Set the default PATH to the one set by login, with the addition of the
/usr/X11R6/bin to the end of the list.

--- krb5-1.5/src/clients/ksu/Makefile.in	2006-05-24 17:19:23.000000000 -0400
+++ krb5-1.5/src/clients/ksu/Makefile.in	2006-07-05 14:24:41.000000000 -0400
@@ -2,7 +2,7 @@
 myfulldir=clients/ksu
 mydir=clients/ksu
 BUILDTOP=$(REL)..$(S)..
-DEFINES = -DGET_TGT_VIA_PASSWD -DPRINC_LOOK_AHEAD -DCMD_PATH='"/bin /local/bin"'
+DEFINES = -DGET_TGT_VIA_PASSWD -DPRINC_LOOK_AHEAD -DCMD_PATH='"/usr/local/sbin /usr/local/bin /sbin /usr/sbin /bin /usr/bin /usr/X11R6/bin"'
 DEFS=
 
 PROG_LIBPATH=-L$(TOPLIBD)