Index: README.txt
==================================================================
--- README.txt
+++ README.txt
@@ -60,10 +60,11 @@
 
   --disable-tls1          disable TLS1 protocol
   --disable-tls1_1        disable TLS1.1 protocol
   --disable-tls1_2        disable TLS1.2 protocol
   --disable-tls1_3        disable TLS1.3 protocol
+  --enable-debug          enable debugging mode and output more status
   --enable-ssl-fastpath   enable using the underlying file descriptor for talking directly to the SSL library
   --enable-hardening      enable hardening attempts
   --enable-static-ssl     enable static linking to the SSL library
 
 If either TCL or OpenSSL are installed in non-standard locations, the following

Index: acinclude.m4
==================================================================
--- acinclude.m4
+++ acinclude.m4
@@ -55,10 +55,24 @@
 			AC_MSG_CHECKING([for disable TLS1.3 protocol])
 			AC_MSG_RESULT([yes])
 		fi
 	])
 
+
+	dnl Determine if debugging mode should be enabled
+	AC_ARG_ENABLE([debug], AS_HELP_STRING([--enable-debug],
+		[enable debugging mode and output more status]), [
+		tcltls_debug_mode="$enableval"
+	], [
+		tcltls_debug_mode='no'
+	])
+	if test "$tcltls_debug_mode" == 'yes'; then
+		AC_DEFINE(TCLEXT_TCLTLS_DEBUG, [1], [Enable debugging mode])
+	fi
+	AC_MSG_CHECKING([for debug mode])
+	AC_MSG_RESULT([$tcltls_debug_mode])
+
 
 	dnl Determine if we have been asked to use a fast path if possible
 	AC_ARG_ENABLE([ssl-fastpath], AS_HELP_STRING([--enable-ssl-fastpath],
 		[enable using the underlying file descriptor for talking directly to the SSL library]), [
 		tcltls_ssl_fastpath="$enableval"

Index: configure
==================================================================
--- configure
+++ configure
@@ -771,10 +771,11 @@
 enable_ssl3
 enable_tls1
 enable_tls1_1
 enable_tls1_2
 enable_tls1_3
+enable_debug
 enable_ssl_fastpath
 enable_hardening
 enable_static_ssl
 with_openssl_dir
 with_openssl_includedir
@@ -1422,10 +1423,11 @@
   --disable-ssl3          disable SSL3 protocol
   --disable-tls1          disable TLS1 protocol
   --disable-tls1_1        disable TLS1.1 protocol
   --disable-tls1_2        disable TLS1.2 protocol
   --disable-tls1_3        disable TLS1.3 protocol
+  --enable-debug          enable debugging mode and output more status
   --enable-ssl-fastpath   enable using the underlying file descriptor for
                           talking directly to the SSL library
   --enable-hardening      enable hardening attempts
   --enable-static-ssl     enable static linking to the SSL library
 
@@ -5541,11 +5543,11 @@
 	PKG_LIBS="$PKG_LIBS $i"
     done
 
 
 
-    PKG_CFLAGS="$PKG_CFLAGS "
+    PKG_CFLAGS="$PKG_CFLAGS -U Tcl_Size"
 
 
 
     vars=""
     for i in $vars; do
@@ -9175,11 +9177,11 @@
 # This marco includes the TCL TLS specific functions to set the
 # OpenSSL or LibreSSL config.
 #--------------------------------------------------------------------
 
 
-	if test -n "$ac_tool_prefix"; then
+		if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}pkg-config", so it can be a program name with args.
 set dummy ${ac_tool_prefix}pkg-config; ac_word=$2
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
 printf %s "checking for $ac_word... " >&6; }
 if test ${ac_cv_prog_PKG_CONFIG+y}
@@ -9370,10 +9372,34 @@
 		fi
 
 fi
 
 
+
+		# Check whether --enable-debug was given.
+if test ${enable_debug+y}
+then :
+  enableval=$enable_debug;
+		tcltls_debug_mode="$enableval"
+
+else case e in #(
+  e)
+		tcltls_debug_mode='no'
+	 ;;
+esac
+fi
+
+	if test "$tcltls_debug_mode" == 'yes'; then
+
+printf "%s\n" "#define TCLEXT_TCLTLS_DEBUG 1" >>confdefs.h
+
+	fi
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for debug mode" >&5
+printf %s "checking for debug mode... " >&6; }
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $tcltls_debug_mode" >&5
+printf "%s\n" "$tcltls_debug_mode" >&6; }
+
 
 		# Check whether --enable-ssl-fastpath was given.
 if test ${enable_ssl_fastpath+y}
 then :
   enableval=$enable_ssl_fastpath;