Fix

appveyor.yml

@@ -53,6 +53,8 @@ clone_script:
         Write-Host "[ OK ]" -ForegroundColor Green 
     }
     
+    $env:wsl_installed = false
+    
     $WSLjob = Start-Job -Name WSLInstall -ScriptBlock { 
         Function WSLExec($Text, $Cmd) {
             Write-Host "$Text" 
@@ -68,6 +70,7 @@ clone_script:
         WSLExec "WSL install..." "sudo apt-get -y install --reinstall --no-install-recommends git ca-certificates build-essential pkg-config libreadline-dev gcc-arm-none-eabi libnewlib-dev libbz2-dev qtbase5-dev cmake 1>/dev/null" 
         WSLExec "WSL QT fix..." "sudo strip --remove-section=.note.ABI-tag /usr/lib/x86_64-linux-gnu/libQt5Core.so.5"
         Add-AppveyorMessage -Message "WSL setup took $(([System.Environment]::TickCount-$WSLInstallTime) / 1000) sec" -Category Information
+        $env:wsl_installed = true
     }
     
     $env:PSInstallTime=[System.Environment]::TickCount
@@ -235,9 +238,9 @@ build_script:
         }
         
         #WSL: wait for installation to finish
-        Receive-Job -Wait -Name WSLInstall -ErrorAction SilentlyContinue
-        
-        Add-AppveyorMessage -Message "WSL start" -Category Information
+        while(!$env:wsl_installed) {
+            Start-Sleep -s 5
+        }
     
         #Windows Subsystem for Linux (WSL)
         Write-Host "---------- WSL make ----------" -ForegroundColor Yellow