diff --git a/build.sh b/build.sh
index db1e0c3dde..c7873ef58e 100755
--- a/build.sh
+++ b/build.sh
@@ -1,12 +1,12 @@
-#!/bin/sh
+#!/bin/bash
 
 if test `uname` = Darwin; then
     cachedir=~/Library/Caches/KBuild
 else
-    if x$XDG_DATA_HOME = x; then
-	cachedir=$HOME/.local/share
+    if [ -z $XDG_DATA_HOME ]; then
+        cachedir=$HOME/.local/share
     else
-	cachedir=$XDG_DATA_HOME;
+        cachedir=$XDG_DATA_HOME;
     fi
 fi
 mkdir -p $cachedir
@@ -14,12 +14,12 @@ mkdir -p $cachedir
 url=https://www.nuget.org/nuget.exe
 
 if test ! -f $cachedir/nuget.exe; then
-    wget -o $cachedir/nuget.exe $url 2>/dev/null || curl -o $cachedir/nuget.exe --location $url /dev/null
+    wget -O $cachedir/nuget.exe $url 2>/dev/null || curl -o $cachedir/nuget.exe --location $url /dev/null
 fi
 
 if test ! -e .nuget; then
     mkdir .nuget
-    cp $cachedir/nuget.exe .nuget
+    cp $cachedir/nuget.exe .nuget/nuget.exe
 fi
 
 if test ! -d packages/KoreBuild; then
@@ -27,4 +27,12 @@ if test ! -d packages/KoreBuild; then
     mono .nuget/nuget.exe install Sake -version 0.2 -o packages -ExcludeVersion
 fi
 
-mono packages/Sake/tools/Sake.exe -I packages/KoreBuild/build -f makefile.shade "$@"
\ No newline at end of file
+if ! type k > /dev/null 2>&1; then
+    source packages/KoreBuild/build/kvm.sh
+fi
+
+if ! type k > /dev/null 2>&1; then
+    kvm upgrade
+fi
+
+mono packages/Sake/tools/Sake.exe -I packages/KoreBuild/build -f makefile.shade "$@"