Compared to OS X LibEdit, Readline provides better support for interactive work
and enables functionality such as reverse-i search.
ClosesHomebrew/homebrew#7950.
Also ensures the PNG drivers get built for x11 and Cairo graphics devices and
that the Objective C compiler is configured along with other Homebrew
compilers.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
IDEs such as RStudio depend on R.framework being in a certain location, but
the R formula currently doesn't install the framework anywhere. This just
adds a friendly message to remind them that they may want to do so manually.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Also removed the caveat explaining to the user that gfortran is required for
installation as this exact same information is displayed if `which gfortran`
returns empty-handed and is irrelevant if the install succeeded.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>