Please, take a look at the installation procedure appended to this e-mail. It is standard for Tcl/Tk I launched on my x86_64 laptop. It failed with an incompatibility error. It looks like it cannot find the adequate 64-bit library for X11 and rejects the X11 which is standard for 32-bit. How can I get around this problem ? I need probably to force compilation for 32-bit because th Tcl/Tk will be used for creating a GUI from the Monte Carlo code which is 32-bit. By the way, I got the CERNLIB installed on my laptop... at least the installation procedure completed error-free. Thank you for all your help, Maura cc -pipe -rdynamic tkAppInit.o \ -L/home/mokhov/restricted/mars15/TCLTK/tmpdir/tk8.3.2/unix -ltk8.3 \ -L/home/mokhov/restricted/mars15/TCLTK/tmpdir/tcl8.3.2/unix -ltcl8.3 -L/usr/X11R6/lib -lX11 -ldl -lieee -lm -lc -Wl,-rpath,/home/mokhov/restricted/mars15/linux/lib:/usr/X11R6/lib -o wish /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /usr/X11R6/lib/libX11.so when searching for -lX11 /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: skipping incompatible /usr/X11R6/lib/libX11.a when searching for -lX11 /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.5/../../../../x86_64-suse-linux/bin/ld: cannot find -lX11 collect2: ld returned 1 exit status make: *** [wish] Error 1 ************************************************************************ * installation procedure begins here * ************************************************************************ #!/bin/sh set -e RM=/bin/rm SED=/bin/sed MV=/bin/mv MAKE=make TCLVER=8.3.2 TKVER=8.3.2 #CCOPT="-V -verbose=all -g" CCOPT="-O" # -V -verbose=all" STARTDIR=`pwd` OSTYPE=`uname -s` TMPDIR=tmpdir INSTALLDIR=/home/mokhov/restricted/mars15 #INSTALLDIR=/afs/fnal.gov/files/home/room1/mokhov/restricted/mars15 echo $OSTYPE if [ $OSTYPE = SunOS ]; then XINC=/usr/openwin/include XLIB=/usr/openwin/lib INSTALLDIR=$INSTALLDIR/sun elif [ $OSTYPE = IRIX64 ]; then XINC=/usr/include XLIB=/usr/lib INSTALLDIR=$INSTALLDIR/irix elif [ $OSTYPE = AIX ]; then XINC=/usr/include XLIB=/usr/lib INSTALLDIR=$INSTALLDIR/aix elif [ $OSTYPE = OSF1 ]; then XINC=/usr/include XLIB=/usr/lib INSTALLDIR=$INSTALLDIR/dec elif [ $OSTYPE = Linux ]; then XINC=/usr/include XLIB=/usr/X11R6/lib INSTALLDIR=$INSTALLDIR/linux else echo "System is unknown !" exit 1 fi echo $INSTALLDIR if [ -d $TMPDIR ]; then $RM -rf $TMPDIR fi mkdir $TMPDIR cd $TMPDIR gunzip -dc ../tcl$TCLVER.tar.gz | tar xvvf - cd $STARTDIR pwd cd $TMPDIR/tcl$TCLVER/unix ./configure --disable-shared --prefix=$INSTALLDIR --with-x --x-includes=$XINC --x-libraries=$XLIB $SED s/-O/"$CCOPT"/ Makefile > Makefile.edited $MV -f Makefile.edited Makefile $MAKE $MAKE install cd $STARTDIR cd $TMPDIR gunzip -dc ../tk$TKVER.tar.gz | tar xvvf - cd $STARTDIR cd $TMPDIR/tk$TKVER/unix ./configure --disable-shared --prefix=$INSTALLDIR --with-x --x-includes=$XINC --x-libraries=$XLIB $SED s/-O/"$CCOPT"/ Makefile > Makefile.edited $MV -f Makefile.edited Makefile $MAKE $MAKE install cd $STARTDIR $RM -rf $TMPDIR exit 0 ************************************************************************ * installation procedure ends here * ************************************************************************