Submitted upstream at https://gitlab.kitware.com/cmake/cmake/-/merge_requests/7670.

diff --git a/Source/cmCurl.cxx b/Source/cmCurl.cxx
index 28ee24dfe9..fc5405213a 100644
--- a/Source/cmCurl.cxx
+++ b/Source/cmCurl.cxx
@@ -38,6 +38,14 @@ std::string cmCurlSetCAInfo(::CURL* curl, const std::string& cafile)
     ::CURLcode res = ::curl_easy_setopt(curl, CURLOPT_CAINFO, cafile.c_str());
     check_curl_result(res, "Unable to set TLS/SSL Verify CAINFO: ");
   }
+  /* Honor the user-configurable OpenSSL environment variables. */
+  else if (cmSystemTools::GetEnv("SSL_CERT_FILE", e)) {
+    ::CURLcode res = ::curl_easy_setopt(curl, CURLOPT_CAINFO, e.c_str());
+    check_curl_result(res, "Unable to set TLS/SSL Verify CAINFO: ");
+  } else if (cmSystemTools::GetEnv("SSL_CERT_DIR", e)) {
+    ::CURLcode res = ::curl_easy_setopt(curl, CURLOPT_CAPATH, e.c_str());
+    check_curl_result(res, "Unable to set TLS/SSL Verify CAINFO: ");
+  }
 #ifdef CMAKE_FIND_CAFILE
 #  define CMAKE_CAFILE_FEDORA "/etc/pki/tls/certs/ca-bundle.crt"
   else if (cmSystemTools::FileExists(CMAKE_CAFILE_FEDORA, true)) {
?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>refs</a><a class='active' href='/guix/log/gnu/services/messaging.scm'>log</a><a href='/guix/tree/gnu/services/messaging.scm?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>tree</a><a href='/guix/commit/gnu/services/messaging.scm?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>commit</a><a href='/guix/diff/gnu/services/messaging.scm?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/services/messaging.scm'>
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<div class='path'>path: <a href='/guix/log/?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>root</a>/<a href='/guix/log/gnu?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>gnu</a>/<a href='/guix/log/gnu/services?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>services</a>/<a href='/guix/log/gnu/services/messaging.scm?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302'>messaging.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/messaging.scm?id=6cf3b1c265e6d89e3cbfbae22d937fdf65c4a302&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-09-15 14:40:20 +0200'>2020-09-15</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=1b157bbef0032121c88be2bbb834846115ce9341'>services: bitlbee: Support libpurple plugins.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/messaging.scm (bitlbee-shepherd-service): Pass
PURPLE_PLUGIN_PATH as #:environment-variables.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-13 23:12:43 +0100'>2019-03-13</span></td><td><a href='/guix/commit/gnu/services/messaging.scm?id=59e80445882f8b0379e54916f89510c0deda6698'>Remove traces of "GuixSD".</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/bootloader/extlinux.scm (extlinux-configuration-file): Remove
mentions of "GuixSD".
* gnu/bootloader/grub.scm (install-grub-efi): Likewise.
* gnu/build/vm.scm (make-iso9660-image): Change default #:volume-id to
"Guix_image".
(initialize-hard-disk): Search for the "Guix_image" label.
* gnu/ci.scm (system-test-jobs, tarball-jobs): Remove "GuixSD".
* gnu/installer/newt/welcome.scm (run-welcome-page): Likewise.
* gnu/packages/audio.scm (supercollider)[description]: Likewise.
* gnu/packages/curl.scm (curl): Likewise.
* gnu/packages/emacs.scm (emacs): Likewise.
* gnu/packages/gnome.scm (network-manager): Likewise.
* gnu/packages/julia.scm (julia): Likewise.
* gnu/packages/linux.scm (alsa-plugins): Likewise.
(powertop, wireless-regdb): Likewise.
* gnu/packages/package-management.scm (guix): Likewise.
* gnu/packages/polkit.scm (polkit): Likewise.
* gnu/packages/tex.scm (texlive-bin): Likewise.
* gnu/services/base.scm (file-systems-&gt;fstab): Likewise.
* gnu/services/cups.scm (%cups-activation): Likewise.
* gnu/services/mail.scm (%dovecot-activation): Likewise.
* gnu/services/messaging.scm (prosody-configuration)[log]: Likewise.
* gnu/system/examples/vm-image.tmpl (vm-image-motd): Likewise.
* gnu/system/install.scm (installation-os)[file-systems]: Change root
file system label to "Guix_image".
* gnu/system/mapped-devices.scm (check-device-initrd-modules):
Remove "GuixSD".
* gnu/system/vm.scm (system-docker-image): Likewise.
(system-disk-image)[root-label]: Change to "Guix_image".
* gnu/tests/install.scm (run-install): Remove "GuixSD".
* guix/modules.scm (guix-module-name?): Likewise.
* nix/libstore/optimise-store.cc: Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>