x/mb9bf568r/rtconfig.py
@@ -14,7 +14,7 @@ if  CROSS_TOOL == 'gcc':
     EXEC_PATH   = r'D:/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_MDK_471'
+    EXEC_PATH   = r'C:/Keil_MDK_471'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/imx6sx/cortex-a9/rtconfig.py b/bsp/imx6sx/cortex-a9/rtconfig.py
index 460ba8b2dda28ab53765477082462851189ea257..3832ca675b04bab47d0f6d3a9d0f1ed06cf37079 100644
--- a/bsp/imx6sx/cortex-a9/rtconfig.py
+++ b/bsp/imx6sx/cortex-a9/rtconfig.py
@@ -11,7 +11,7 @@ if os.getenv('RTT_CC'):
 if  CROSS_TOOL == 'gcc':
     PLATFORM 	= 'gcc'
     # EXEC_PATH 	= r'/opt/arm-2012.09/bin'
-    EXEC_PATH   = '/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'
+    EXEC_PATH   = r'/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM 	= 'armcc'
     EXEC_PATH 	= 'C:/Keil'
diff --git a/bsp/lpc54114-lite/rtconfig.py b/bsp/lpc54114-lite/rtconfig.py
index df13e9689b5a550c88993f11a1412a2b99159d30..dca2f52e79dd26c09e520e2fba95fcef74134f49 100644
--- a/bsp/lpc54114-lite/rtconfig.py
+++ b/bsp/lpc54114-lite/rtconfig.py
@@ -14,7 +14,7 @@ if  CROSS_TOOL == 'gcc':
     EXEC_PATH   = r'D:/Program Files/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'D:/Keil_v5'
+    EXEC_PATH   = r'D:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     PLATFORM    = 'iar'
     EXEC_PATH  = 'C:/Program Files (x86)/IAR Systems/Embedded Workbench 7.2'
diff --git a/bsp/lpc54608-LPCXpresso/rtconfig.py b/bsp/lpc54608-LPCXpresso/rtconfig.py
index a173ba28922bcf93e38ba607d1e0cc4f386a3c7c..c80ee443f1ed4dae5673b00a6807967a7998196e 100644
--- a/bsp/lpc54608-LPCXpresso/rtconfig.py
+++ b/bsp/lpc54608-LPCXpresso/rtconfig.py
@@ -14,7 +14,7 @@ if  CROSS_TOOL == 'gcc':
     EXEC_PATH   = r'D:/Program Files/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'D:/Keil_v5'
+    EXEC_PATH   = r'D:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/maxim/MAX32660_EVSYS/rtconfig.py b/bsp/maxim/MAX32660_EVSYS/rtconfig.py
index 48273268f4aa743bce189f6fbcadb1a246b27b16..dbb190a93da6ad4582ebe456886d3f03c3041162 100644
--- a/bsp/maxim/MAX32660_EVSYS/rtconfig.py
+++ b/bsp/maxim/MAX32660_EVSYS/rtconfig.py
@@ -16,7 +16,7 @@ if  CROSS_TOOL == 'gcc':
     EXEC_PATH   = r'.'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/nrf5x/libraries/templates/nrfx/rtconfig.py b/bsp/nrf5x/libraries/templates/nrfx/rtconfig.py
index c80981451603adbb7e436a0b2e5fa34ce60bbee2..315f21a833ddfee94ffe7498e46869ef62e9aee9 100644
--- a/bsp/nrf5x/libraries/templates/nrfx/rtconfig.py
+++ b/bsp/nrf5x/libraries/templates/nrfx/rtconfig.py
@@ -13,10 +13,10 @@ if os.getenv('RTT_CC'):
 
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'D:/SourceryGCC/bin'
+    EXEC_PATH   = r'D:/SourceryGCC/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/nrf5x/nrf51822/rtconfig.py b/bsp/nrf5x/nrf51822/rtconfig.py
index bfa1a160f12e69c398b1015d1dbf25f17e847797..1babbe9b5c52ae0f30a60bc74715faf0fa05e9b3 100644
--- a/bsp/nrf5x/nrf51822/rtconfig.py
+++ b/bsp/nrf5x/nrf51822/rtconfig.py
@@ -13,10 +13,10 @@ if os.getenv('RTT_CC'):
 
