diff --git a/build.ps1 b/build.ps1
index 836998e1..708d9b65 100755
--- a/build.ps1
+++ b/build.ps1
@@ -16,23 +16,28 @@ if ((Get-Command "cl.exe" -ErrorAction SilentlyContinue) -eq $null)
   Write-Host "Visual Studio 2017 ${vstype} Command Prompt variables set.`n" -ForegroundColor Yellow
 }
 
-# DEBUG
-New-Item -Path .\build_win_debug -ItemType directory -Force
-Set-Location build_win_debug
-cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=$env:VCPKG_ROOT\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=$env:VCPKG_DEFAULT_TRIPLET" "-DCMAKE_BUILD_TYPE=Debug" ..
-cmake --build . --config Debug --parallel ${number_of_build_workers}
-Set-Location ..
+if (Test-Path env:VCPKG_ROOT) {
+  # DEBUG
+  New-Item -Path .\build_win_debug -ItemType directory -Force
+  Set-Location build_win_debug
+  cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=$env:VCPKG_ROOT\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=$env:VCPKG_DEFAULT_TRIPLET"   "-DCMAKE_BUILD_TYPE=Debug" ..
+  cmake --build . --config Debug --parallel ${number_of_build_workers}
+  Set-Location ..
 
-# RELEASE
-New-Item -Path .\build_win_release -ItemType directory -Force
-Set-Location build_win_release
-cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=$env:VCPKG_ROOT\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=$env:VCPKG_DEFAULT_TRIPLET" "-DCMAKE_BUILD_TYPE=Release" ..
-cmake --build . --config Release --parallel ${number_of_build_workers}
-Set-Location ..
+  # RELEASE
+  New-Item -Path .\build_win_release -ItemType directory -Force
+  Set-Location build_win_release
+  cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" "-DCMAKE_TOOLCHAIN_FILE=$env:VCPKG_ROOT\scripts\buildsystems\vcpkg.cmake" "-DVCPKG_TARGET_TRIPLET=$env:VCPKG_DEFAULT_TRIPLET"   "-DCMAKE_BUILD_TYPE=Release" ..
+  cmake --build . --config Release --parallel ${number_of_build_workers}
+  Set-Location ..
+}
+else {
+  Write-Host "Skipping vcpkg-enabled builds because the VCPKG_ROOT environment variable is not defined`n" -ForegroundColor Yellow
+}
 
 # USE LOCAL PTHREAD LIB, NO VCPKG: remember to use "vcpkg.exe integrate remove" in case you had enable user-wide vcpkg integration
 New-Item -Path .\build_win_release_cuda_int_libs -ItemType directory -Force
-Set-Location build_win_release_cuda_custom_libs
+Set-Location build_win_release_cuda_int_libs
 cmake -G "Visual Studio 15 2017" -T "host=x64" -A "x64" ..
 cmake --build . --config Release --parallel ${number_of_build_workers}
 Set-Location ..