--- a/tclconfig/tcl.m4	2019-12-07 22:00:18.094712146 +0100
+++ b/tclconfig/tcl.m4	2019-12-07 22:00:28.961515544 +0100
@@ -434,7 +434,6 @@
     AC_SUBST(TCL_STUB_LIB_SPEC)
 
     AC_MSG_CHECKING([platform])
-    hold_cc=$CC; CC="$TCL_CC"
     AC_TRY_COMPILE(,[
 	    #ifdef _WIN32
 		#error win32
@@ -446,7 +445,6 @@
 	    TEA_PLATFORM="windows"
 	    AC_CHECK_PROG(CYGPATH, cygpath, cygpath -m, echo)	]
     )
-    CC=$hold_cc
     AC_MSG_RESULT($TEA_PLATFORM)
 
     # The BUILD_$pkg is to define the correct extern storage class
--- a/configure.ac	2019-12-07 22:06:56.954496437 +0100
+++ b/configure.ac	2019-12-07 22:07:53.538472872 +0100
@@ -33,6 +33,7 @@
 TEA_INIT([3.13])
 
 AC_CONFIG_AUX_DIR(tclconfig)
+AC_CONFIG_SUBDIRS([extensions/tnc extensions/example])
 
 #--------------------------------------------------------------------
 # Load the tclConfig.sh file