version.h is not being installed by "make install"
ruby 1.9.1p0 (2009-01-30 revision 21907) [ia64-hpux11.23]
Under 1.8.x, the version.h file used to be installed into /lib/ruby/1.8//version.h
This is useful for gems that have version specific code.
However this file is not installed when compiling 1.9.1p0.