[R] Unable to make bitmapdll files on windows 7 64 bit machine

[arnholtat at appstate.edu]

I am trying to build a windows 32 bit version of R 2.11.0 from source on a machine running
 windows 7 - 64 bit while running as the machine's administrator.
I am able to run "make all recommended"...However, once I attempt to build the bitmap files I get the following:

C:\Rsource\R-2.11.0\src\gnuwin32>make bitmapdll
make -C bitmap
make[1]: Entering directory `/cygdrive/c/Rsource/R-2.11.0/src/gnuwin32/bitmap'
make CC='gcc -std=gnu99' AR='ar' \
  CFLAGS="-O3 -I../../../extra/zlib -DPNG_NO_MMX_CODE" \
  RANLIB=ranlib ZLIBLIB=../../../extra/zlib -C libpng \
  -f scripts/makefile.mingw prefix=foo libpng.a
gcc -std=gnu99 -c -O3 -I../../../extra/zlib -DPNG_NO_MMX_CODE -o png.o png.c
Assembler messages:
Fatal error: can't create png.o: Permission denied
make[3]: *** [png.o] Error 1
make[2]: *** [buildpng] Error 2
make[1]: *** [all] Error 2
make[1]: Leaving directory `/cygdrive/c/Rsource/R-2.11.0/src/gnuwin32/bitmap'
make: *** [bitmapdll] Error 2

Any suggestions/hints on what I am messing up are most appreciated.  

Thanks in advance.

Alan-

Alan T. Arnholt
Professor and Assistant Chair
Department of Mathematical Sciences
Appalachian State University
T:(828)262-2863
F:(828)265-8617
http://www1.appstate.edu/~arnholta/