oldlibs5: a.out (libc4) libraries from XFree86 2.1.1 (X11R5).
oldlibs5:
oldlibs5: This package adds libX11.so.3.1.0, libXaw.so.3.1.0, and
oldlibs5: libXt.so.3.1.0 to your /usr/i386-slackware-linux-gnuaout/lib
oldlibs5: directory.  
oldlibs5:
oldlibs5: These are a.out format libraries that are mostly obsolete by now, but
oldlibs5: are retained in case you encounter one of the a.out X11R5 X binaries
oldlibs5: that are still floating around.  These have become quite rare.
oldlibs5:
oldlibs5:
oldlibs6: a.out (libc4) libraries from XFree86 3.1.1 (X11R6).
oldlibs6:
oldlibs6: This package adds libPEX5.so.6.0, libX11.so.6.0, libXIE.so.6.0,
oldlibs6: libXaw.so.6.0, libXpm.so.4.3, and libXt.so.6.0 to your
oldlibs6: /usr/i386-slackware-linux-gnuaout/lib directory.
oldlibs6:
oldlibs6: These are a.out format libraries that are mostly obsolete by now, but
oldlibs6: are retained in case you encounter one of the a.out X11R6 X binaries
oldlibs6: that are still floating around.  These have become quite rare.
oldlibs6:
oldlibs6:
aoutlibs: a.out (libc4) shared libraries
aoutlibs:
aoutlibs: These shared libraries provide support for running Linux binaries
aoutlibs: compiled in the now obsolete a.out binary format.  These libraries
aoutlibs: can be found in /usr/i386-slackware-linux-gnuaout/lib.
aoutlibs:
aoutlibs: Adds crt0.o, libvga.so.1.2.9, libdb.so.1.85.1, libc.so.4.7.6,
aoutlibs: libcurses.so.0.1.2, libm.so.4.6.27.
aoutlibs:
aoutlibs:
aoutlibs: