Firstly I omitted the following information from my original message:
R is now configured for i386--netbsdelf
  Source directory:          .
  Installation directory:    /usr/pkg
  C compiler:                cc  -mieee-fp
-I/mnt/scratch/pkgsrc/math/R/work.i386/.buildlink/include -O2
-I/usr/pkg/share/x11-links/include
  C++ compiler:              c++  -mieee-fp
-I/mnt/scratch/pkgsrc/math/R/work.i386/.buildlink/include
-I/mnt/scratch/pkgsrc/math/R/work.i386/.buildlink/include -O2
-I/usr/pkg/share/x11-links/include
  FORTRAN compiler:         
/mnt/scratch/pkgsrc/math/R/work.i386/.buildlink/bin/f2c-f77 -O
  X11 support:               yes
  Gnome support:             no
  Tcl/Tk support:            yes
  Readline support:          yes
  R profiling support:       yes
  R as a shared library:     no
Secondly, a workaround patch is the following:
--- src/main/unzip.h.orig       Mon Feb  4 11:48:57 2002
+++ src/main/unzip.h
@@ -49,6 +49,16 @@
 #include "zlib.h"
 #endif
 
+/* Fudge for NetBSD's replacement of OF by __P in zconf.h */
+
+#ifndef OF /* function prototypes */
+#  ifdef STDC
+#    define OF(args)  args
+#  else
+#    define OF(args)  ()
+#  endif
+#endif
+
 #if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
 /* like the STRICT of WIN32, we define a pointer that cannot be converted
     from (void*) without cast */
Ray Brownrigg
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