Like tommyw it works fine for me as well (same version of Perl but different version of Solaris):

Running make test
PERL_DL_NONLAZY=1 /usr/bin/perl -Iblib/arch -Iblib/lib -I/usr/lib/perl
+5/5.6.1/sun4-solaris -I/usr/lib/perl5/5.6.1 -e 'use Test::Harness qw(
+&runtests $verbose); $verbose=0; runtests @ARGV;' t/*.t
t/cookie............ok                                                
+       
t/function..........ok                                                
+       
t/request...........ok                                                
+       
t/simple............ok                                                
+       
t/standard..........ok                                                
+       
t/util..............ok                                                
+       
All tests successful.
Files=6, Tests=839, 13 wallclock secs ( 3.52 cusr +  0.31 csys =  3.83
+ CPU)
  /usr/ccs/bin/make test -- OK
[download]

Information about Perl:

Summary of my perl5 (revision 5.0 version 6 subversion 1) configuratio
+n:
  Platform:
    osname=solaris, osvers=2.6, archname=sun4-solaris
    uname='sunos ouessant 5.6 generic_105181-31 sun4u sparc sunw,ultra
+-4 '
    config_args=''
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultipl
+icity=undef
    useperlio=undef d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
  Compiler:
    cc='gcc', ccflags ='-I/usr/local/include -D_LARGEFILE_SOURCE -D_FI
+LE_OFFSET_BITS=64',
    optimize='-O',
    cppflags='-I/usr/local/include'
    ccversion='', gccversion='2.8.1', gccosandvers='solaris2.6'
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=4321
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=1
+6
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
+ lseeksize=8
    alignbytes=8, usemymalloc=y, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib '
    libpth=/usr/local/lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc
    perllibs=-lsocket -lnsl -ldl -lm -lc
    libc=/lib/libc.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'


Characteristics of this binary (from libperl): 
  Compile-time options: USE_LARGE_FILES
[download]

Is the error with 5.6.0? I utterly failed to install cpanplus on 5.6.0, which was why I finally installed 5.6.1 a few months ago (and yes, upgrading fixed the problem). The reason for failure was deep inside LWP::Request. Does that set off warning bells? Either that, or maybe you fixed the error without realising it :)

print@_{sort keys %_},$/if%_=split//,'= & *a?b:e\f/h^h!j+n,o@o;r$s-t%t#u'

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