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'D:/SourceryGCC/bin'
+    EXEC_PATH   = r'D:/SourceryGCC/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/nrf5x/nrf52832/rtconfig.py b/bsp/nrf5x/nrf52832/rtconfig.py
index 805feeae5404cac5952a4510df6150f803e2df64..4db48a00bace1545733798280d5e7a0d6fdfcbb9 100644
--- a/bsp/nrf5x/nrf52832/rtconfig.py
+++ b/bsp/nrf5x/nrf52832/rtconfig.py
@@ -13,10 +13,10 @@ if os.getenv('RTT_CC'):
 
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'D:/SourceryGCC/bin'
+    EXEC_PATH   = r'D:/SourceryGCC/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/nrf5x/nrf52833/rtconfig.py b/bsp/nrf5x/nrf52833/rtconfig.py
index c80981451603adbb7e436a0b2e5fa34ce60bbee2..315f21a833ddfee94ffe7498e46869ef62e9aee9 100644
--- a/bsp/nrf5x/nrf52833/rtconfig.py
+++ b/bsp/nrf5x/nrf52833/rtconfig.py
@@ -13,10 +13,10 @@ if os.getenv('RTT_CC'):
 
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'D:/SourceryGCC/bin'
+    EXEC_PATH   = r'D:/SourceryGCC/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/nrf5x/nrf52840/rtconfig.py b/bsp/nrf5x/nrf52840/rtconfig.py
index c80981451603adbb7e436a0b2e5fa34ce60bbee2..315f21a833ddfee94ffe7498e46869ef62e9aee9 100644
--- a/bsp/nrf5x/nrf52840/rtconfig.py
+++ b/bsp/nrf5x/nrf52840/rtconfig.py
@@ -13,10 +13,10 @@ if os.getenv('RTT_CC'):
 
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'D:/SourceryGCC/bin'
+    EXEC_PATH   = r'D:/SourceryGCC/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     print('================ERROR============================')
     print('Not support iar yet!')
diff --git a/bsp/qemu-vexpress-a9/rtconfig.py b/bsp/qemu-vexpress-a9/rtconfig.py
index 49727b6d202b2f6aa78172cfa6c0fda7bcd6ca6a..edd1b6aab7f8bc0bf0be6fb6ecdb787dd96dfe25 100644
--- a/bsp/qemu-vexpress-a9/rtconfig.py
+++ b/bsp/qemu-vexpress-a9/rtconfig.py
@@ -35,7 +35,7 @@ if os.getenv('RTT_CC'):
 
