diff --git a/install.sh b/install.sh
index 234716f..e438eea 100755
--- a/install.sh
+++ b/install.sh
@@ -9,10 +9,16 @@ if [ -d "$NVM_TARGET" ]; then
   exit
 fi
 
-# Cloning to $NVM_TARGET
-git clone git://github.com/creationix/nvm.git $NVM_TARGET
+# Allow for alternate NVM sources so we can use a local copy or a fork
+if [ ! -d "$NVM_GIT_SOURCE" ]; then
+   export NVM_GIT_SOURCE="git://github.com/creationix/nvm.git"
+fi
 
-echo 
+
+# Cloning to $NVM_TARGET
+git clone $NVM_GIT_SOURCE $NVM_TARGET
+
+echo
 
 # Detect profile file, .bash_profile has precedence over .profile
 if [ ! -z "$1" ]; then
@@ -28,7 +34,7 @@ fi
 SOURCE_STR="[[ -s "$NVM_TARGET/nvm.sh" ]] && . "$NVM_TARGET/nvm.sh"  # This loads NVM"
 
 if [ -z "$PROFILE" ] || [ ! -f "$PROFILE" ] ; then
-  if [ -z $PROFILE ]; then 
+  if [ -z $PROFILE ]; then
 	echo "=> Profile not found"
   else
 	echo "=> Profile $PROFILE not found"
@@ -36,7 +42,7 @@ if [ -z "$PROFILE" ] || [ ! -f "$PROFILE" ] ; then
   echo "=> Append the following line to the correct file yourself"
   echo
   echo -e "\t$SOURCE_STR"
-  echo  
+  echo
   echo "=> Close and reopen your terminal to start using NVM"
   exit
 fi
diff --git a/nvm.sh b/nvm.sh
index c577cf7..66a73a7 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -10,6 +10,10 @@ if [ ! -d "$NVM_DIR" ]; then
     export NVM_DIR=$(cd $(dirname ${BASH_SOURCE[0]:-$0}) && pwd)
 fi
 
+if [ ! -d "$NODEJS_MIRROR" ]; then
+   export NODEJS_MIRROR="http://nodejs.org/"
+fi
+
 # Make zsh glob matching behave same as bash
 # This fixes the "zsh: no matches found" errors
 if [ ! -z "$(which unsetopt 2>/dev/null)" ]; then
@@ -90,7 +94,7 @@ nvm_ls_remote()
     else
         PATTERN=".*"
     fi
-    VERSIONS=`curl -s http://nodejs.org/dist/ \
+    VERSIONS=`curl -s $NODEJS_MIRROR/dist/ \
                   | egrep -o 'v[0-9]+\.[0-9]+\.[0-9]+' \
                   | grep -w "${PATTERN}" \
                   | sort -t. -u -k 1.2,1n -k 2,2n -k 3,3n`
@@ -242,8 +246,8 @@ nvm()
           esac
           if [ $binavail -eq 1 ]; then
             t="$VERSION-$os-$arch"
-            url="http://nodejs.org/dist/$VERSION/node-${t}.tar.gz"
-            sum=`curl -s http://nodejs.org/dist/$VERSION/SHASUMS.txt | grep node-${t}.tar.gz | awk '{print $1}'`
+            url="$NODEJS_MIRROR/dist/$VERSION/node-${t}.tar.gz"
+            sum=`curl -s $NODEJS_MIRROR/dist/$VERSION/SHASUMS.txt | grep node-${t}.tar.gz | awk '{print $1}'`
             if (
               mkdir -p "$NVM_DIR/bin/node-${t}" && \
               cd "$NVM_DIR/bin" && \
@@ -272,11 +276,11 @@ nvm()
       if [ "$os" = "freebsd" ]; then
 	make='gmake'
       fi
-      if [ "`curl -Is "http://nodejs.org/dist/$VERSION/node-$VERSION.tar.gz" | grep '200 OK'`" != '' ]; then
-        tarball="http://nodejs.org/dist/$VERSION/node-$VERSION.tar.gz"
-        sum=`curl -s http://nodejs.org/dist/$VERSION/SHASUMS.txt | grep node-$VERSION.tar.gz | awk '{print $1}'`
-      elif [ "`curl -Is "http://nodejs.org/dist/node-$VERSION.tar.gz" | grep '200 OK'`" != '' ]; then
-        tarball="http://nodejs.org/dist/node-$VERSION.tar.gz"
+      if [ "`curl -Is "$NODEJS_MIRROR/dist/$VERSION/node-$VERSION.tar.gz" | grep '200 OK'`" != '' ]; then
+        tarball="$NODEJS_MIRROR/dist/$VERSION/node-$VERSION.tar.gz"
+        sum=`curl -s $NODEJS_MIRROR/dist/$VERSION/SHASUMS.txt | grep node-$VERSION.tar.gz | awk '{print $1}'`
+      elif [ "`curl -Is "$NODEJS_MIRROR/dist/node-$VERSION.tar.gz" | grep '200 OK'`" != '' ]; then
+        tarball="$NODEJS_MIRROR/dist/node-$VERSION.tar.gz"
       fi
       if (
         [ ! -z $tarball ] && \