Error building curl 7.62.0 on Directadmin server against OpenSSL 1.0.1

If you have a custom installation of cURL to support of HTTP/2 and the recent version 7.62.0 fails to built with the error:

vtls/openssl.c: In function 'Curl_ossl_seed':
vtls/openssl.c:454:5: error: implicit declaration of function 'RAND_egd' [-Werror=implicit-function-declaration]
     int ret = RAND_egd(data->set.str[STRING_SSL_EGDSOCKET]?
     ^
cc1: some warnings being treated as errors
Makefile:2425: recipe for target 'vtls/libcurl_la-openssl.lo' failed
make[2]: *** [vtls/libcurl_la-openssl.lo] Error 1
make[2]: Leaving directory '/usr/local/directadmin/custombuild/curl-7.62.0/lib'
Makefile:1028: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/usr/local/directadmin/custombuild/curl-7.62.0/lib'
Makefile:929: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

*** The make has failed, would you like to try to make again? (y,n): 

we’ve got a solution for you.

Who is affected?

It was found that cURL 7.62.0 fails to build against OpenSSL 1.0.1 on Directadmin servers with Debian 8 (jessie) which are having a basic version of OpenSSL 1.0.1t installed from debian packages:

Debian 8 (jessie):

openssl 1.0.1t-1+deb8u10

Let’s get it fixed!

This is how you can fix it: you should upgrade the basic version the package to the latest available OpenSSL 1.1.1a.

Here are instructions on how to update it to the latest OpenSSL 1.1.1a:

cd /usr/local/directadmin/scripts/
wget https://raw.githubusercontent.com/StaffNowa/directadmin-utils/master/openssl/openssl.install-1.1.1-primary.sh
chmod +x openssl.install-1.1.1-primary.sh
./openssl.install-1.1.1-primary.sh

As we install the newer version over the existing one we need to lock the packages openssl-* with the following commands:

apt-mark hold openssl-*

to keep the newest OpenSSL version away from package updates.

Build cURL

cd /usr/local/directadmin/custombuild/
./build clean
./build update
./build curl

Check it to see:

curl -V
curl 7.62.0 (x86_64-pc-linux-gnu) libcurl/7.62.0 OpenSSL/1.1.1a zlib/1.2.8 nghttp2/1.35.0
Release-Date: 2018-10-31
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy 

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