Whoops, forgot to include this dummy precmd implementation.

lib/prompt.zsh

@@ -22,4 +22,8 @@ setopt prompt_subst
 
 export LSCOLORS="Gxfxcxdxbxegedabagacad"
 
+function oh_my_zsh_theme_precmd() {
+  # Blank function; override this in your themes
+}
+
 source "$ZSH/themes/$ZSH_THEME.zsh-theme"