I just tried to build menhir and failed at it. Maybe the bug is on my 
side, because I do not exactly do everything by the book. My 
installation is mingw over Win2k, ocaml-3.09-0, however, it is a custom 
build over native msys, no cygwin whatsoever involved. This was not an 
issue for the last few years - I am maintaining an ocaml line for this 
platform just for fun ever since I learned about msys. I would 
understand if you did not consider this issue to be too urgent, 
appearing on an unsupported platform etc. but I thought it may be 
something more generic, so here you go:

The output is the following:

$ ./configure
checking for ocamlc.opt... no
checking for ocamlc... ocamlc
checking the version of the ocaml bytecode compiler.... 3.09.0
checking for ocamlopt.opt... no
checking for ocamlopt... ocamlopt
checking the version of the ocaml native compiler.... 3.09.0
checking for ocamldep.opt... no
checking for ocamldep... ocamldep
checking for ocamlyacc... ocamlyacc
checking for ocamllex... ocamllex
checking for a BSD-compatible install... /bin/install -c
configure: creating ./config.status
config.status: creating Makefile

$ make install
make - --unix -s PGEN="ocamlyacc -v" PARSER=parser EXECUTABLE=stage-one 
executab
les
77 states, 5444 transitions, table size 22238 bytes
18222 additional bytes used for bindings
243 states, 3079 transitions, table size 13774 bytes
10161 additional bytes used for bindings
5 states, 258 transitions, table size 1062 bytes
23 states, 1876 transitions, table size 7642 bytes
1209 additional bytes used for bindings
make - --unix -s PGEN="./stage-one -v -lg 1 -la 1 -lc 1 --comment 
--infer --erro
r-recovery --stdlib ." PARSER=fancy-parser EXECUTABLE=menhir executables
I/O error: Invalid argument
Fatal error: exception Sys_error("Invalid argument")
make[1]: *** [parser.mli] Error 1
make: *** [bootstrap] Error 2

$


Regards

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