Installing multiple versions of GCC

[Angelo Graziosi <angelo dot graziosi at alice dot it>]

To have multiple versions of GCC installed, I usually build, on Cygwin, 
configuring as:

prefix_dir_name="usr/local/gfortran"
prefix_dir="/${prefix_dir_name}"
dataroot_dir="${prefix_dir}/share"

eprefix_dir="${prefix_dir}"
sysconf_dir="${prefix_dir}/etc"
lib_dir="${eprefix_dir}/lib"
libexec_dir="${eprefix_dir}/lib"
man_dir="${dataroot_dir}/man"
info_dir="${dataroot_dir}/info"

${source_dir}/configure --prefix="${prefix_dir}" \
	--exec-prefix="${eprefix_dir}" \
	--sysconfdir="${sysconf_dir}" \
	--libdir="${lib_dir}" \
	--libexecdir="${libexec_dir}" \
	--mandir="${man_dir}" \
	--infodir="${info_dir}" \
	--program-suffix="${suffix}" \
	--enable-bootstrap \
	--enable-checking=release \
	--enable-decimal-float=bid \
	--enable-languages=c,c++,fortran \
	--enable-libgomp \
	--enable-libssp \
	--enable-nls \
	--enable-threads=posix \
	--enable-version-specific-runtime-libs \
	--disable-fixed-point \
	--disable-libmudflap \
	--disable-shared \
	--disable-sjlj-exceptions \
	--disable-win32-registry \
	--with-arch=i686 \
	--with-dwarf2 \
	--with-system-zlib \
	--with-tune=generic \
	--without-included-gettext \
	--without-x

in which 'prefix' is /usr/local/gfortran and 'suffix' could be -4.3, 
-4.4 or -4.5.

In any case, doing in this way, I have noticed that 'libiberty.a' is 
installed in '/usr/local/gfortran/lib/',

$ ls -lrt /usr/local/gfortran/lib/
totale 204
-rwxr-x---+ 1 root Users 207326 Jul 23 11:54 libiberty.a
drwxrwx---+ 3 root Users      0 Jul 23 12:05 gcc

with

$ ls -lrt /usr/local/gfortran/lib/gcc/
totale 0
drwxrwx---+ 3 root Users 0 Jul 24 12:30 i686-pc-cygwin

$ ls -lrt /usr/local/gfortran/lib/gcc/i686-pc-cygwin/
totale 0
drwxrwx---+ 6 root Users 0 Jul 23 12:05 4.4.1


This mean it belongs to the last GCC installed (which overwrite the 
previous)

Is there a way to send libiberty.a where go the other libs (i.e 
/usr/local/gfortran/lib/gcc/i686-pc-cygwin/4.4.1/, for example)?

(I suspect there is some configuring option or someone of mine is wrong)


Thanks,
   Angelo.