安装 openssh后，使用 curl 的 ./configure --with-ssl 时，报错“找不到 ssl”。因为 curl在 /usr/local/ssl的安装目录下找动态连接库。而ssl默认不生成动态连接库。解决办法是编译 ssl时使用 enable-shared 生成 动态连接库
./config enable-shared
curl version: 7.41.0
Host setup: x86_64-unknown-linux-gnu
Install prefix: /usr/local
Compiler: gcc
SSL support: enabled (OpenSSL)
SSH support: no (--with-libssh2)
zlib support: enabled
GSS-API support: no (--with-gssapi)
TLS-SRP support: enabled
resolver: default (--enable-ares / --enable-threaded-resolver)
IPv6 support: enabled
Unix sockets support: enabled
IDN support: no (--with-{libidn,winidn})
Build libcurl: Shared=yes, Static=yes
Built-in manual: enabled
--libcurl option: enabled (--disable-libcurl-option)
Verbose errors: enabled (--disable-verbose)
SSPI support: no (--enable-sspi)
ca cert bundle: /etc/pki/tls/certs/ca-bundle.crt
ca cert path: no
LDAP support: no (--enable-ldap / --with-ldap-lib / --with-lber-lib)
LDAPS support: no (--enable-ldaps)
RTSP support: enabled
RTMP support: no (--with-librtmp)
metalink support: no (--with-libmetalink)
HTTP2 support: disabled (--with-nghttp2)
Protocols: DICT FILE FTP FTPS GOPHER HTTP HTTPS IMAP IMAPS POP3 POP3S RTSP SMB SMBS SMTP SMTPS TELNET TFTP