Testing for a library with $CXX (instead of $CC)

[F Labrosse]

Hi all,

Is it possible to test for a library using $CXX instead of $CC?  My problem 
is that on a Solaris box, some libraries won't link with cc while they do
with CC (e.g. qt).

Or is it better to set $CC to CC (instead of having $CC=cc and $CXX=CC).

TIA,

Fred