$ uname -a
Minix myminix.example.com 3.3.0 Minix 3.3.0 (GENERIC) i386

$ CC=clang ./configure
ngIRCd 23 has been configured with the following options:

               Host: i386-pc-minix
           Compiler: clang
     Compiler flags: -g -O2 -pipe -W -Wall -Wpointer-arith -Wstrict-prototypes -fstack-protector -DSYSCONFDIR='"$(sysconfdir)"' -DDOCDIR='"$(docdir)"'
          Libraries: -lz 

    'ngircd' binary: /usr/local/sbin
 Configuration file: /usr/local/etc
       Manual pages: /usr/local/share/man
      Documentation: /usr/local/share/doc/ngircd

     Syslog support: yes     Enable debug code: no
   zlib compression: yes           IRC sniffer: no
   Use TCP Wrappers: no        Strict RFC mode: no
      IDENT support: no          IRC+ protocol: yes
      IPv6 protocol: no            I/O backend: poll()
        PAM support: no            SSL support: no
   libiconv support: no


clang: warning: argument unused during compilation: '-g'
platformtest.sh: Running "make check" ...
clang: warning: argument unused during compilation: '-g'

                                the executable works ("runs") as expected --+
                                  tests run successfully ("make check") --+ |
                                             ngIRCd compiles ("make") --+ | |
                                                  ./configure works --+ | | |
                                                                      | | | |
Platform                    Compiler     ngIRCd     Date     Tester   C M T R *
--------------------------- ------------ ---------- -------- -------- - - - - -
i386/pc/minix               clang 3.4    23         16-01-06 goetz    Y Y N Y

Can’t get through configure with lcc or pcc, though …