diff --git a/README.md b/README.md
index 70060531..4d9db74e 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,38 @@ To install:
 
 Or if you are using zsh just change `bash` with `zsh`
 
+Installing from source
+======================
+
+The installer clones a repository, so it can install any fork or branch. Point
+`SRC_REPO` at the repository and pass the branch or tag as the first argument
+(it defaults to `master`):
+
+```
+SRC_REPO=https://github.com/danish-a1/gvm.git \
+  bash < <(curl -s -S -L https://raw.githubusercontent.com/danish-a1/gvm/master/binscripts/gvm-installer) master
+```
+
+To install from a clone you already have, run the installer from inside it —
+it copies the working tree instead of cloning:
+
+```
+git clone https://github.com/danish-a1/gvm.git
+cd gvm
+./binscripts/gvm-installer
+```
+
+The installer refuses to overwrite an existing install, so remove the old one
+first and open a new shell afterwards:
+
+```
+rm -rf ~/.gvm
+```
+
+Your Go versions live in `~/.gvm/gos` and are deleted with it. To keep them,
+move the directory aside and move `gos`, `pkgsets` and `environments` back
+after installing.
+
 Installing Go
 =============
     gvm install go1.4
diff --git a/VERSION b/VERSION
index c787b213..154b9fce 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.22
+1.0.23
diff --git a/scripts/env/pkgset-use b/scripts/env/pkgset-use
index 07dae8db..9dc7b730 100644
--- a/scripts/env/pkgset-use
+++ b/scripts/env/pkgset-use
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 
+. "$GVM_ROOT/scripts/functions" || return 1
 . "$GVM_ROOT/scripts/function/_bash_pseudo_hash" || return 1
 . "$GVM_ROOT/scripts/function/_shell_compat" || return 1
 
diff --git a/scripts/env/use b/scripts/env/use
index 9776cd24..1616e22a 100644
--- a/scripts/env/use
+++ b/scripts/env/use
@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
 
+. "$GVM_ROOT/scripts/functions" || return 1
 . "$GVM_ROOT/scripts/function/_bash_pseudo_hash" || return 1
 . "$GVM_ROOT/scripts/function/_shell_compat" || return 1
 
diff --git a/scripts/function/_bash_pseudo_hash b/scripts/function/_bash_pseudo_hash
index d6e3a634..4d1e72f4 100644
--- a/scripts/function/_bash_pseudo_hash
+++ b/scripts/function/_bash_pseudo_hash
@@ -286,7 +286,7 @@ _encode() {
                 new_string+="$__char"
                 ;;
             *)
-                hex="$(echo -n "$__char" | $HEXDUMP_PATH -e '1 1 "!%02x"')"
+                hex="$(echo -n "$__char" | ${HEXDUMP_PATH:-hexdump} -e '1 1 "!%02x"')"
                 new_string+="${hex//!/%}"
                 ;;
         esac
diff --git a/scripts/function/gvm_environment_sanitize b/scripts/function/gvm_environment_sanitize
index 38c8d456..71023be5 100644
--- a/scripts/function/gvm_environment_sanitize
+++ b/scripts/function/gvm_environment_sanitize
@@ -4,7 +4,7 @@ function gvm_environment_sanitize() {
 	if [[ "${ACTIVE_GO/${GOROOT}}" != "/bin/go" ]]; then
 		OLD_GOROOT="$GOROOT" && unset GOROOT
 		GOROOT="$(go env GOROOT)"
-		$SED_PATH -i'' -e 's|'${OLD_GOROOT}'|'${GOROOT}'|g' "$GVM_ROOT/environments/$1"
+		${SED_PATH:-sed} -i'' -e 's|'${OLD_GOROOT}'|'${GOROOT}'|g' "$GVM_ROOT/environments/$1"
 		. "$GVM_ROOT/environments/$1" &> /dev/null
 	fi
 }
diff --git a/scripts/function/gvm_export_path b/scripts/function/gvm_export_path
index ec26de19..8facf176 100644
--- a/scripts/function/gvm_export_path
+++ b/scripts/function/gvm_export_path
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 function gvm_export_path() {
-	export PATH="$GVM_ROOT/bin:$(echo "$PATH" | $TR_PATH ":" "\n" | "$GREP_PATH" -v '^$' | $EGREP_PATH -v "$GVM_ROOT/(pkgsets|gos|bin)" | $TR_PATH "\n" ":" | $SED_PATH 's/:*$//')"
+	export PATH="$GVM_ROOT/bin:$(echo "$PATH" | ${TR_PATH:-tr} ":" "\n" | "${GREP_PATH:-grep}" -v '^$' | ${EGREP_PATH:-egrep} -v "$GVM_ROOT/(pkgsets|gos|bin)" | ${TR_PATH:-tr} "\n" ":" | ${SED_PATH:-sed} 's/:*$//')"
 	export GVM_PATH_BACKUP="$PATH"
 }
 
diff --git a/scripts/templates/binary b/scripts/templates/binary
index d6ba181a..0f634032 100644
--- a/scripts/templates/binary
+++ b/scripts/templates/binary
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-. "$GVM_ROOT/scripts/functions/tools"
+. "$GVM_ROOT/scripts/function/tools"
 echo "$1" | sed -n -e '/_.*_/ p' | $GREP_PATH "_" &> /dev/null
 if [ "$?" == "0" ]; then
   version=$(echo $1 | sed 's/_\(.*\)_/\1/')