Adding addition args to CFLAGS and CXXFLAGS

Hi,

This there a way I can append additional -D args to the
CFLAGS and CXXFLAGS when I first ./configure bro to build ?

There is a comment in ./configure --help I don’t understand:

Influential Environment Variables (only on first invocation
per build directory):
CC C compiler command
CFLAGS C compiler flags
CXX C++ compiler command
CXXFLAGS C++ compiler flags

As an example, this should prepend to the default set of flags:

  CXXFLAGS="-DMYDEFINITION" CFLAGS="-DMYDEFINITION" ./configure

- Jon