Found the following significant warnings:
  form.c:14:9: warning: ‘curl_formadd’ is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  form.c:14:9: warning: ‘CURLFORM_COPYNAME’ is deprecated: since 7.56.0. Use curl_mime_name() [-Wdeprecated-declarations]
  form.c:14:9: warning: ‘CURLFORM_COPYCONTENTS’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  form.c:14:9: warning: ‘CURLFORM_CONTENTSLENGTH’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  form.c:17:9: warning: ‘curl_formadd’ is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  form.c:17:9: warning: ‘CURLFORM_COPYNAME’ is deprecated: since 7.56.0. Use curl_mime_name() [-Wdeprecated-declarations]
  form.c:17:9: warning: ‘CURLFORM_COPYCONTENTS’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  form.c:25:11: warning: ‘curl_formadd’ is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  form.c:25:11: warning: ‘CURLFORM_COPYNAME’ is deprecated: since 7.56.0. Use curl_mime_name() [-Wdeprecated-declarations]
  form.c:25:11: warning: ‘CURLFORM_FILE’ is deprecated: since 7.56.0. Use curl_mime_filedata() [-Wdeprecated-declarations]
  form.c:25:11: warning: ‘CURLFORM_CONTENTTYPE’ is deprecated: since 7.56.0. Use curl_mime_type() [-Wdeprecated-declarations]
  form.c:27:11: warning: ‘curl_formadd’ is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  form.c:27:11: warning: ‘CURLFORM_COPYNAME’ is deprecated: since 7.56.0. Use curl_mime_name() [-Wdeprecated-declarations]
  form.c:27:11: warning: ‘CURLFORM_FILE’ is deprecated: since 7.56.0. Use curl_mime_filedata() [-Wdeprecated-declarations]
  form.c:35:11: warning: ‘curl_formadd’ is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  form.c:35:11: warning: ‘CURLFORM_COPYNAME’ is deprecated: since 7.56.0. Use curl_mime_name() [-Wdeprecated-declarations]
  form.c:35:11: warning: ‘CURLFORM_COPYCONTENTS’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  form.c:35:11: warning: ‘CURLFORM_CONTENTSLENGTH’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  form.c:35:11: warning: ‘CURLFORM_CONTENTTYPE’ is deprecated: since 7.56.0. Use curl_mime_type() [-Wdeprecated-declarations]
  form.c:37:11: warning: ‘curl_formadd’ is deprecated: since 7.56.0. Use curl_mime_init() [-Wdeprecated-declarations]
  form.c:37:11: warning: ‘CURLFORM_COPYNAME’ is deprecated: since 7.56.0. Use curl_mime_name() [-Wdeprecated-declarations]
  form.c:37:11: warning: ‘CURLFORM_COPYCONTENTS’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  form.c:37:11: warning: ‘CURLFORM_CONTENTSLENGTH’ is deprecated: since 7.56.0. Use curl_mime_data() [-Wdeprecated-declarations]
  handle.c:49:7: warning: ‘curl_formfree’ is deprecated: since 7.56.0. Use curl_mime_free() [-Wdeprecated-declarations]
  handle.c:292:5: warning: ‘CURLOPT_PROGRESSFUNCTION’ is deprecated: since 7.32.0. Use CURLOPT_XFERINFOFUNCTION [-Wdeprecated-declarations]
  typechecking.c:62:3: warning: ‘CURLOPT_EGDSOCKET’ is deprecated: since 7.84.0. Serves no purpose anymore [-Wdeprecated-declarations]
  typechecking.c:62:3: warning: ‘CURLOPT_RANDOM_FILE’ is deprecated: since 7.84.0. Serves no purpose anymore [-Wdeprecated-declarations]
  typechecking.c:62:3: warning: ‘CURLOPT_SOCKS5_GSSAPI_SERVICE’ is deprecated: since 7.49.0. Use CURLOPT_PROXY_SERVICE_NAME [-Wdeprecated-declarations]
  utils.c:19:5: warning: ‘curl_formfree’ is deprecated: since 7.56.0. Use curl_mime_free() [-Wdeprecated-declarations]
See ‘/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/curl.Rcheck/00install.out’ for details.
* used C compiler: ‘gcc-12 (Debian 12.2.0-11) 12.2.0’