POSTIN

/bin/sh

grep -q "^/usr/X11R6/lib$" /etc/ld.so.conf || echo "/usr/X11R6/lib" >> /etc/ld.so.conf
/sbin/ldconfig

POSTUN

/bin/sh

if [ "$1" = "0" ]; then
    rm -f /etc/ld.so.conf.new
    grep -v "^/usr/X11R6/lib$" /etc/ld.so.conf > /etc/ld.so.conf.new
    mv -f /etc/ld.so.conf.new /etc/ld.so.conf
fi
/sbin/ldconfig

Triggers

XFree86-libs

/bin/sh

grep -q "^/usr/X11R6/lib$" /etc/ld.so.conf || echo "/usr/X11R6/lib" >> /etc/ld.so.conf
/sbin/ldconfig

libxfree86

/bin/sh

grep -q "^/usr/X11R6/lib$" /etc/ld.so.conf || echo "/usr/X11R6/lib" >> /etc/ld.so.conf
/sbin/ldconfig