I'd like to make a request for an additional feature in the G4
environment.

Although the G4 GNUmakefile architecture
($G4INSTALL/config/architecture.gmk and binmake.gmk) are fairly
robust, there are times when it's conventient to compile, link, or
execute programs outside the toolkit's architecture.  It would be
convenient to have a command that would return the text of the
compiler flags and/or linker flags appropriate for a G4 compilation.

An example of this would be the "cernlib" command, which returns the
linker options for a supplied set of libraries.  For example, here's
the result of a sample command on my system:

# cernlib mathlib packlib kernlib
/usr/local/cern/2001/lib/libmathlib.a \
/usr/local/cern/2001/lib/libpacklib.a \
/usr/local/cern/2001/lib/libkernlib.a \
-lnsl -lcrypt -ldl

An even better example is the root-config command in the ROOT
distribution, which has different options for compiling or for
linking:

# root-config --cflags
-D_REENTRANT -I/usr/local/root-03.01.06/include

# root-config --libs
-L/usr/local/root-03.01.06/lib \
-lCore -lCint -lHist -lGraf -lGraf3d -lGpad \
-lTree -lRint -lPostscript -lMatrix -lPhysics \
-lm -ldl -lpthread -rdynamic

A "G4config" command might return the appropriate
installation-dependent options.  The results would depend on, e.g.,
whether the system was installed with shared libraries, or built with
a particular visualization option (since we at Nevis use different
options than those at CERN).

Such a command does not appear to be difficult to write.  If you don't
have the resources to spare right now, I offer to create it myself for
your review.