diff --git a/do.ps1 b/do.ps1
index 5679fa9..7aa73b1 100755
--- a/do.ps1
+++ b/do.ps1
@@ -1,4 +1,22 @@
 #!/usr/bin/env pwsh
+
+$OUT_DIR  = "out";
+$DEPS_DIR = "thirdparty";
+$EXE_NAME = "p2601";
+
+$C_SOURCE      = "source/main.c";
+$C_INCLUDES    = "-Isrc -I$DEPS_DIR";
+$C_FLAGS       = "-std=c23 -fblocks -g $C_INCLUDES";
+$RELEASE_FLAGS = "-Ofast -Wno-everything -ffast-math";
+
+$WINDOWS_FLAGS = "-ld3d11 -lgdi32";
+$MACOS_FLAGS   = "-x objective-c -lobjc -framework Foundation -framework Cocoa -framework CoreFoundation -framework CoreGraphics -framework QuartzCore -framework Metal -framework MetalKit";
+$LINUX_FLAGS   = "-lgl";
+$WASM_FLAGS    = "-c -fno-sanitize=address -fno-sanitize=undefined";
+
+
+# ..............
+
 $ErrorActionPreference = "Stop";
 
 $HOST_OS = &{
@@ -21,11 +39,7 @@ $HOST_ARCH = &{
       "Arm64" { "aarch64" }
       default { Write-Error "Unsupported host architecture"; }
    }
-}
-
-$OUT_DIR  = "out";
-$DEPS_DIR = "thirdparty";
-$EXE_NAME = "p2601";
+};
 
 function Get-Ext($platform) {
    if ($platform -eq "windows") { return ".exe"; }
@@ -44,18 +58,9 @@ $BLOCKS_RT_RUNTIME = (Join-Path $BLOCKS_RT_DIR "BlocksRuntime" "runtime.c");
 $BLOCKS_RT_DATA    = (Join-Path $BLOCKS_RT_DIR "BlocksRuntime" "data.c");
 $BLOCKS_RT_SOURCE  = "$BLOCKS_RT_RUNTIME $BLOCKS_RT_DATA";
 
-$EMSDK_REPO = "https://github.com/emscripten-core/emsdk.git";
-$EMSDK_DIR  = Join-Path $DEPS_DIR "emsdk";
-
-$C_SOURCE      = "source/main.c";
-$C_INCLUDES    = "-Isrc -I$DEPS_DIR";
-$C_FLAGS       = "-std=c23 -fblocks -g $C_INCLUDES";
-$RELEASE_FLAGS = "-Ofast -Wno-everything -ffast-math";
-
-$WINDOWS_FLAGS = "-ld3d11 -lgdi32";
-$MACOS_FLAGS   = "-x objective-c -lobjc -framework Foundation -framework Cocoa -framework CoreFoundation -framework CoreGraphics -framework QuartzCore -framework Metal -framework MetalKit";
-$LINUX_FLAGS   = "-lgl";
-$WASM_FLAGS    = "-c -fno-sanitize=address -fno-sanitize=undefined -isystem " + (Join-Path $EMSDK_DIR "upstream" "emscripten" "cache" "sysroot" "include");
+$EMSDK_REPO =  "https://github.com/emscripten-core/emsdk.git";
+$EMSDK_DIR  =  Join-Path $DEPS_DIR "emsdk";
+$WASM_FLAGS += " -isystem" + (Join-Path $EMSDK_DIR "upstream" "emscripten" "cache" "sysroot" "include");
 
 # try vendoring zig
 if (-not (Test-Path $ZIG)) {
diff --git a/justfile b/justfile
index 83bc204..8ed12f8 100644
--- a/justfile
+++ b/justfile
@@ -1,2 +1,14 @@
 default:
-	@pwsh do.ps1 b
+	@pwsh do.ps1 build
+
+windows:
+	@pwsh do.ps1 build-cross x86_64-windows-gnu
+
+linux:
+	@pwsh do.ps1 build-cross x86_64-linux-gnu
+
+wasm:
+	@pwsh do.ps1 build-cross wasm32-emscripten
+
+clean:
+	@pwsh do.ps1 clean