 # only support GNU GCC compiler.
 PLATFORM    = 'gcc'
-EXEC_PATH   = '/usr/bin'
+EXEC_PATH   = r'/usr/bin'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/qemu-vexpress-gemini/rtconfig.py b/bsp/qemu-vexpress-gemini/rtconfig.py
index 462b218a2046a4e0f44412903563ae2791e72e7a..a7d31ae73e98a2e8d0767f02cac164add8150469 100644
--- a/bsp/qemu-vexpress-gemini/rtconfig.py
+++ b/bsp/qemu-vexpress-gemini/rtconfig.py
@@ -12,7 +12,7 @@ if  CROSS_TOOL == 'gcc':
     PLATFORM 	= 'gcc'
     # EXEC_PATH 	= r'/opt/arm-2012.09/bin'
     EXEC_PATH   = r'C:\Program Files (x86)\CodeSourcery\Sourcery_CodeBench_Lite_for_ARM_EABI\bin'
-    EXEC_PATH   = '/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'
+    EXEC_PATH   = r'/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/renesas/libraries/bsp-template/rtconfig.py b/bsp/renesas/libraries/bsp-template/rtconfig.py
index 956dda67c61c1bfd672f0483e5ee81354a0cf397..9a404b2dfaf306f01975502efa228196c517736c 100644
--- a/bsp/renesas/libraries/bsp-template/rtconfig.py
+++ b/bsp/renesas/libraries/bsp-template/rtconfig.py
@@ -15,13 +15,13 @@ if os.getenv('RTT_ROOT'):
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:\Users\XXYYZZ'
+    EXEC_PATH   = r'C:\Users\XXYYZZ'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armclang'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/Program Files/IAR Systems/Embedded Workbench 8.0'
+    EXEC_PATH   = r'C:/Program Files/IAR Systems/Embedded Workbench 8.0'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/renesas/ra6m4-cpk/rtconfig.py b/bsp/renesas/ra6m4-cpk/rtconfig.py
index c47800d8b0ff6431ae70c979bfc7fb025804af58..16968de0db2af7426db403c0c6397f23ffe2ad86 100644
--- a/bsp/renesas/ra6m4-cpk/rtconfig.py
+++ b/bsp/renesas/ra6m4-cpk/rtconfig.py
@@ -15,13 +15,13 @@ if os.getenv('RTT_ROOT'):
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:\Users\XXYYZZ'
+    EXEC_PATH   = r'C:\Users\XXYYZZ'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armclang'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/Program Files/IAR Systems/Embedded Workbench 8.0'
+    EXEC_PATH   = r'C:/Program Files/IAR Systems/Embedded Workbench 8.0'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/renesas/ra6m4-iot/rtconfig.py b/bsp/renesas/ra6m4-iot/rtconfig.py
index 956dda67c61c1bfd672f0483e5ee81354a0cf397..9a404b2dfaf306f01975502efa228196c517736c 100644
--- a/bsp/renesas/ra6m4-iot/rtconfig.py
+++ b/bsp/renesas/ra6m4-iot/rtconfig.py
@@ -15,13 +15,13 @@ if os.getenv('RTT_ROOT'):
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'C:\Users\XXYYZZ'
+    EXEC_PATH   = r'C:\Users\XXYYZZ'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armclang'
-    EXEC_PATH   = 'C:/Keil_v5'
+    EXEC_PATH   = r'C:/Keil_v5'
 elif CROSS_TOOL == 'iar':
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/Program Files/IAR Systems/Embedded Workbench 8.0'
+    EXEC_PATH   = r'C:/Program Files/IAR Systems/Embedded Workbench 8.0'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')
diff --git a/bsp/w60x/rtconfig.py b/bsp/w60x/rtconfig.py
index 61fa068b7c29bba16229152bc62ad4ad2ae2b232..254eb4fddcaeb11de0fb37f7c4d35957e5863246 100644
--- a/bsp/w60x/rtconfig.py
+++ b/bsp/w60x/rtconfig.py
@@ -15,13 +15,13 @@ if os.getenv('RTT_ROOT'):
 # EXEC_PATH is the compiler execute path, for example, CodeSourcery, Keil MDK, IAR
 if  CROSS_TOOL == 'gcc':
     PLATFORM    = 'gcc'
-    EXEC_PATH   = 'E:/tool/env/tools/gnu_gcc/arm_gcc/mingw/bin'
+    EXEC_PATH   = r'E:/tool/env/tools/gnu_gcc/arm_gcc/mingw/bin'
 elif CROSS_TOOL == 'keil':
     PLATFORM    = 'armcc'
-    EXEC_PATH   = 'C:/Keil'
+    EXEC_PATH   = r'C:/Keil'
 elif CROSS_TOOL == 'iar':
     PLATFORM    = 'iar'
-    EXEC_PATH   = 'C:/Program Files/IAR Systems/Embedded Workbench 6.0 Evaluation'
+    EXEC_PATH   = r'C:/Program Files/IAR Systems/Embedded Workbench 6.0 Evaluation'
 
 if os.getenv('RTT_EXEC_PATH'):
     EXEC_PATH = os.getenv('RTT_EXEC_PATH')