[Rd] Rtools version 3.3.0.1957 looking for C even though RTOOLS variable is pointing elsewhere

[Avraham Adler]

The following changes may be responsible:

src\gnuwin32\fixed\Makefile lines 31 and 47 where version 9 has '-e
"s|BINPREF =|BINPREF = $(BINPREF)|" \' and version 10 has '-e
's|BINPREF =|BINPREF ?= $$(RTOOLS)gcc492_64/bin/|' \'.

Or, it may have been the addition of "RTOOLS ?= C:/Rtools/" on line 17
of src\gnuwin32\fixed\etc\Makeconf in version 10.

There are 31 other files with differences, but they do not seem to have bearing.

Thank you,

Avi