Compiling under Digital Unix

I tried a compilation of R-0.62.1 on a DEC Alpha that identifies
itself as
 Digital UNIX V4.0A  (Rev. 464); Thu May 14 14:08:00 CDT 1998 
 $ uname -a
 OSF1 atlas.stat.wisc.edu V4.0 464 alpha

I got to the final link step then got an error with 
 gcc -ieee_with_inexact -g -O2 -I../include -c version.c
 f77  -o R.binary arithmetic.o array.o attrib.o bind.o builtin.o character.o coerce.o colors.o complex.o context.o cov.o cum.o debug.o deparse.o deriv.o devices.o dotcode.o dstruct.o duplicate.o envir.o errors.o eval.o format.o fourier.o iosupport.o gram.o list.o logic.o main.o match.o memory.o model.o names.o objects.o optimize.o options.o par.o paste.o plot.o plot3d.o plotmath.o print.o printarray.o printvector.o printutils.o random.o relop.o saveload.o scan.o seq.o sort.o source.o split.o subassign.o subscript.o subset.o summary.o unique.o util.o version.o ../lib/libgraphics.a ../lib/libunix.a ../lib/libappl.a ../lib/libmath.a -lSM -lICE -L/s/X11R6.3-1/lib -lX11 -ldnet_stub -ltermcap -lm 
 ld:
 ../lib/libunix.a(system.o): main: multiply defined
 fort: Severe: Failed while trying to link.

Is anyone familiar enough with Digital Unix to decide why it is
defining main in unix/system.o.  I checked and the symbol is indeed
defined there.
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