Checking if your kit is complete...
Looks good
Writing Makefile for Device::Davis
cp Davis.pm blib/lib/Device/Davis.pm
AutoSplitting blib/lib/Device/Davis.pm (blib/lib/auto/Device/Davis)
/export/home/cpanrun/build/5.6.1/bin/perl -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi -I/export/home/cpanrun/build/5.6.1/lib/5.6.1 /export/home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /export/home/cpanrun/build/5.6.1/lib/5.6.1/ExtUtils/typemap Davis.xs > Davis.xsc && mv Davis.xsc Davis.c
Please specify prototyping behavior for Davis.xs (see perlxs manual)
gcc -c  -DUSE_REENTRANT_API -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -fno-strict-aliasing -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O   -DVERSION=\"1.2.1\" -DXS_VERSION=\"1.2.1\" -fPIC -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi/CORE  Davis.c
Running Mkbootstrap for Device::Davis ()
chmod 644 Davis.bs
rm -f blib/arch/auto/Device/Davis/Davis.so
LD_RUN_PATH="" gcc  -G Davis.o  -o blib/arch/auto/Device/Davis/Davis.so     
chmod 755 blib/arch/auto/Device/Davis/Davis.so
cp Davis.bs blib/arch/auto/Device/Davis/Davis.bs
chmod 644 blib/arch/auto/Device/Davis/Davis.bs
Manifying blib/man3/Device::Davis.3
PERL_DL_NONLAZY=1 /export/home/cpanrun/build/5.6.1/bin/perl -Iblib/arch -Iblib/lib -I/export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi -I/export/home/cpanrun/build/5.6.1/lib/5.6.1 test.pl
1..4
Can't load 'blib/arch/auto/Device/Davis/Davis.so' for module Device::Davis: ld.so.1: /export/home/cpanrun/build/5.6.1/bin/perl: fatal: relocation error: file blib/arch/auto/Device/Davis/Davis.so: symbol cfsetspeed: referenced symbol not found at /export/home/cpanrun/build/5.6.1/lib/5.6.1/sun4-solaris-thread-multi/DynaLoader.pm line 206.
Compilation failed in require at test.pl line 11.
BEGIN failed--compilation aborted at test.pl line 11.
make: *** [test_dynamic] Error 255