New autoconf attempts to compile the headers as part of AC_HEADER_CHECK.
It AC_PROG_CC is not called then AC_HEADER_CHECK generates scary warning -
just call AC_PROG_CC unconditionally: it will honour CC from the environment
but it will also do the right things about later checks.
On Solaris if the alternative compiler is not GCC then don't feed it
GNU options.
Allow user to choose her compiler
New autoconf attempts to compile the headers as part of AC_HEADER_CHECK.
It AC_PROG_CC is not called then AC_HEADER_CHECK generates scary warning -
just call AC_PROG_CC unconditionally: it will honour CC from the environment
but it will also do the right things about later checks.
On Solaris if the alternative compiler is not GCC then don't feed it
GNU options.