[Rd] cannot compile on solaris

[Erich Neuwirth]

on my old sun ipx with gcc and texinfo installed 
u run ./configure ok, and then i get

[szego@neuwirth:/install/R-1.0.0] make
make[1]: Entering directory `/install/R-1.0.0/tools'
make[1]: Nothing to be done for `R'.
make[1]: Leaving directory `/install/R-1.0.0/tools'
make[1]: Entering directory `/install/R-1.0.0/afm'
make[1]: Leaving directory `/install/R-1.0.0/afm'
make[1]: Entering directory `/install/R-1.0.0/doc'
false: false: cannot open
make[1]: *** [R] Error 1
make[1]: Leaving directory `/install/R-1.0.0/doc'
make: *** [R] Error 1

what is happening?
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