2 files changed, 2 insertions, 0 deletions

diff --git a/configure b/configure
index 0520827..f26d09a 100755
--- a/configure
+++ b/configure
@@ -2180,6 +2180,7 @@ cat > conftest.$ac_ext <<EOF
 #include "confdefs.h"
 
 #define WITH_THREAD
+#include <tcl.h>
 #include <_tkinter.h>
 #ifdef TCL_THREADS
 yes
diff --git a/configure.in b/configure.in
index 9e44096..2f771c8 100644
--- a/configure.in
+++ b/configure.in
@@ -107,6 +107,7 @@ AC_MSG_CHECKING("TCL_THREADS")
 AC_EGREP_CPP(yes,
      [
 #define WITH_THREAD
+#include <tcl.h>
 #include <_tkinter.h>
 #ifdef TCL_THREADS
 yes