Daniel R. Gomez authored Jun 18, 2012 and Brad King committed Jun 19, 2012

Use CXXFLAGS in the makefile's link rule since it invokes the C++
compiler front-end.  Retool the makefile not to require GNU Make.  Using
backticks instead of $(shell ...) is safe so long as one guards against
the possibility of backslashes getting inside the backticks, so use
temporary files and shell variables to avoid them.