config.status doesn't put `"' around variable

I got

[hjl@gnu-4 libunwind-0.98]$ ./config.status --recheck
running /bin/sh ./configure  --enable-debug
--host=ia64-redhat-linux-gnu --build=ia64-redhat-linux-gnu
--target=ia64-redhat-linux-gnu --program-prefix= --prefix=/usr
--exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include
--libdir=/usr/lib --libexecdir=/usr/libexec --localstatedir=/var
--sharedstatedir=/usr/com --mandir=/usr/share/man
--infodir=/usr/share/info CFLAGS=-O2 -g -pipe CXXFLAGS=-O2 -g -pipe
FFLAGS=-O2 -g -pipe build_alias=ia64-redhat-linux-gnu
host_alias=ia64-redhat-linux-gnu target_alias=ia64-redhat-linux-gnu
--no-create --no-recursion

It will be nice to use CFLAGS="-O2 -g -pipe" instead of
CFLAGS=-O2 -g -pipe.


H.J.