From 535e754ef55f087978b123b2ed951fa5d035e7e2 Mon Sep 17 00:00:00 2001
From: Achim Zeileis <Achim.Zeileis@uibk.ac.at>
Date: Fri, 18 Oct 2024 14:34:26 +0200
Subject: [PATCH] check whether gamlss.ggplots is available at all

---
 vignettes/quantiles.qmd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/vignettes/quantiles.qmd b/vignettes/quantiles.qmd
index 1248651..c9d034d 100644
--- a/vignettes/quantiles.qmd
+++ b/vignettes/quantiles.qmd
@@ -17,7 +17,7 @@ vignette: >
 ---
 
 ```{r preliminaries, echo=FALSE, message=FALSE, results="hide"}
-if(packageVersion("gamlss.ggplots") < "2.1-15") {
+if(!("gamlss.ggplots" %in% installed.packages()) || packageVersion("gamlss.ggplots") < "2.1-15") {
   install.packages("gamlss.ggplots", repos = "https://gamlss-dev.R-universe.dev")
 }