Build gcc-4.9.4 on OSX-ppc with included requirements, but linked otherwise.

[ssbb]

Hello
  As subject say, building is ok, but some points arise, so asking some 
(maybe elementary) question to experts:

Gcc-4.9.4 on PowerMac-G5 OSX-10.5.8, using apple gcc-4.2.1, build fine, 
test and install:
Included in gcc source tree the required libraries: gmp-4.3.2, 
mpfr-2.4.2,  mpc-0.8.1, and  isl-0.12.2, cloog-0.18.1 plus libiconv-1.15.
Configured with:
------------------------
export MAC=powerpc-apple-darwin9.8.0
../gcc-4.9.4/configure  --prefix=/usr/local/gcc-4.9.4 --disable-nls 
--enable-languages=c,c++ --build=$MAC --host=$MAC --target=$MAC
------------------------

With otool i examine the executables and find:
------------------------
$ otool -L /usr/local/gcc-4.9.4/bin/c++
./c++:
	/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 
7.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current 
version 111.1.7)
------------------------
Same is for all others exec in bin/

[QUESTION]: libiconv included in sourcetree was build, but later ignored 
at link time in favor of system libiconv?

Looking more with otools:
------------------------
$ otool -L 
/usr/local/gcc-4.9.4/libexec/gcc/powerpc-apple-darwin9.8.0/4.9.4/cc1
/usr/local/gcc-4.9.4/libexec/gcc/powerpc-apple-darwin9.8.0/4.9.4/cc1:
	/usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 
7.0.0)
	/usr/local/lib/libmpfr.1.dylib (compatibility version 3.0.0, current 
version 3.0.0)
	/usr/local/lib/libgmp.3.dylib (compatibility version 9.0.0, current 
version 9.2.0)
	/usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.3)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current 
version 111.1.7)
------------------------
[Q]: cc1 was linked with libs of another installations (4.4.1) resident 
in usual /usr/local location? and not with included libs?

And searching for new libs  {gmp, mpfr, mpc, isl, cloog, libiconv} i do 
not find any,
[Q]:where are (supposed to be) installed after they are build with gcc? 
i expect to find in /usr/local/gcc-NNN/lib, but apparently gcc-build 
process use the libs obj without install them?
------------------------
$  ls /usr/local/gcc-4.9.4/lib
gcc			libgcc_s_x86_64.1.dylib	libitm.la		libstdc++.a
libatomic.1.dylib	libgomp.1.dylib		libitm.spec		libstdc++.a-gdb.py
libatomic.a		libgomp.a		libssp.0.dylib		libstdc++.dylib
libatomic.dylib		libgomp.dylib		libssp.a		libstdc++.la
libatomic.la		libgomp.la		libssp.dylib		libsupc++.a
libgcc_ext.10.4.dylib	libgomp.spec		libssp.la		libsupc++.la
libgcc_ext.10.5.dylib	libitm.1.dylib		libssp_nonshared.a	ppc64
libgcc_s.1.dylib	libitm.a		libssp_nonshared.la
libgcc_s_ppc64.1.dylib	libitm.dylib		libstdc++.6.dylib
$ ls /usr/local/gcc-4.9.4/lib/ppc64/
libatomic.1.dylib	libgomp.la		libssp.0.dylib		libstdc++.a
libatomic.a		libgomp.spec		libssp.a		libstdc++.a-gdb.py
libatomic.dylib		libitm.1.dylib		libssp.dylib		libstdc++.dylib
libatomic.la		libitm.a		libssp.la		libstdc++.la
libgomp.1.dylib		libitm.dylib		libssp_nonshared.a	libsupc++.a
libgomp.a		libitm.la		libssp_nonshared.la	libsupc++.la
libgomp.dylib		libitm.spec		libstdc++.6.dylib
------------------------
[Q]: Seems that building will use available libs if found, even if are 
newest in source-tree?

[big(ger)-Q]: Otherwise stated, how to build gcc (not static) with all 
libs i included, in the single gcc own directory? so the whole can be 
moved without breaking dependencies, and installed witout overwriting an 
older installation?


Thanks for the attention, and in advance for any idea.
Greetings
----------
Stefano.B