Installing R Package httpgd in R version 4.5.0

As we know, the R package `httpgd` has been archived since April 23, 2025, and for users who have just installed R, of course, they can no longer use it. The archiving message can be seen at: https://cran.r-project.org/web/packages/httpgd/index.html

```[plaintext] Package ‘httpgd’ was removed from the CRAN repository. Formerly available versions can be obtained from the archive. Archived on 2025-04-23 as issues were not corrected in time A summary of the most recent check results can be obtained from the check results archive. Please use the canonical form https://CRAN.R-project.org/package=httpgd to link to this page. ```

So, we need to install this package directly through its GitHub repository (nx10/httpgd), using the following R command:

```[r] remotes::install_github("nx10/httpgd") ```

If you get the error `Error in loadNamespace(x) : there is no package called ‘remotes’`, it means the `remote` R package is not installed, install it first using the following R code:

```[r] install.packages("remotes") ```

Then, install the `httpgd` package. If you get an error like this:

```[bash] <stdin>:1:10: fatal error: fontconfig/fontconfig.h: No such file or directory compilation terminated. ```

You need to install the `libfontconfig1-dev` software package. Open a terminal, run the following code:

```[bash] sudo apt-get install libfontconfig1-dev ```

If you get an error like this:

```[bash] Warning messages: 1: In i.p(...) : installation of package ‘systemfonts’ had non-zero exit status 2: In i.p(...) : installation of package ‘unigd’ had non-zero exit status 3: In i.p(...) : installation of package ‘/tmp/RtmpQJCS02/file25dce390720dc/httpgd_2.0.4.tar.gz’ had non-zero exit status ```

Then you must first install the `systemfonts` and `unigd` packages in R, with the following code:

```[r] install.packages("systemfonts") install.packages("unigd") ```

Then, re-install `httpgd` via GitHub nx10/httpgd. Restart the R terminal, then the `httpgd` package is installed and can be used in graphical creation using the command:

```[r] library(httpgd) ```