Digital fortran 6.6 unrecognized under NT and Cygwin

[Xiaowen Wang]

Hi:
I'm porting a unix app to win32. The app works well with autoconf and
automake on linux. In NT and cygwin, I set CC to MSVC C compiler cl.exe
and F77 to Compaq fortran 6.6 compiler df.exe. The configure can not
configure the fortran compiler. 

Here's the relevant portion in configure.ac:

#
# Fortran77 integration
#

# Check link flags. $FLIBS is set to appropriate value
AC_F77_LIBRARY_LDFLAGS
# Check f77 name mangling, F77_FUNC and F77_FUNC_ macros are defined.
AC_F77_WRAPPERS

# Checks the blas library
BLASLIB=""
AC_ARG_WITH(blas, AC_HELP_STRING([--with-blas=xxx],
                  [specify a blas library]),
[
        # first get the appropriate f77 name of function "dgemv"
        AC_F77_FUNC(dgemv, dgemv_f77nm)

        # now check whether it's available in libxxx.a or libxxx.so
        AC_CHECK_LIB($withval, $dgemv_f77nm, 
        [ 
          BLASLIB="-l$withval"
          AC_DEFINE(USE_VENDOR_BLAS, 1, [Use user specified blas])
        ], [], [$FLIBS -lm])

        if test "x$BLASLIB" != "x"; then # found it
           LIBS="$BLASLIB $LIBS"
        fi
], [])

if test "x$BLASLIB" = "x"; then
   AC_MSG_ERROR([blas must be specified])
fi

And here's the last portion of the config output when running
./configure --prefix=/e/nlibs --with-blas=mkl_m
LDFLAGS="-L/e/nlibs/blas"  CC=cl F77=df
:

checking how to get verbose linking output from df.exe... configure:
WARNING: compilation failed

checking for Fortran 77 libraries...
checking for dummy main to link with Fortran 77 libraries... none
checking for Fortran 77 name-mangling scheme...
configure: WARNING: unknown Fortran 77 name-mangling scheme
checking for unknown in -lmkl_m... no
configure: error: blas must be specified
.

Thanks
XW