Using the new beta from context-minimal

This is LuaTeX, Version beta-0.75.0-2013030308 (rev 4589)
 \write18 enabled.
(/Users/jin/pkgs/ConTeXt/tex/texmf-context/tex/context/base/cont-yes.mkiv

ConTeXt  ver: 2013.03.20 21:07 MKIV  fmt: 2013.3.21  int: english/english

system          > 'cont-new.mkiv' loaded
(/Users/jin/pkgs/ConTeXt/tex/texmf-context/tex/context/base/cont-new.mkiv
system          > beware: some patches loaded from cont-new.mkiv
)
system          > files > jobname 'bulk_trans', input 'bulk_trans', result
'bulk_trans'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
(bulk_trans.tex
resolvers       > modules > 'gnuplot' is loaded
(/Users/jin/pkgs/ConTeXt/tex/texmf-modules/tex/context/third/gnuplot/t-gnuplot.tex
loading         > Gnuplot module
! Undefined control sequence.
log
system          > tex > error on line 99 in file
/Users/jin/pkgs/ConTeXt/tex/texmf-modules/tex/context/third/gnuplot/t-gnuplot.tex:
Undefined control sequence ...


<argument> ...:= \@@GNUPLOT@term@context@linejoin
                                                  ; gp_use_dashed :=
\@@GNUP...
\meta_start_extensions ...extensions("#1",\!!bs #2
                                                  \!!es )}
l.99 \stopMPextensions

?

This happens with context running on a file generated by gnuplot 4.6.1.  I
have been using context in the texlive 2012 without any problem.