diff --git a/BaseTools/BinWrappers/PosixLike/BPDG b/BaseTools/BinWrappers/PosixLike/BPDG
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/BPDG
+++ b/BaseTools/BinWrappers/PosixLike/BPDG
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/Ecc b/BaseTools/BinWrappers/PosixLike/Ecc
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/Ecc
+++ b/BaseTools/BinWrappers/PosixLike/Ecc
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/GenDepex b/BaseTools/BinWrappers/PosixLike/GenDepex
index bdb6722a1f..dad174788b 100755
--- a/BaseTools/BinWrappers/PosixLike/GenDepex
+++ b/BaseTools/BinWrappers/PosixLike/GenDepex
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/AutoGen/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/GenFds b/BaseTools/BinWrappers/PosixLike/GenFds
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/GenFds
+++ b/BaseTools/BinWrappers/PosixLike/GenFds
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable b/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable
+++ b/BaseTools/BinWrappers/PosixLike/GenPatchPcdTable
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/PatchPcdValue b/BaseTools/BinWrappers/PosixLike/PatchPcdValue
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/PatchPcdValue
+++ b/BaseTools/BinWrappers/PosixLike/PatchPcdValue
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/Pkcs7Sign b/BaseTools/BinWrappers/PosixLike/Pkcs7Sign
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/Pkcs7Sign
+++ b/BaseTools/BinWrappers/PosixLike/Pkcs7Sign
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys
index 2cddde9d4f..1bc1054a34 100755
--- a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys
+++ b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256GenerateKeys
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/Rsa2048Sha256Sign/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign
+++ b/BaseTools/BinWrappers/PosixLike/Rsa2048Sha256Sign
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/TargetTool b/BaseTools/BinWrappers/PosixLike/TargetTool
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/TargetTool
+++ b/BaseTools/BinWrappers/PosixLike/TargetTool
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/Trim b/BaseTools/BinWrappers/PosixLike/Trim
index 7cac4f7c4f..6c8dde5bec 100755
--- a/BaseTools/BinWrappers/PosixLike/Trim
+++ b/BaseTools/BinWrappers/PosixLike/Trim
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 exe=$(basename "$full_cmd")
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$exe/$exe.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/UPT b/BaseTools/BinWrappers/PosixLike/UPT
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/UPT
+++ b/BaseTools/BinWrappers/PosixLike/UPT
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"
diff --git a/BaseTools/BinWrappers/PosixLike/build b/BaseTools/BinWrappers/PosixLike/build
index 214d88fff1..01ae23ddeb 100755
--- a/BaseTools/BinWrappers/PosixLike/build
+++ b/BaseTools/BinWrappers/PosixLike/build
@@ -10,5 +10,5 @@ full_cmd=${BASH_SOURCE:-$0} # see http://mywiki.wooledge.org/BashFAQ/028 for a d
 dir=$(dirname "$full_cmd")
 cmd=${full_cmd##*/}
 
-export PYTHONPATH="$dir/../../Source/Python"
+export PYTHONPATH="$dir/../../Source/Python${PYTHONPATH:+:"$PYTHONPATH"}"
 exec "${python_exe:-python}" "$dir/../../Source/Python/$cmd/$cmd.py" "$@"