leolein@leolein-desktop:~/gimp_CVS/gimp$ sh ./autogen.sh --prefix=opt/gimp-2.3-cvs

I am testing that you have the tools required to build the
GNU Image Manipulation Program from CVS. This test is not foolproof,
so if anything goes wrong, see the file HACKING for more information...

checking for libtool >= 1.4 ... yes (version 1.5.22)
checking for gtkdocize ... yes
checking for autoconf >= 2.54 ... yes (version 2.59)
checking for automake >= 1.8.3 ... yes (version 1.9.6)
checking for glib-gettextize ... yes (version 2.10.3)
checking for intltool >= 0.31 ... yes (version 0.35.0)
checking for xsltproc ... yes

I am going to run ./configure with the following arguments:

  --enable-maintainer-mode  --prefix=opt/gimp-2.3-cvs

/usr/share/aclocal/tcl.m4:20: warning: underquoted definition of SC_PATH_TCLCONFIG
  run info '(automake)Extending aclocal'
  or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
/usr/share/aclocal/tcl.m4:124: warning: underquoted definition of SC_PATH_TKCONFIG
/usr/share/aclocal/tcl.m4:228: warning: underquoted definition of SC_LOAD_TCLCONFIG
/usr/share/aclocal/tcl.m4:295: warning: underquoted definition of SC_LOAD_TKCONFIG
/usr/share/aclocal/tcl.m4:332: warning: underquoted definition of SC_PROG_TCLSH
/usr/share/aclocal/tcl.m4:378: warning: underquoted definition of SC_BUILD_TCLSH
/usr/share/aclocal/tcl.m4:406: warning: underquoted definition of SC_ENABLE_SHARED
/usr/share/aclocal/tcl.m4:446: warning: underquoted definition of SC_ENABLE_FRAMEWORK
/usr/share/aclocal/tcl.m4:501: warning: underquoted definition of SC_ENABLE_THREADS
/usr/share/aclocal/tcl.m4:600: warning: underquoted definition of SC_ENABLE_SYMBOLS
/usr/share/aclocal/tcl.m4:657: warning: underquoted definition of SC_ENABLE_LANGINFO
/usr/share/aclocal/tcl.m4:708: warning: underquoted definition of SC_CONFIG_MANPAGES
/usr/share/aclocal/tcl.m4:840: warning: underquoted definition of SC_CONFIG_CFLAGS
/usr/share/aclocal/tcl.m4:2035: warning: underquoted definition of SC_SERIAL_PORT
/usr/share/aclocal/tcl.m4:2164: warning: underquoted definition of SC_MISSING_POSIX_HEADERS
/usr/share/aclocal/tcl.m4:2244: warning: underquoted definition of SC_PATH_X
/usr/share/aclocal/tcl.m4:2330: warning: underquoted definition of SC_BLOCKING_STYLE
/usr/share/aclocal/tcl.m4:2395: warning: underquoted definition of SC_TIME_HANDLER
/usr/share/aclocal/tcl.m4:2472: warning: underquoted definition of SC_BUGGY_STRTOD
/usr/share/aclocal/tcl.m4:2534: warning: underquoted definition of SC_TCL_LINK_LIBS
/usr/share/aclocal/tcl.m4:2611: warning: underquoted definition of SC_TCL_EARLY_FLAG
/usr/share/aclocal/tcl.m4:2623: warning: underquoted definition of SC_TCL_EARLY_FLAGS
/usr/share/aclocal/tcl.m4:2657: warning: underquoted definition of SC_TCL_64BIT_FLAGS
configure.in: installing `./install-sh'
configure.in: installing `./missing'
app/Makefile.am: installing `./compile'
app/Makefile.am: installing `./depcomp'
plug-ins/pygimp/Makefile.am:135: installing `./py-compile'
Symlinking file mkinstalldirs
Symlinking file po/Makefile.in.in

Please add the files
  codeset.m4 gettext.m4 glibc21.m4 iconv.m4 isc-posix.m4 lcmessage.m4
  progtest.m4
from the /usr/share/aclocal directory to your autoconf macro directory
or directly to your aclocal.m4 file.
You will also need config.guess and config.sub, which you can get from
ftp://ftp.gnu.org/pub/gnu/config/.

configure: error: expected an absolute directory name for --prefix: opt/gimp-2.3-cvs

Configure failed or did not finish!