Add options to specify /usr/lib/X11R5 and /usr/include/X11R5.
/* However, HPUX 9 has Motif includes in a strange place.
So search that place. These definitions assume that X11R5 is being
used -- if X11R4 is used, "s/hpux9-x11r4.h" gets loaded instead. */
-#define C_SWITCH_X_SYSTEM -I/usr/include/Motif1.2
-#define LD_SWITCH_X_DEFAULT -L/usr/lib/Motif1.2
+#define C_SWITCH_X_SYSTEM -I/usr/include/X11R5 -I/usr/include/Motif1.2
+#define LD_SWITCH_X_DEFAULT -L/usr/lib/X11R5 -L/usr/lib/Motif1.2
#ifndef HAVE_LIBXMU
/* HP-UX doesn't supply Xmu. */