diff -Nur labltk-labltk-8.06.4/support/Makefile labltk.new/support/Makefile
--- labltk-labltk-8.06.4/support/Makefile	2017-10-30 17:17:52.000000000 +0800
+++ labltk.new/support/Makefile	2021-09-09 17:19:14.856798739 +0800
@@ -28,7 +28,7 @@
       cltkFile.$(O) cltkMain.$(O) cltkMisc.$(O) cltkTimer.$(O) \
       cltkVar.$(O) cltkWait.$(O) cltkImg.$(O)
 
-CCFLAGS=-I$(LIBDIR)/caml $(TK_DEFS) $(SHAREDCCCOMPOPTS) -g
+CCFLAGS=-I$(LIBDIR)/caml $(TK_DEFS) $(SHAREDCCCOMPOPTS) -g ${RPM_OPT_FLAGS}
 
 COMPFLAGS=-I +unix
 THFLAGS=-I +threads -I vmthreads