Installing gcc-4.2.3 in Fedora core 8, separately from gcc-4.1

[Ken McFarlane]

I have been trying to install gcc-4.2.3 separately from gcc-4.1.  I am
working on a project that needs to run gfortran on a Linux cluster
(likely using Fedora core 8) at a small university.  fc8 comes with
gcc-4.1 and the support for gfortran is a bit better in 4.2.3 (I
think!).

I downloaded the gcc-4.2.3 distribution and unpacked it in
/root/gcc42, creating a directory /root/gcc42/gcc-4.2.3.
(Note: I have installed gmp-4.2.2 and mpfr-2.3.1.)

I created a 'build' directory in gcc-4.2.3 and a script 'buildc' in
the /root/gcc42/gcc-4.2.3/build subdirectory.  The script is below
(with prefix=/opt/gcc42 -- I planned to put the gcc-4.2 files in
/opt/gcc42).  The options were my best guess at the needed options.

#!/bin/sh
/root/gcc42/gcc-4.2.3/configure \
  --prefix=/opt/gcc42 \
  --program-suffix=42 \
  --with-local-prefix=/opt/gcc42 \
  --enable-shared --enable-threads=posix --enable-checking=release \
  --enable-version-specific-runtime-libs \
  --enable-__cxa_atexit --disable-libunwind-exceptions \
  --enable-languages=c,c++,fortran \
  --with-dwarf2 \
  --with-system-zlib \
  --enable-java-awt=gtk,xlib \
  --disable-dssi --enable-plugin \
  --with-gmp=/opt/gmp \
  --with-mpfr=/opt/mpfr \

In 'build', I then invoked buildc:
...build]# ./buildc
This create a Makefile that included the following lines:
.
.
bindir = ${exec_prefix}/bin
sbindir = ${exec_prefix}/sbin
libexecdir = ${exec_prefix}/libexec
datadir = ${prefix}/share
sysconfdir = ${prefix}/etc
sharedstatedir = ${prefix}/com
localstatedir = ${prefix}/var
libdir = ${exec_prefix}/lib
includedir = ${prefix}/include
oldincludedir = /usr/include
infodir = ${prefix}/info
datarootdir = ${prefix}/share
docdir = ${datarootdir}/doc
htmldir = ${docdir}
.
.
# -------------------------------------------------
# Miscellaneous non-standard autoconf-set variables
# -------------------------------------------------

# The gcc driver likes to know the arguments it was configured with.
TOPLEVEL_CONFIGURE_ARGUMENTS=/root/gcc42/gcc-4.2.3/configure
--prefix=/opt/gcc42 --program-suffix=42 --with-local-prefix=/opt/gcc42
--enable-shared --enable-threads=posix --enable-checking=release
--enable-version-specific-runtime-libs --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-languages=c,c++,fortran
--with-dwarf2 --with-system-zlib --enable-java-awt=gtk,xlib
--disable-dssi --enable-plugin --with-gmp=/opt/gmp
--with-mpfr=/opt/mpfr

tooldir = ${exec_prefix}/x86_64-unknown-linux-gnu
build_tooldir = ${exec_prefix}/x86_64-unknown-linux-gnu
.
.
...build]# make
.
...build]# make check
make[1]: Entering directory `/root/gcc42/build'
make[2]: Entering directory `/root/gcc42/build/fixincludes'
autogen -T /root/gcc42/gcc-4.2.3/fixincludes/check.tpl
/root/gcc42/gcc-4.2.3/fixincludes/inclhack.def
make[2]: autogen: Command not found
make[2]: *** [check] Error 127
make[2]: Leaving directory `/root/gcc42/build/fixincludes'
make[1]: *** [check-fixincludes] Error 2
make[1]: Leaving directory `/root/gcc42/build'
make: *** [do-check] Error 2

I tried
...build]# make install

After these commands, there were some executables in /opt/gcc42/bin,
but no include files in /opt/gcc42/include.  Under /opt/gcc42/lib
there was libiberty.a  and a subdir gcc.  This  subdirectory contained
another subdirectory
x86_64-unknown-linux-gnu.

Can someone advise me on what I have missed?  It would be much appreciated.
Regards,
Ken McFarlane