diff -Nur skycat-3.1.3.orig/astrotcl/library/AstrotclInit.tcl skycat-3.1.3/astrotcl/library/AstrotclInit.tcl
--- skycat-3.1.3.orig/astrotcl/library/AstrotclInit.tcl	2017-08-10 16:18:22.100000000 +0000
+++ skycat-3.1.3/astrotcl/library/AstrotclInit.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -11,7 +11,7 @@
 # pbiereic     24/08/99    created
 # abrighto     21/12/05    updated for new version
 
-if {![lcontain $auto_path $astrotcl_library]} {
+if { $auto_path ni $astrotcl_library } {
     lappend auto_path $astrotcl_library
 }
 
diff -Nur skycat-3.1.3.orig/cat/library/AstroCat.tcl skycat-3.1.3/cat/library/AstroCat.tcl
--- skycat-3.1.3.orig/cat/library/AstroCat.tcl	2017-08-10 16:18:22.110000000 +0000
+++ skycat-3.1.3/cat/library/AstroCat.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -145,7 +145,7 @@
 	    return
 	}
 	if {"$onoff" == "on"} {
-	    lassign [pipe] rfd_ wfd_
+	    lassign [chan pipe] rfd_ wfd_
 	    fileevent $rfd_ readable [code $this feedback]
 	    $w_.cat feedback $wfd_
 	} elseif {[info exists rfd_]} {
diff -Nur skycat-3.1.3.orig/cat/library/AstroImage.tcl skycat-3.1.3/cat/library/AstroImage.tcl
--- skycat-3.1.3.orig/cat/library/AstroImage.tcl	2017-08-10 16:18:22.110000000 +0000
+++ skycat-3.1.3/cat/library/AstroImage.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -401,7 +401,7 @@
 	    return
 	}
 	if {"$onoff" == "on"} {
-	    lassign [pipe] rfd_ wfd_
+	    lassign [chan pipe] rfd_ wfd_
 	    fileevent $rfd_ readable [code $this feedback]
 	    $w_.im feedback $wfd_
 	} elseif {[info exists rfd_]} {
diff -Nur skycat-3.1.3.orig/cat/library/CatInit.tcl skycat-3.1.3/cat/library/CatInit.tcl
--- skycat-3.1.3.orig/cat/library/CatInit.tcl	2017-08-10 16:18:22.110000000 +0000
+++ skycat-3.1.3/cat/library/CatInit.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -12,7 +12,7 @@
 
 package require img::xpm
 
-if {![lcontain $auto_path $cat_library]} {
+if { $auto_path ni $cat_library } {
     lappend auto_path $cat_library
 }
 
diff -Nur skycat-3.1.3.orig/rtd/library/RtdImageBias.tcl skycat-3.1.3/rtd/library/RtdImageBias.tcl
--- skycat-3.1.3.orig/rtd/library/RtdImageBias.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/RtdImageBias.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -10,6 +10,12 @@
 
 itk::usual RtdImageBias {}
 
+# see http://wiki.tcl.tk/2028
+proc lvarpush {var val {ndx end}} {
+  upvar $var args
+  set args [linsert $args $ndx $val]
+}
+
 # RtdImageBias is a class for controlling the subtraction of
 # a bias frame.
 
diff -Nur skycat-3.1.3.orig/rtd/library/RtdImageFitsHeader.tcl skycat-3.1.3/rtd/library/RtdImageFitsHeader.tcl
--- skycat-3.1.3.orig/rtd/library/RtdImageFitsHeader.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/RtdImageFitsHeader.tcl	2017-08-10 17:41:35.500000000 +0000
@@ -11,6 +11,8 @@
 # pbiereic    17/02/03   fixed problems with tabnotebook, packing order
 #                        and labels of tabsets
 
+package require Tclutil
+
 itk::usual RtdImageFitsHeader {}
 
 # RtdImageFitsHeader is an itcl widget for displaying the FITS header of all
@@ -156,7 +158,7 @@
 	set tconfig_(sort_cols) $sort_cols
 	set tconfig_(sort_order) $sort_order
 
-	loop i 0 $num_hdus_ {
+	for {set i 0} {$i < $num_hdus_} {incr i} {
             $tabnotebook_(table$i) config -sort_cols $sort_cols \
 		    -sort_order $sort_order
 	    $tabnotebook_(table$i) new_info
@@ -169,7 +171,7 @@
 	global $var
 	set val [set $var]
 	set tconfig_($label) $val
-	loop i 0 $num_hdus_ {
+	for {set i 0} {$i < $num_hdus_} {incr i} {
 	    $tabnotebook_(table$i) set_option $label Show $val
 	    $tabnotebook_(table$i) new_info
 	}
@@ -216,7 +218,7 @@
 
 	set length [string length [$listbox get 0]]
 
