Problem in OPAM installation

["Yiming Zhang" <sdiris@xxxxxxxxx>]

I encountered a problem during installing OPAM in Ubuntu 1004 (as listed 
below). Can somebody help me figure out the problem? Thanks!

Yiming 
-------------------------
[723.1] BEGIN 'ocamlc.opt' '-c' '-o' '/root/opam/_obuild/723/debcudf.cmo' 
'-for-pack' 'Debian' '-I' './_obuild/dose/Debian' '-I' './_obuild/dose' '-I' 
'./src_ext' '-I' './_obuild/extlib' '-I' './_obuild/cudf' '-I' 
'./_obuild/graph' '-I' './_obuild/re_perl' '-I' '.' '-pp' 'camlp4o 
Camlp4MacroParser.cmo' 'src_ext/dose/deb/debcudf.ml'
[723.1]   END ocamlc.opt -c -o /root/opam/_obuild/723/debcudf.cmo -for-pack 
Debian -I ./_obuild/dose/Debian -I ./_obuild/dose -I ./src_ext -I 
./_obuild/extlib -I ./_obuild/cudf -I ./_obuild/graph -I ./_obuild/re_perl -I . 
-pp camlp4o Camlp4MacroParser.cmo src_ext/dose/deb/debcudf.ml
Command stderr:
File "src_ext/dose/deb/debcudf.ml", line 194, characters 13-26:
Error: Unbound value SMap.bindings
[723.1] ERROR in project dose
Error, exception Unix_error(No such file or directory, stat, 
_obuild/dose/Debian/debcudf.cmo) in rule_executed
Warning: 380 rules waiting in queue !
2 errors. 429 commands executed, 561 files generated.
Error:
Target _obuild/dose/Debian/debcudf.cmo not built
Error:
[723.1] ocamlc.opt -c -o /root/opam/_obuild/723/debcudf.cmo -for-pack Debian -I 
./_obuild/dose/Debian -I ./_obuild/dose -I ./src_ext -I ./_obuild/extlib -I 
./_obuild/cudf -I ./_obuild/graph -I ./_obuild/re_perl -I . -pp camlp4o 
Camlp4MacroParser.cmo src_ext/dose/deb/debcudf.ml
File "src_ext/dose/deb/debcudf.ml", line 194, characters 13-26:
Error: Unbound value SMap.bindings