$ src/metar -v -d kiad
Retrieving URL https://tgftp.nws.noaa.gov/data/observations/metar/stations/KIAD.TXT
*   Trying 140.90.101.79...
* TCP_NODELAY set
* Connected to tgftp.nws.noaa.gov (140.90.101.79) port 443 (#0)
* Initializing NSS with certpath: none
* WARNING: failed to load NSS PEM library libnsspem.so. Using OpenSSL PEM certificates will not work.
* Curl_http_done: called premature == 0
* Closing connection 0
curl error: Problem with the SSL CA cert (path? access rights?) [77]