[Rd] configure bug in R-1.2.1 and earlier (PR#836)

[lhecking@nmrc.ie]

 Unless I force the Fortran compiler through --with-g77, configure fails to
 find and use the installed g77. I would submit a patch for configure.in,
 but I can't quite follow the logic in configure.in.

$ ./configure 
creating cache ./config.cache
[...]
checking for main in -lm... yes
checking for g77... /usr/local/gnu/bin/g77
checking for fort77... (cached) /usr/local/gnu/bin/g77
checking for f77... (cached) /usr/local/gnu/bin/g77
checking for f90... (cached) /usr/local/gnu/bin/g77
checking for xlf... (cached) /usr/local/gnu/bin/g77
checking for cf77... (cached) /usr/local/gnu/bin/g77
checking for fc... (cached) /usr/local/gnu/bin/g77
checking for f2c... no
configure: error: Neither an F77 compiler nor f2c found
$ 


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