[Rd] compiling R under cygwin

Denham Robert Robert.Denham at nrw.qld.gov.au
Tue Aug 21 06:30:21 CEST 2007

For various reasons, it suits our workplace to have a cygwin version of
R.  I am pretty sure that cygwin is still not a supported environment
for R, but we have managed to compile R-2.5.1 under cygwin without too
many dramas.  Our procedure is described below.  We still have a few
problems compiling libraries without manually changing files from .so to
.dll, but it seems ok.
I was wondering whether this information is likely to be useful to
others, and if we should spend any time looking in to ways in which the
configure/build/install code could be modified to allow a standard
Notes on building R under cygwin:
export FFLAGS=-O3
export CFLAGS=-O3
export CXXFLAGS=-O3
export OBJCFLAGS=-O3
export FCFLAGS=-O3
export LDFLAGS='-lblas -lg2c -lintl'
export R_OSTYPE=unix
./configure --prefix=/opt/freeware/R/R-2.5.1 \
--with-tcl-config=/usr/lib/tclConfig.sh \
--with-tk-config=/usr/lib/tkConfig.sh \
--with-blas=-lblas \
--with-lapack=-llapack \
comment out Win32 in src/include/config.h and set Unix to 1, change .so
to .dll. change .so to .dll and in Makeconf.
in src/extra/xdr/rpc/types.h comment out defn of malloc.
Change .so to .dll in Makefile's
edit Makeconf and set R_OSTYPE to unix
make -j2
when blas doesn't link, re-run command with -lblas -lg2c on end and
change output to .dll
edit Rstrptime.c and change wcstod to atof.
in modules:
when X11 and internet falls over add -lintl to link line. add -lg2c and
-lblas to lapack
comment out library/base/R/library.R lines 47-51 to avoid arch check
which seems to go wrong!
make -j2
make install
edit  /opt/freeware/R/R-2.5.1/lib/R/etc/Makeconf and add '-lintl -lg2c
-lblas' to the end of ALL_LIBS
so the module building works. Change .so to .dll also
(can't see how to to this for the build tho...)

Our cygwin info is:
             sysname              release              version 
     "CYGWIN_NT-5.1" "1.5.20s(0.155/4/2)"  "20060527 19:21:22" 

Robert Denham
Environmental Statistician
Remote Sensing Centre
Telephone 07 3896 9899 
www.nrw.qld.gov.au <http://www.nrw.qld.gov.au/> 
Department of Natural Resources & Water
QScape Building, 80 Meiers Road, Indooroopilly Qld 4068

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