Hello Hans, in tex.rb you pass the option -8bit to mpost. That option is (apparently - I have not tested, but see the list at the bottom) not available on MikTeX 2.7. I have no idea when this switch is needed and if there is any replacement for it, but it would be nice to fix the script in one way or another. Apparently this mechanism is going to change really soon anyway :), but for MikTeX it means waiting for the next version, so it might make sense to fix that and upload the fixed version to CTAN. (As far as I know, MikTeX is the only and the most important "user" of ConTeXt from CTAN, and it makes sense to keep some compromise of recent vs. stable version there.) Thanks, Mojca Here's an email sent to the MikTeX mailing list: On Sat, Mar 29, 2008 at 11:57 AM, wrote:

Dear all,

We are using MiKTeX 2.7 and ConTeXt and we are experiencing a bug during the interaction of ConTeXt and metapost. Namely, the wrapper script texexec ends the run by noting the following error:

mpost: Invalid command-line option

Compiling with mpost directly the (on the fly created) jobname-mpgraph.mp file works properly. This bug seems to have slept into 2.7 after the fix of the ConTeXt package some weeks ago...

Is this a known bug? Below is a minimal sample file with which the bug occurs. Is there an easy fix?

Thanks for your help, Olivier

%--------------- sample file --------------------------

\starttext

\startreusableMPgraphic{symb-circle-oo} numeric u; u=1.8pt; fill ((0,0)..(0,3u)..(3u,3u)..(3u,0)..cycle); \stopreusableMPgraphic \reuseMPgraphic{symb-circle-oo}

\stoptext

-------------------------------------------------------------------------

Usage: mpost [OPTION...] [COMMAND...] -alias=APP Pretend to be APP. This affects both the format used and the search path. -aux-directory=DIR Use DIR as the directory to write auxiliary files to. -bistack-size=N Set bistack_size to N. -buf-size=N Set buf_size to N. -c-style-errors Enable file:line:error style messages. -disable-installer Disable the package installer. Missing files will not be installed. -disable-pipes Disable input (output) from (to) processes. -dont-parse-first-line Do not parse the first line of the input line to look for a dump name and/or extra command-line options. -enable-installer Enable the package installer. Missing files will be installed. -enable-pipes Enable input (output) from (to) processes. -error-line=N Set error_line to N. -extra-mem-top=N Set extra_mem_top to N. -font-mem-size=N Set font_mem_size to N. -half-error-line=N Set half_error_line to N. -halt-on-error Stop after the first error. -help Show this help screen and exit. -hhelp Show the manual page in an HTMLHelp window and exit when the window is closed. -include-directory=DIR Prefix DIR to the input search path. -initialize Be the INI variant of the program. -interaction=MODE Set the interaction mode; MODE must be one of: batchmode, nonstopmode, scrollmode, errorstopmode. -job-name=NAME Set the job name and hence the name(s) of the output file(s). -job-time=FILE Set the job time. Take FILE's timestamp as the reference. -lig-table-size=N Set lig_table_size to N. -main-memory=N Set main_memory to N. -max-print-line=N Set max_print_line to N. -max-strings=N Set max_strings to N. -no-c-style-errors Disable file:line:error style messages. -output-directory=DIR Use DIR as the directory to write output files to. -param-size=N Set param_size to N. -parse-first-line Parse the first line of the input line to look for a dump name and/or extra command-line options. -path-size=N Set path_size to N. -pool-size=N Set pool_size to N. -quiet Suppress all output (except errors). -record-package-usages=FILE Enable the package usage recorder. Output is written to FILE. -recorder Turn on the file name recorder to leave a trace of the files opened for input and output in a file with extension .fls. -stack-size=N Set stack_size to N. -string-vacancies=N Set string_vacancies to N. -tcx=TCXNAME Use the TCXNAME translation table to set the mapping of inputcharacters and re-mapping of output characters. -tex=TEXPROGRAM Use TEXPROGRAM for text labels. -time-statistics Show processing time statistics. -trace=OPTIONS Turn tracing on. OPTIONS must be a comma-separated list of trace options. See the manual, for more information. -undump=NAME Use NAME instead of program name when loading internal tables. -version Print version information and exit.