WARNING: curl and libcurl versions do not match. Functionality may be affected.

[p1r473]

Hi I just built curl myself as the version on debians repo was out of date
Getting this warning: WARNING: curl and libcurl versions do not match. Functionality may be affected.
Ive uninstalled libcurl4-gnutls-dev and apt says I have nothing else named libcurl* installed. How do I compile latest libcurl?
I know that it is just a warning and probably wont break anything but Id still like to know
Thanks!

❯ curl --version
curl 8.7.1 (aarch64-unknown-linux-gnu) libcurl/7.88.1 OpenSSL/3.0.11 zlib/1.2.13 brotli/1.0.9 zstd/1.5.4 libidn2/2.3.3 libpsl/0.21.2 (+libidn2/2.3.3) libssh2/1.10.0 nghttp2/1.52.0 librtmp/2.3 OpenLDAP/2.5.13
Release-Date: 2024-03-27
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM NTLM_WB PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd
WARNING: curl and libcurl versions do not match. Functionality may be affected.

heres how I built it

wget -O /home/pi/curl-8.7.1.tar.gz https://github.com/curl/curl/releases/download/curl-8_7_1/curl-8.7.1.tar.gz
tar -xzf /home/pi/curl-8.7.1.tar.gz  -C /home/pi
cd /home/pi/curl-8.7.1
./configure --with-openssl
make
make install

[jay]

try ldd `which curl` to see where it is loading libcurl from. you may need to add a runpath so that the library is read from the correct location. for example if the install prefix is /usr/local then curl is in /usr/local/bin and libcurl is in /usr/local/lib

LDFLAGS="-Wl,--enable-new-dtags -Wl,-rpath,/usr/local/lib" ./configure ...

[p1r473]

❯ ldd 'which curl'

        linux-vdso.so.1 (0x00007fff4e350000)
        libcurl.so.4 => /lib/aarch64-linux-gnu/libcurl.so.4 (0x00007fff4e1e0000)
        libz.so.1 => /lib/aarch64-linux-gnu/libz.so.1 (0x00007fff4e1a0000)
        libc.so.6 => /lib/aarch64-linux-gnu/libc.so.6 (0x00007fff4dfe0000)
        libnghttp2.so.14 => /lib/aarch64-linux-gnu/libnghttp2.so.14 (0x00007fff4df90000)
        libidn2.so.0 => /lib/aarch64-linux-gnu/libidn2.so.0 (0x00007fff4df40000)
        librtmp.so.1 => /lib/aarch64-linux-gnu/librtmp.so.1 (0x00007fff4df00000)
        libssh2.so.1 => /lib/aarch64-linux-gnu/libssh2.so.1 (0x00007fff4dea0000)
        libpsl.so.5 => /lib/aarch64-linux-gnu/libpsl.so.5 (0x00007fff4de60000)
        libssl.so.3 => /lib/aarch64-linux-gnu/libssl.so.3 (0x00007fff4dda0000)
        libcrypto.so.3 => /lib/aarch64-linux-gnu/libcrypto.so.3 (0x00007fff4d940000)
        libgssapi_krb5.so.2 => /lib/aarch64-linux-gnu/libgssapi_krb5.so.2 (0x00007fff4d8d0000)
        libldap-2.5.so.0 => /lib/aarch64-linux-gnu/libldap-2.5.so.0 (0x00007fff4d850000)
        liblber-2.5.so.0 => /lib/aarch64-linux-gnu/liblber-2.5.so.0 (0x00007fff4d820000)
        libzstd.so.1 => /lib/aarch64-linux-gnu/libzstd.so.1 (0x00007fff4d760000)
        libbrotlidec.so.1 => /lib/aarch64-linux-gnu/libbrotlidec.so.1 (0x00007fff4d730000)
        /lib/ld-linux-aarch64.so.1 (0x00007fff4e318000)
        libunistring.so.2 => /lib/aarch64-linux-gnu/libunistring.so.2 (0x00007fff4d560000)
        libgnutls.so.30 => /lib/aarch64-linux-gnu/libgnutls.so.30 (0x00007fff4d310000)
        libhogweed.so.6 => /lib/aarch64-linux-gnu/libhogweed.so.6 (0x00007fff4d2a0000)
        libnettle.so.8 => /lib/aarch64-linux-gnu/libnettle.so.8 (0x00007fff4d230000)
        libgmp.so.10 => /lib/aarch64-linux-gnu/libgmp.so.10 (0x00007fff4d190000)
        libkrb5.so.3 => /lib/aarch64-linux-gnu/libkrb5.so.3 (0x00007fff4d0a0000)
        libk5crypto.so.3 => /lib/aarch64-linux-gnu/libk5crypto.so.3 (0x00007fff4d050000)
        libcom_err.so.2 => /lib/aarch64-linux-gnu/libcom_err.so.2 (0x00007fff4d020000)
        libkrb5support.so.0 => /lib/aarch64-linux-gnu/libkrb5support.so.0 (0x00007fff4cff0000)
        libsasl2.so.2 => /lib/aarch64-linux-gnu/libsasl2.so.2 (0x00007fff4cfb0000)
        libbrotlicommon.so.1 => /lib/aarch64-linux-gnu/libbrotlicommon.so.1 (0x00007fff4cf70000)
        libp11-kit.so.0 => /lib/aarch64-linux-gnu/libp11-kit.so.0 (0x00007fff4ce20000)
        libtasn1.so.6 => /lib/aarch64-linux-gnu/libtasn1.so.6 (0x00007fff4cde0000)
        libkeyutils.so.1 => /lib/aarch64-linux-gnu/libkeyutils.so.1 (0x00007fff4cdb0000)
        libresolv.so.2 => /lib/aarch64-linux-gnu/libresolv.so.2 (0x00007fff4cd80000)
        libffi.so.8 => /lib/aarch64-linux-gnu/libffi.so.8 (0x00007fff4cd50000)  

