Hi, Corion. Yes, the libraries are all needed. I didn't want to overload the thread with too much information, but after the perl Makefile.PL shown above, the output of make is: 
$ make
cp SimpleServer.pm blib/lib/Net/Z3950/SimpleServer.pm
AutoSplitting blib/lib/Net/Z3950/SimpleServer.pm (blib/lib/auto/Net/Z3
+950/SimpleServer)
cp logging-server.pl blib/lib/Net/Z3950/logging-server.pl
cp grs_test.pl blib/lib/Net/Z3950/grs_test.pl
cp OID.pm blib/lib/Net/Z3950/OID.pm
cp GRS1.pm blib/lib/Net/Z3950/GRS1.pm
cp ztest.pl blib/lib/Net/Z3950/ztest.pl
Running Mkbootstrap for SimpleServer ()
chmod 644 "SimpleServer.bs"
"/usr/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- SimpleServ
+er.bs blib/arch/auto/Net/Z3950/SimpleServer/SimpleServer.bs 644
"/usr/bin/perl" "/System/Library/Perl/5.30/ExtUtils/xsubpp"  -typemap 
+'/System/Library/Perl/5.30/ExtUtils/typemap'  SimpleServer.xs > Simpl
+eServer.xsc
mv SimpleServer.xsc SimpleServer.c
cc -c  -I/usr/local/Cellar/yaz/5.34.0_2/include -DYAZ_POSIX_THREADS=1 
+-DYAZ_HAVE_XML2=1 -DYAZ_HAVE_XSLT=1 -DYAZ_HAVE_EXSLT=1 -g -pipe -DPER
+L_USE_SAFE_PUTENV -Os   -DVERSION=\"1.28\" -DXS_VERSION=\"1.28\"  -iw
+ithsysroot "/System/Library/Perl/5.30/darwin-thread-multi-2level/CORE
+"   SimpleServer.c
rm -f blib/arch/auto/Net/Z3950/SimpleServer/SimpleServer.bundle
LD_RUN_PATH="/usr/local/Cellar/yaz/5.34.0_2/lib" cc  -bundle -undefine
+d dynamic_lookup  SimpleServer.o  -o blib/arch/auto/Net/Z3950/SimpleS
+erver/SimpleServer.bundle  \
       -L/usr/local/Cellar/yaz/5.34.0_2/lib -lyaz_server -lyaz   \
      
ld: warning: -undefined dynamic_lookup may not work with chained fixup
+s
chmod 755 blib/arch/auto/Net/Z3950/SimpleServer/SimpleServer.bundle
Manifying 2 pod documents

[download]
So the issue potential here is if course the -undefined dynamic_lookup warning. Again, at the time it seems benign. And it's not clear whether it's related to the "mostly harmless" warnings, but obvious both pertain to linking.

In reply to Re^4: Warning (mostly harmless): No library found for -lxml2 by MikeTaylor
in thread Warning (mostly harmless): No library found for -lxml2 by MikeTaylor

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