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fork log file (build_win64)

Fri Aug 12 19:52:16 2016: Building binary for package fork (SVN revision 2135)
using R version 3.3.1 Patched (2016-08-10 r71074) ...

* installing to library 'R:/lib/local/3.3'
* installing *source* package 'fork' ...
** libs

*** arch - i386
c:/Rtools/mingw_32/bin/gcc  -I"R:/lib/R/R-patched/include" -DNDEBUG     -I"R:/base/local215/include"     -O3 -Wall  -std=gnu99 -mtune=core2 -c fork.c -o fork.o
fork.c:12:22: fatal error: sys/wait.h: No such file or directory
 #include 
                      ^
compilation terminated.
make: *** [fork.o] Error 1
Warning: running command 'make -f "R:/lib/R/R-patched/etc/i386/Makeconf" -f "R:/lib/R/R-patched/etc/i386/Makevars.site" -f "R:/lib/R/R-patched/share/make/winshlib.mk" SHLIB="fork.dll" OBJECTS="fork.o sigchld_handler.o"' had status 2
ERROR: compilation failed for package 'fork'
* removing 'R:/lib/local/3.3/fork'
Run time: 0.77 seconds.