--- a/configure.ac	2024-02-27 20:44:51.154115391 +0100
+++ b/configure.ac	2024-02-27 20:45:10.488884871 +0100
@@ -263,7 +263,7 @@
 itcl_SRC_DIR=`cd "${itcl_SRC_DIR}"; pwd`
 AC_SUBST(itcl_SRC_DIR)
 
-eval itcl_INCLUDE_SPEC="-I${itcl_SRC_DIR}/generic -I${itcl_SRC_DIR}"
+itcl_INCLUDE_SPEC="-I${itcl_SRC_DIR}/generic -I${itcl_SRC_DIR}"
 AC_SUBST(itcl_INCLUDE_SPEC)
 
 #--------------------------------------------------------------------