I am on Ubuntu 14.04 and need curl version > 7.40 so I have followed some steps to install latest curl version (7.48)
As root
wget http://curl.haxx.se/download/curl-7.48.0.tar.gz
apt-get install libtool
apt-get install make
Extracted the file
tar -xvf curl-7.48.0.tar.gz
then in the extracted folder:
./buildconf
./configure
make
make install
Updated the binaries
mv /usr/bin/curl /usr/bin/curl.bak
cp /usr/local/bin/curl /usr/bin/curl
then restarted the machine. I can see the new curl version but the libcurl library is not updated, is still 7.35
root:~# curl -V curl 7.48.0 (x86_64-unknown-linux-gnu) libcurl/7.35.0, OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3 Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp smtp smtps telnet tftp Features: AsynchDNS IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP
I've checked the file /etc/ld.so.conf but it doesn't give me much info
include /etc/ld.so.conf.d/*.conf
As well the folder:
root:/etc/ld.so.conf.d# ll
total 52
drwxr-xr-x 2 root root 4096 Feb 18 14:17 ./
drwxr-xr-x 167 root root 12288 Apr 26 14:30 ../
-rwxr-xr-x 1 root root 26 Nov 21 2007 agnclient-compat.conf*
-rw-r--r-- 1 root root 14 Aug 24 2009 agns.conf
-rw-rw-r-- 1 root root 38 Mar 24 2014 fakeroot-x86_64-linux-gnu.conf
lrwxrwxrwx 1 root root 40 Feb 5 16:42 i386-linux-gnu_GL.conf -> /etc/alternatives/i386-linux-gnu_gl_conf
-rw-r--r-- 1 root root 108 Apr 12 2014 i686-linux-gnu.conf
-rw-r--r-- 1 root root 44 Aug 9 2009 libc.conf
-rw-r--r-- 1 root root 33 Aug 1 2014 symav.conf
-rw-r--r-- 1 root root 68 Apr 12 2014 x86_64-linux-gnu.conf
lrwxrwxrwx 1 root root 43 Feb 3 12:05 x86_64-linux-gnu_EGL.conf -> /etc/alternatives/x86_64-linux-gnu_egl_conf
lrwxrwxrwx 1 root root 42 Feb 3 12:05 x86_64-linux-gnu_GL.conf -> /etc/alternatives/x86_64-linux-gnu_gl_conf
-rw-r--r-- 1 root root 56 Apr 12 2014 zz_i386-biarch-compat.conf
-rw-r--r-- 1 root root 58 Apr 12 2014 zz_x32-biarch-compat.conf
root:/etc/ld.so.conf.d#
Update
going through each conf file I have found 3 places where there is libcurl library
under /usr/lib/agnclient-compat (agnclient is an AT&T VPN agent client)
lrwxrwxrwx 1 root root 16 Feb 3 12:11 libcurl.so.3 -> libcurl.so.3.0.0
-rw-r--r-- 1 root root 248028 Nov 21 2007 libcurl.so.3.0.0
under /usr/local/lib
lrwxrwxrwx 1 root root 16 Apr 25 12:34 libcurl.so -> libcurl.so.4.4.0*
lrwxrwxrwx 1 root root 16 Apr 25 12:34 libcurl.so.4 -> libcurl.so.4.4.0*
-rwxr-xr-x 1 root root 376889 Apr 25 12:34 libcurl.so.4.4.0*
and under /usr/lib/x86_64-linux-gnu
lrwxrwxrwx 1 root root 19 Jan 26 20:05 libcurl-gnutls.so.3 -> libcurl-gnutls.so.4
lrwxrwxrwx 1 root root 23 Jan 26 20:05 libcurl-gnutls.so.4 -> libcurl-gnutls.so.4.3.0
-rw-r--r-- 1 root root 401512 Jan 26 20:05 libcurl-gnutls.so.4.3.0
lrwxrwxrwx 1 root root 12 Jan 26 20:05 libcurl.so.3 -> libcurl.so.4
lrwxrwxrwx 1 root root 16 Jan 26 20:05 libcurl.so.4 -> libcurl.so.4.3.0
-rw-r--r-- 1 root root 422696 Jan 26 20:05 libcurl.so.4.3.0
So the latest lib which I've installed yesterday is under /usr/local/lib, but it loads the one from the VPN client.
$PATHprecedence