diff --git a/Other/build.ps1 b/Other/build.ps1
index 6ad1bde5..47390f65 100644
--- a/Other/build.ps1
+++ b/Other/build.ps1
@@ -3,14 +3,28 @@ Push-Location (Split-Path $MyInvocation.MyCommand.Path -Parent)
 .\clean.ps1
 
 Get-ChildItem -Path '.' -Directory | ForEach-Object {
+    Set-Location (Split-Path $MyInvocation.MyCommand.Path -Parent)
+
     $name=$_.Name
 
-    Write-Host "Building $name"
-    & ".\$name\build.ps1"
+    if ( Test-Path ".\$name\build.ps1" ) {
+        Write-Host "Building $name"
 
-    if ( -Not $? ) {
-        Write-Host "Build $name failed"
-        exit $lastExitCode
+        & ".\$name\build.ps1"
+        if ( -Not $? ) {
+            Write-Host "Build $name failed"
+            exit $lastExitCode
+        }
+    }
+}
+
+Get-ChildItem -Path '.' -Directory | ForEach-Object {
+    Set-Location (Split-Path $MyInvocation.MyCommand.Path -Parent)
+
+    $name=$_.Name
+
+    if ( Test-Path ".\$name\src" ) {
+        rm -Recurse -Force ".\$name\src"
     }
 }