Stefan Fiedler via Rene Rebe:

package/kde/kdebase/kdebase.conf

@@ -22,6 +22,9 @@
 
 . $base/package/*/*/kde-32.conf
 
+pkginstalled samba && var_append confopt " " \
+                      "--with-extra-includes=$root/$pkg_samba_prefix/include"
+
 kde_base_pi()
 {
 	register_xdm kdm 'KDE v3.2 display manager' $bindir/kdm