Unable to build samba alpha 21 on SunOS5.10

[Constantin Vultur]

 Hello,

We are trying to build the latest samba alpha version (samba-4.0.0alpha21) on a SunOS5.10 machine but are encountering the following linkage error:
Undefined                       first referenced
symbol                             in file
rep_vasprintf                      
 default/source4/heimdal/lib/roken/strpool_5.o
rep_snprintf                        default/source4/heimdal/lib/roken/getarg_5.o
rep_asprintf                        default/source4/heimdal/lib/asn1/gen_134.o
ld: fatal: Symbol referencing errors. No output written to /tmp/samba-4.0.0alpha21/bin/default/source4/heimdal_build/asn1_compile
collect2: ld returned 1 exit status
Waf: Leaving directory `/tmp/samba-4.0.0alpha21/bin'
Build failed:  -> task failed (err #1):
        {task: cc_link
 base64_5.o,ct_5.o,hex_5.o,bswap_5.o,dumpdata_5.o,emalloc_5.o,ecalloc_5.o,getarg_5.o,get_window_size_5.o,getdtablesize_5.o,h_errno_5.o,issuid_5.o,net_read_5.o,net_write_5.o,parse_time_5.o,parse_units_5.o,vis_5.o,strlwr_5.o,strsep_copy_5.o,strsep_5.o,strupr_5.o,strpool_5.o,estrdup_5.o,erealloc_5.o,simple_exec_5.o,strcollect_5.o,rtbl_5.o,rand_5.o,cloexec_5.o,xfree_5.o,replace_5.o,print_version_132.o,version_132.o,main_134.o,gen_134.o,gen_copy_134.o,gen_decode_134.o,gen_encode_134.o,gen_free_134.o,gen_glue_134.o,gen_length_134.o,gen_seq_134.o,gen_template_134.o,hash_134.o,symbol_134.o,asn1parse_134.o,lex_134.o,strptime_1.o,replace_1.o,timegm_1.o -> asn1_compile}
make: *** [all] Error 1

Thank you in advance for any help.

Costi