-        loop n $start_idx $end_idx {
+        for {set n $start_idx} {$n < $end_idx} {incr n} {
 	    set row [string tolower [$listbox get $n]]
             if {[catch {regexp -indices $string $row indices} idx] } { continue }
 	    if { $idx > 0 } {
@@ -274,7 +276,7 @@
 	set hlist [$image_ hdu list]
 
 	set ExtName "HDU 1"
-	loop i 0 $hdu_count {
+	for {set i 0} {$i < $hdu_count} {incr i} {
 	    set hdu [expr {$i + 1}]
 	    set list [lindex $hlist $i]
 	    
diff -Nur skycat-3.1.3.orig/rtd/library/RtdImageHduChooser.tcl skycat-3.1.3/rtd/library/RtdImageHduChooser.tcl
--- skycat-3.1.3.orig/rtd/library/RtdImageHduChooser.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/RtdImageHduChooser.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -16,6 +16,7 @@
 # pbiereic        11/10/08   Break image display loop after failure.
 # pbiereic        26/11/08   Using 'view update' for HDU images display.
 #                            Using a toplevel window for the HDU images display.
+package require Tclutil
 
 itk::usual RtdImageHduChooser {}
 
@@ -426,7 +427,7 @@
     
     private method svinfo {} {
 	set list [array get ext_ *NAXIS*]
-	loop i 0 [llength $list] 2 {
+	for {set i 0} {$i < [llength $list]} {incr i 2} {
 	    lappend newlist "[lindex $list $i] [lindex $list [expr {$i+1}]]"
 	}
 	set newlist [lsort -increasing -index 0 $newlist]
diff -Nur skycat-3.1.3.orig/rtd/library/RtdImagePerf.tcl skycat-3.1.3/rtd/library/RtdImagePerf.tcl
--- skycat-3.1.3.orig/rtd/library/RtdImagePerf.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/RtdImagePerf.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -9,6 +9,7 @@
 # D. Hopkinson    31 Jan 97  Created
 # P.Biereichel    21/07/97   % display is the default + some bug fixes
 # P.Biereichel    01/03/01   Only % display suported + code revised
+package require Tclutil
 
 itk::usual RtdImagePerf {}
 
diff -Nur skycat-3.1.3.orig/rtd/library/RtdImagePick2.tcl skycat-3.1.3/rtd/library/RtdImagePick2.tcl
--- skycat-3.1.3.orig/rtd/library/RtdImagePick2.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/RtdImagePick2.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -62,6 +62,7 @@
 # NOTES
 # - In contrast to RtdImagePick, RtdImagePick2 does not use tkwait which may
 #   cause problem for an inheriting class due to nested calls to tkwait.
+package require Tclutil
 
 itk::usual RtdImagePick2 { }
 
@@ -127,7 +128,7 @@
 		{Set the magnification factor of the zoom} \
 		-menu [menu $magMenu_]
 
-	loop i 2 31 {
+	for {set i 2} {$i < 31} {incr i} {
 	    $m.mag add radiobutton -label " ${i}x" \
 		    -command [code $this scaleZoom $i] \
 		    -variable $magMenu_
diff -Nur skycat-3.1.3.orig/rtd/library/RtdInit.tcl skycat-3.1.3/rtd/library/RtdInit.tcl
--- skycat-3.1.3.orig/rtd/library/RtdInit.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/RtdInit.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -10,7 +10,7 @@
 # --------     ---------   ----------------------------------------------
 # pbiereic     24/08/99    created
 
-if {![lcontain $auto_path $rtd_library]} {
+if { $auto_path ni $rtd_library} {
     lappend auto_path $rtd_library
 }
 
diff -Nur skycat-3.1.3.orig/rtd/library/Rtd.tcl skycat-3.1.3/rtd/library/Rtd.tcl
--- skycat-3.1.3.orig/rtd/library/Rtd.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/Rtd.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -650,7 +650,7 @@
 	set t6 "Tcl version:\t[info patchlevel]"
 	set t7 "Tcl package path:\t$tcl_pkgPath"
 	set t8 "Package versions:\t"
-	foreach el "Tclx Itcl Itk Tkx BLT" {
+	foreach el "Itcl Itk BLT" {
 	    set t8 "$t8$el[package versions $el] "
 	}
         DialogWidget $w_.rtd_about \
diff -Nur skycat-3.1.3.orig/rtd/library/tRtd.tcl skycat-3.1.3/rtd/library/tRtd.tcl
--- skycat-3.1.3.orig/rtd/library/tRtd.tcl	2017-08-10 16:18:22.120000000 +0000
+++ skycat-3.1.3/rtd/library/tRtd.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -10,6 +10,7 @@
 # who             when       what
 # --------------  ---------  ----------------------------------------
 # pbiereic        01/03/01   Created
+package require Tclutil
 