I do see

/usr/lib/aarch64-linux-gnu/libcurl.so.4
/usr/lib/aarch64-linux-gnu/pkgconfig/libcurl.pc
/usr/lib/aarch64-linux-gnu/libcurl-gnutls.so.4
/usr/lib/aarch64-linux-gnu/libcurl.a
/usr/lib/aarch64-linux-gnu/libcurl.so
/usr/lib/aarch64-linux-gnu/libcurl-gnutls.a
/usr/lib/aarch64-linux-gnu/libcurl.so.4.8.0
/usr/lib/aarch64-linux-gnu/libcurl-gnutls.so
/usr/lib/aarch64-linux-gnu/libcurl-gnutls.so.4.8.0
/usr/lib/aarch64-linux-gnu/libcurl-gnutls.so.3
/usr/local/lib/libcurl.so.4
/usr/local/lib/pkgconfig/libcurl.pc
/usr/local/lib/libcurl.a
/usr/local/lib/libcurl.so
/usr/local/lib/libcurl.so.4.8.0
/usr/local/lib/libcurl.la

curl is in /usr/local/bin/curl

Sorry, what do I do with the LDFLAGS? How do I use that?

Does compiling curl compile libcurl too? Should I delete one set of the libcurls and recompile curl?

[jay]

It looks like you still have a packaged libcurl installed and that is probably needed by your distro. I wouldn't try to remove that libcurl. Instead, I would do what I suggested earlier and rebuild curl to use the runpath that loads the correct version of the library.

Sorry, what do I do with the LDFLAGS? How do I use that?

Just as I showed you. Specify it as an environment variable by putting it before the configure command. For example:

LDFLAGS="-Wl,--enable-new-dtags -Wl,-rpath,/usr/local/lib" ./configure --with-openssl --prefix=/usr/local

Does compiling curl compile libcurl too?

yes

[p1r473]

Thanks very much and appreciate the patience
I tried to configure it like that:

wget -O /home/pi/curl-8.7.1.tar.gz https://github.com/curl/curl/releases/download/curl-8_7_1/curl-8.7.1.tar.gz
tar -xzf /home/pi/curl-8.7.1.tar.gz  -C /home/pi
cd /home/pi/curl-8.7.1
LDFLAGS="-Wl,--enable-new-dtags -Wl,-rpath,/usr/local/lib" ./configure --with-openssl --prefix=/usr/local
make
make install

But same warning:

curl 8.7.1 (aarch64-unknown-linux-gnu) libcurl/7.88.1 OpenSSL/3.0.11 zlib/1.2.13 brotli/1.0.9 zstd/1.5.4 libidn2/2.3.3 libpsl/0.21.2 (+libidn2/2.3.3) libssh2/1.10.0 nghttp2/1.52.0 librtmp/2.3 OpenLDAP/2.5.13
Release-Date: 2024-03-27
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HSTS HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM NTLM_WB PSL SPNEGO SSL threadsafe TLS-SRP UnixSockets zstd
WARNING: curl and libcurl versions do not match. Functionality may be affected. 

I also tried rm /usr/local/lib/libcurl* before recompiling but it didnt help

[jay]

what is the output of

objdump -x /usr/local/lib/libcurl.so | grep -E '(RPATH|RUNPATH)'
objdump -x /usr/local/bin/curl | grep -E '(RPATH|RUNPATH)'

[p1r473]

I got it- was a PEBKAC error! thanks :)
Had a typo :)
Thank you so much for your help Jay!