Valgrind reports an immense number of errors for me. Running valgrind like
`valgrind curl https://example.com`. Tail end of that output:

==30282== Conditional jump or move depends on uninitialised value(s)
==30282== at 0x4E47689: Curl_pgrsUpdate (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E47DD8: Curl_pgrsDone (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E6AA57: multi_done (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E6B016: multi_runsingle (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E6C590: curl_multi_perform (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E64B51: curl_easy_perform (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x11D9EF: operate_do (in /usr/local/bin/curl)
==30282== by 0x11EEF9: operate (in /usr/local/bin/curl)
==30282== by 0x111343: main (in /usr/local/bin/curl)
==30282==
==30282== Conditional jump or move depends on uninitialised value(s)
==30282== at 0x4E477D8: Curl_pgrsUpdate (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E47DD8: Curl_pgrsDone (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E6AA57: multi_done (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E6B016: multi_runsingle (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E6C590: curl_multi_perform (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x4E64B51: curl_easy_perform (in /usr/lib64/libcurl.so.4.5.0)
==30282== by 0x11D9EF: operate_do (in /usr/local/bin/curl)
==30282== by 0x11EEF9: operate (in /usr/local/bin/curl)
==30282== by 0x111343: main (in /usr/local/bin/curl)
==30282==
==30282==
==30282== HEAP SUMMARY:
==30282== in use at exit: 1,696 bytes in 50 blocks
==30282== total heap usage: 32,159 allocs, 32,109 frees, 2,818,764 bytes allocated
==30282==
==30282== LEAK SUMMARY:
==30282== definitely lost: 0 bytes in 0 blocks
==30282== indirectly lost: 0 bytes in 0 blocks
==30282== possibly lost: 0 bytes in 0 blocks
==30282== still reachable: 1,696 bytes in 50 blocks
==30282== suppressed: 0 bytes in 0 blocks
==30282== Rerun with --leak-check=full to see details of leaked memory
==30282==
==30282== Use --track-origins=yes to see where uninitialised values come from
==30282== For lists of detected and suppressed errors, rerun with: -s
==30282== ERROR SUMMARY: 4944 errors from 386 contexts (suppressed: 0 from 0)

Running Gentoo x86-64, curl cloned from Github at commit 21b33b9 (latest at the
time of writing this). Using gentoo-sources kernel 4.20.8 and glibc-2.28-r5

Built/installed with:

`./buildconf`
`./configure`
`make -j8`
`sudo make install`

Configure script output about configured environment:

  Host setup: x86_64-pc-linux-gnu
  Install prefix: /usr/local
  Compiler: gcc
   CFLAGS: -Werror-implicit-function-declaration -O2 -Wno-system-headers -pthread
   CPPFLAGS:
   LDFLAGS:
   LIBS: -lnghttp2 -lidn2 -lssl -lcrypto -lssl -lcrypto -lldap -llber -lz

  curl version: 7.64.1-DEV
  SSL support: enabled (OpenSSL)
  SSH support: no (--with-libssh2)
  zlib support: enabled
  brotli support: no (--with-brotli)
  GSS-API support: no (--with-gssapi)
  TLS-SRP support: enabled
  resolver: POSIX threaded
  IPv6 support: enabled
  Unix sockets support: enabled
  IDN support: enabled (libidn2)
  Build libcurl: Shared=yes, Static=yes
  Built-in manual: enabled
  --libcurl option: enabled (--disable-libcurl-option)
  Verbose errors: enabled (--disable-verbose)
  Code coverage: disabled
  SSPI support: no (--enable-sspi)
  ca cert bundle: /etc/ssl/certs/ca-certificates.crt
  ca cert path: no
  ca fallback: no
  LDAP support: enabled (OpenLDAP)
  LDAPS support: enabled
  RTSP support: enabled
  RTMP support: no (--with-librtmp)
  metalink support: no (--with-libmetalink)
  PSL support: no (libpsl not found)
  HTTP2 support: enabled (nghttp2)
  Protocols: DICT FILE FTP FTPS GOPHER HTTP HTTPS IMAP IMAPS LDAP LDAPS POP3 POP3S RTSP SMB SMBS SMTP SMTPS TELNET TFTP
  Features: SSL IPv6 UnixSockets libz AsynchDNS IDN NTLM NTLM_WB TLS-SRP HTTP2 HTTPS-proxy

How can this be fixed?

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