--- a/tclconfig/tcl.m4	2023-01-18 20:03:02.719671952 +0100
+++ b/tclconfig/tcl.m4	2023-01-18 20:07:22.110504323 +0100
@@ -981,9 +981,7 @@
     ECHO_VERSION='`echo ${PACKAGE_VERSION}`'
     TCL_LIB_VERSIONS_OK=ok
     CFLAGS_DEBUG=-g
-    CFLAGS_OPTIMIZE=-O
     if test "$GCC" = "yes" ; then
-	CFLAGS_OPTIMIZE=-O2
 	CFLAGS_WARNING="-Wall -Wno-implicit-int"
     else
 	CFLAGS_WARNING=""
@@ -1445,7 +1443,6 @@
 	    SHLIB_LD_LIBS='${LIBS}'
 	    SHLIB_SUFFIX=".so"
 
-	    CFLAGS_OPTIMIZE="-O2 -fomit-frame-pointer"
 	    # egcs-2.91.66 on Redhat Linux 6.0 generates lots of warnings 
 	    # when you inline the string and math operations.  Turn this off to
 	    # get rid of the warnings.
@@ -3158,17 +3155,6 @@
     # It makes compiling go faster.  (This is only a performance feature.)
     #------------------------------------------------------------------------
 
-    if test -z "$no_pipe" -a -n "$GCC"; then
-	AC_CACHE_CHECK([if the compiler understands -pipe],
-	    tcl_cv_cc_pipe, [
-	    hold_cflags=$CFLAGS; CFLAGS="$CFLAGS -pipe"
-	    AC_TRY_COMPILE(,, tcl_cv_cc_pipe=yes, tcl_cv_cc_pipe=no)
-	    CFLAGS=$hold_cflags])
-	if test $tcl_cv_cc_pipe = yes; then
-	    CFLAGS="$CFLAGS -pipe"
-	fi
-    fi
-
     #--------------------------------------------------------------------
     # Common compiler flag setup
     #--------------------------------------------------------------------