diff -ur labltk-8.06.11.old/support/Makefile labltk-8.06.11/support/Makefile
--- labltk-8.06.11.old/support/Makefile	2021-10-04 19:10:57.000196523 +0100
+++ labltk-8.06.11/support/Makefile	2021-10-04 19:18:06.263137991 +0100
@@ -28,7 +28,7 @@
       cltkFile.$(O) cltkMain.$(O) cltkMisc.$(O) cltkTimer.$(O) \
       cltkVar.$(O) cltkWait.$(O) cltkImg.$(O)
 
-CCFLAGS=-I$(LIBDIR)/caml $(TK_DEFS) $(SHAREDCCCOMPOPTS)
+CCFLAGS=-I$(LIBDIR)/caml $(TK_DEFS) $(SHAREDCCCOMPOPTS) -g
 
 COMPFLAGS=
 THFLAGS=-I +threads -I vmthreads
diff -ur labltk-8.06.11.old/support/Makefile.common labltk-8.06.11/support/Makefile.common
--- labltk-8.06.11.old/support/Makefile.common	2021-10-04 19:10:56.990196618 +0100
+++ labltk-8.06.11/support/Makefile.common	2021-10-04 19:18:06.264137981 +0100
@@ -21,17 +21,17 @@
 ## Tools from the OCaml distribution
 
 CAMLRUN=$(BINDIR)/ocamlrun
-CAMLC=$(BINDIR)/ocamlc$(OPT)
-CAMLOPT=$(BINDIR)/ocamlopt$(OPT) $(WARNERR)
-CAMLCB=$(BINDIR)/ocamlc
-CAMLOPTB=$(BINDIR)/ocamlopt
-CAMLCOMP=$(CAMLC) -c $(WARNERR)
+CAMLC=$(BINDIR)/ocamlc$(OPT) -g
+CAMLOPT=$(BINDIR)/ocamlopt$(OPT) $(WARNERR) -g
+CAMLCB=$(BINDIR)/ocamlc -g
+CAMLOPTB=$(BINDIR)/ocamlopt -g
+CAMLCOMP=$(CAMLC) -c $(WARNERR) -g
 CAMLYACC=$(BINDIR)/ocamlyacc -v
 CAMLLEX=$(BINDIR)/ocamllex
-CAMLLIBR=$(CAMLC) -a
+CAMLLIBR=$(CAMLC) -a -g
 CAMLDEP=$(BINDIR)/ocamldep
 COMPFLAGS=-g
 LINKFLAGS=
-CAMLOPTLIBR=$(CAMLOPT) -a
-MKLIB=$(BINDIR)/ocamlmklib
+CAMLOPTLIBR=$(CAMLOPT) -a -g
+MKLIB=$(BINDIR)/ocamlmklib -g
 CAMLRUNGEN=$(BINDIR)/ocamlrun