Problem building latest slrn on raspbian

I built slrn pre1.0.4-2 and have been using it with no problems. I'm
having problems trying to build the latest version, but I'm no C
programmer and would like advice.

$ git pull
(no problem)

$ ./configure --with-canlock --with-ssl --with-uu
(output looks OK --- those are the configure options I used last time)

$ make
...
/usr/bin/ld: server.o: in function `alloc_ssl':
/home/adam/software/slrn/src/sltcp.c:566: undefined reference to `SSL_library_init'
/usr/bin/ld: /home/adam/software/slrn/src/sltcp.c:567: undefined reference to `SSLv23_client_method'
/usr/bin/ld: /home/adam/software/slrn/src/sltcp.c:569: undefined reference to `SSL_load_error_strings'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:120: /home/adam/software/slrn/src/objs/slrn] Error 1
make[1]: Leaving directory '/home/adam/software/slrn/src'
make: *** [Makefile:8: all] Error 2


These are the SSL packages installed:

libssl-dev:armhf             1.1.1d-0+deb10u6+rpt1 armhf
libssl1.0.0:armhf            1.0.1t-1+deb8u7       armhf
libssl1.1:armhf              1.1.1d-0+deb10u6+rpt1 armhf
openssl                      1.1.1d-0+deb10u6+rpt1 armhf


Thanks!