From 30f5e6535f21ca671d76159b49cc87add1f0b53e Mon Sep 17 00:00:00 2001
From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Thu, 5 May 2022 17:17:11 -0700
Subject: [PATCH] only append 'generic' TCL include path to 'TCL_INCLUDES' if
 it exists

Squashes numerous -Wmissing-include-dirs compilation warnings.
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 450b03577..64002620a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1384,6 +1384,9 @@ if test "x$use_tcl" = "x"; then
 
   if test -f ${TCLSH_EXEC_PREFIX}/include/tcl${TCL_VERSION_FOUND}/tcl.h; then
     TCL_INCLUDES="-I${TCLSH_EXEC_PREFIX}/include/tcl${TCL_VERSION_FOUND} -I${TCLSH_EXEC_PREFIX}/include/tcl${TCL_VERSION_FOUND}/generic"
+    if test -d ${TCLSH_EXEC_PREFIX}/include/tcl${TCL_VERSION_FOUND}/generic; then
+      TCL_INCLUDES="${TCL_INCLUDES} -I${TCLSH_EXEC_PREFIX}/include/tcl${TCL_VERSION_FOUND}/generic"
+    fi
   else
     if test "x${TCLSH_EXEC_PREFIX}" != "x/usr" -a -f ${TCLSH_EXEC_PREFIX}/include/tcl.h; then
       TCL_INCLUDES=-I${TCLSH_EXEC_PREFIX}/include
-- 
2.40.0