Script to install cURL CA certificates on OS X without macports

mac-curl-ca-bundle.sh

#!/bin/bash
mkdir /tmp/curl-ca-bundle
cd /tmp/curl-ca-bundle
wget http://curl.haxx.se/download/curl-7.22.0.tar.bz2
tar xzf curl-7.22.0.tar.bz2
cd curl-7.22.0/lib/
./mk-ca-bundle.pl
if [ ! -d /usr/share/curl/ ]; then
	sudo mkdir -p /usr/share/curl/
else
	sudo mv /usr/share/curl/ca-bundle.crt /usr/share/curl/ca-bundle.crt.original
fi
sudo mv ca-bundle.crt /usr/share/curl/ca-bundle.crt
echo
echo "Done!"

@cellulosa

If @ashutoshrishi solution is not working, you may need to complete two additional steps.

After running:

wget http://curl.haxx.se/download/curl-7.49.1.tar.gz
tar xzf curl-7.49.1.tar.gz
cd curl-7.49.1/lib/

Check to see if you are receiving the error: Couldn't open certdata.txt: No such file or directory at ./mk-ca-bundle.pl line 126..

If this is the case, open the script and look for the release url for certdata.

Get the certdata file and place it in the same directory as the ./mk-ca-bundle.pl

wget https://hg.mozilla.org/releases/mozilla-release/raw-file/default/security/nss/lib/ckfw/builtins/certdata.txt

Finally, run:

./mk-ca-bundle.pl

Don't forget to tell weechat where the new ca-bundle.crt is:

weechat: /set weechat.network.gnutls_ca_file = "~/.weechat/certs/ca-bundle.crt"

You may need to add this file to the ~/.weechat/weechat.conf if it does not persist across sessions

@ElpsySec Thanks much for this

@ElpsySec thank you!

Setting /set weechat.network.gnutls_ca_file "/usr/local/etc/openssl/cert.pem" as in WeeChat FAQ works for me. Homebrew OpenSSL Caveats says:

==> Caveats
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

This formula is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.zshrc

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/openssl/lib
    CPPFLAGS: -I/usr/local/opt/openssl/include
For pkg-config to find this software you may need to set:
    PKG_CONFIG_PATH: /usr/local/opt/openssl/lib/pkgconfig

Confirming that solution provided by @oblitum works. Many thanks!