 itk::usual tRtd {}
 
diff -Nur skycat-3.1.3.orig/rtd/util/rmipc.tcl skycat-3.1.3/rtd/util/rmipc.tcl
--- skycat-3.1.3.orig/rtd/util/rmipc.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/rtd/util/rmipc.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -20,7 +20,7 @@
     }
     set f [open "|ipcs $opt"]
     while {[gets $f line] != -1} {
-        if { ![lcontain $line $env(USER)]} { continue }
+        if { $line ni $env(USER) } { continue }
 	set num [lindex $line 1]
 	if {![catch {expr $num}]} {
 	    if {[catch {exec ipcrm $opt $num} msg]} {
diff -Nur skycat-3.1.3.orig/skycat/library/SkycatInit.tcl skycat-3.1.3/skycat/library/SkycatInit.tcl
--- skycat-3.1.3.orig/skycat/library/SkycatInit.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/skycat/library/SkycatInit.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -12,9 +12,11 @@
 
 package require img::xpm
 
-if {![lcontain $auto_path $skycat_library]} {
+if { $auto_path ni $skycat_library } {
     lappend auto_path $skycat_library
 }
 
 namespace eval skycat {namespace export *}
 namespace import -force skycat::*
+namespace import ::tcl::mathfunc::max
+namespace import ::tcl::mathfunc::min
diff -Nur skycat-3.1.3.orig/tclutil/library/Batch.tcl skycat-3.1.3/tclutil/library/Batch.tcl
--- skycat-3.1.3.orig/tclutil/library/Batch.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/tclutil/library/Batch.tcl	2017-08-10 17:40:54.160000000 +0000
@@ -15,6 +15,8 @@
 # --------   ---------   ----------------------------------------------
 # A.Brighton 20 Dec 95   created
 
+package require Expect
+
 itk::usual Batch {}
 
 # This class is used to evaluate a set of Tcl commands in a separate
@@ -55,7 +57,7 @@
 	}
 	flush stdout
 	flush stderr
-	pipe rfd wfd
+	lassign [chan pipe] rfd wfd
 	set pid [fork]
 	if {$pid == 0} {
 	    # child
@@ -65,7 +67,7 @@
 	    close $fd
 	    puts $wfd $status
 	    close $wfd
-	    kill [pid]
+	    kill [pid] 9
 	} else {
 	    set bg_pid_ $pid
 	    fileevent $rfd readable [code $this read_pipe $rfd $wfd]
diff -Nur skycat-3.1.3.orig/tclutil/library/canvastext.tcl skycat-3.1.3/tclutil/library/canvastext.tcl
--- skycat-3.1.3.orig/tclutil/library/canvastext.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/tclutil/library/canvastext.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -21,7 +21,7 @@
 proc ct_search_forward_char {canvas item char} {
     if {![lempty $item]} {
 	set text [lindex [$canvas itemconfigure $item -text] 4]
-	loop i [$canvas index $item insert] [$canvas index $item end] {
+	for {set i [$canvas index $item insert]} {$i < [$canvas index $item end]} {incr i} {
 	    if {$char == [string index $text $i]} {
 		return $i
 	    }
@@ -37,7 +37,7 @@
 proc ct_search_backward_char {canvas item char} {
     if {![lempty $item]} {
 	set text  [lindex [$canvas itemconfigure $item -text] 4]
-	loop i [expr {[$canvas index $item insert] - 1}] 0 -1 {
+	for {set i [expr {[$canvas index $item insert] - 1}]} {$i > 0} {decr i} {
 	    if {$char == [string index $text $i]} {
 		return $i
 	    }
diff -Nur skycat-3.1.3.orig/tclutil/library/itcldoc.tcl skycat-3.1.3/tclutil/library/itcldoc.tcl
--- skycat-3.1.3.orig/tclutil/library/itcldoc.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/tclutil/library/itcldoc.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -36,7 +36,6 @@
 # A.Brighton 07 Jan 98   created
 
 package require Itcl
-package require Tclx
 
 itcl::class ItclDoc {
 
diff -Nur skycat-3.1.3.orig/tclutil/library/list.tcl skycat-3.1.3/tclutil/library/list.tcl
--- skycat-3.1.3.orig/tclutil/library/list.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/tclutil/library/list.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -50,3 +50,9 @@
     }
     return $l
 }
+
+proc lempty {list} {
+    if {[catch {llength $list} len]} { return 0 }
+    return [expr {$len == 0}]
+}
+
diff -Nur skycat-3.1.3.orig/tclutil/library/TclutilInit.tcl skycat-3.1.3/tclutil/library/TclutilInit.tcl
--- skycat-3.1.3.orig/tclutil/library/TclutilInit.tcl	2017-08-10 16:18:22.130000000 +0000
+++ skycat-3.1.3/tclutil/library/TclutilInit.tcl	2017-08-10 17:38:25.850000000 +0000
@@ -16,9 +16,8 @@
 
 package require Itcl
 package require Itk
-package require Tclx
 
-if {![lcontain $auto_path $tclutil_library]} {
+if {$auto_path ni $tclutil_library} {
     lappend auto_path $tclutil_library
 }