diff --git a/launch_agents/me.jimeh.logrotate.plist b/launch_agents/me.jimeh.logrotate.plist
index bc5ce7a..2db8aa6 100644
--- a/launch_agents/me.jimeh.logrotate.plist
+++ b/launch_agents/me.jimeh.logrotate.plist
@@ -17,7 +17,7 @@
     <key>EnvironmentVariables</key>
     <dict>
       <key>PATH</key>
-      <string>/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/sbin</string>
+      <string>/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/sbin:/opt/homebrew/bin:/opt/homebrew/sbin</string>
     </dict>
     <key>StartCalendarInterval</key>
     <dict>
diff --git a/powconfig b/powconfig
index 39b09a2..b4114c3 100644
--- a/powconfig
+++ b/powconfig
@@ -1,3 +1,3 @@
 export POW_DST_PORT=88
 export HOME=~
-export PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:/usr/local/bin:$PATH"
+export PATH="$HOME/.rbenv/shims:$HOME/.rbenv/bin:/usr/local/bin:/opt/homebrew/bin:$PATH"
diff --git a/zsh/google-cloud.zsh b/zsh/google-cloud.zsh
index c475550..acdce1a 100644
--- a/zsh/google-cloud.zsh
+++ b/zsh/google-cloud.zsh
@@ -2,10 +2,6 @@
 # Google Cloud SDK setup.
 #
 
-if [ -f '/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/path.zsh.inc' ]; then
-  source '/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/path.zsh.inc'
-fi
-
 # Lazy load gcloud shell completion on first use.
 if command-exists gcloud; then
   _python_argcomplete() {
@@ -17,8 +13,8 @@ if command-exists gcloud; then
 
   load-gcloud-completion() {
     unset -f load-gcloud-completion _python_argcomplete
-    if [ -f '/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/completion.zsh.inc' ]; then
-      source '/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/completion.zsh.inc'
+    if [ -n "$HOMEBREW_PREFIX" ]; then
+      source-if-exists "${HOMEBREW_PREFIX}/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/completion.zsh.inc"
     fi
   }
 fi
diff --git a/zsh/kubernetes.zsh b/zsh/kubernetes.zsh
index 48413a3..85e6553 100644
--- a/zsh/kubernetes.zsh
+++ b/zsh/kubernetes.zsh
@@ -23,11 +23,13 @@ if command-exists kubectl; then
   }
   _setup-kubectl-completion
 
-  switch() {
-    unset -f switch
-    source "$(brew --prefix switch)/switch.sh"
-    switch "$@"
-  }
+  if command-exists brew-prefix; then
+    switch() {
+      unset -f switch
+      source "$(brew-prefix switch)/switch.sh"
+      switch "$@"
+    }
+  fi
 
   export KREW_ROOT="$HOME/.krew"
   path_append "${KREW_ROOT}/bin"
diff --git a/zshenv b/zshenv
index 011b562..ad8b652 100644
--- a/zshenv
+++ b/zshenv
@@ -68,6 +68,12 @@ command-exists() {
   return $?
 }
 
+source-if-exists() {
+  if [ -f "$1" ]; then
+    source "$1"
+  fi
+}
+
 # ==============================================================================
 # System Environment Setup
 # ==============================================================================
@@ -126,6 +132,26 @@ if [ -f "/opt/homebrew/bin/brew" ]; then
   eval "$(/opt/homebrew/bin/brew shellenv)"
 fi
 
+if command-exists brew; then
+  typeset -A _brew_prefix_cache
+
+  brew-prefix() {
+    local package="$1"
+
+    if [[ -z "$package" ]]; then
+      package="__none__"
+    fi
+
+    if [[ -n "${_brew_prefix_cache[$package]}" ]]; then
+      echo "${_brew_prefix_cache[$package]}"
+    else
+      local result=$(brew --prefix "$package")
+      _brew_prefix_cache[$package]=$result
+      echo $result
+    fi
+  }
+fi
+
 # Linuxbrew
 if [ -f "/home/linuxbrew/.linuxbrew/bin/brew" ]; then
   # Inline linux-brew setup to improve shell startup speed by around 200ms.
@@ -209,11 +235,12 @@ path_prepend "$HOME/.local/share/rtx/bin"
 path_prepend "$HOME/.local/share/rtx/shims"
 
 # orbstack setup
-if [ -f "$HOME/.orbstack/shell/init.zsh" ]; then
-  source "$HOME/.orbstack/shell/init.zsh"
-fi
+source-if-exists "$HOME/.orbstack/shell/init.zsh"
 path_prepend "$HOME/.orbstack/bin"
 
+# Google Cloud SDK setup
+source-if-exists "${HOMEBREW_PREFIX}/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/path.zsh.inc"
+
 # ==============================================================================
 # Path setup for select binaries installed with zinit
 # ==============================================================================
diff --git a/zshrc b/zshrc
index 00f4150..5c8c5b7 100644
--- a/zshrc
+++ b/zshrc
@@ -116,6 +116,11 @@ fi
 # Prompt
 # ==============================================================================
 
+if ! command-exists starship; then
+  read -q 'REPLY?starship is not installed, install with `rtx install starship`? [y/N]:' &&
+    echo && rtx install starship
+fi
+
 if command-exists starship; then
   eval "$(starship init zsh --print-full-init)"