gnutls/gnutls.h: No such file or directory while installing latest cups 2.3.3

[deltasata]

I am trying to install the latest version of cups 2.3.3, I was following https://fossies.org/linux/cups/INSTALL.md

After the make command, I got the foll error.

In file included from cups-private.h:21:0,
                 from auth.c:17:
http-private.h:70:14: fatal error: gnutls/gnutls.h: No such file or directory
 #    include <gnutls/gnutls.h>
              ^~~~~~~~~~~~~~~~~
compilation terminated.
make[1]: *** [../Makedefs:271: auth.o] Error 1

Note that I followed the step

sudo apt-get install autoconf build-essential libavahi-client-dev \
     libgnutls28-dev libkrb5-dev libnss-mdns libpam-dev \
     libsystemd-dev libusb-1.0-0-dev zlib1g-dev

before going to make

Most frustratingly, /usr/include/gnutls/gnutls.h is there but still I am getting this error.
Tried on a different computer with ubuntu 20.04 and got the same error despite having /usr/include/gnutls/gnutls.h.

[michaelrsweet]

@deltasata I'm not sure what is going on. Have you tried building the current OpenPrinting CUPS release(2.3.3op2) instead? It is possible there is an issue with the configure script, or maybe you are cross-compiling so /usr/include isn't in the list of include directories?