Hmmm. It had to do with tcl/tk on FreeBSD. The configure scripts are

in
different directories.  The patch gave the option of specifying a dir
for
the tk script and if they were both in the same directory then it didn't
mind being empty.  It's small so I'm including it.  It was tested with
autoconf 2.12.

Vince.

src/configure.in

@@ -301,6 +301,21 @@ AC_ARG_WITH(tclconfig,
     ]
 )
 
+dnl We see if the path to the TK configuration scripts is specified.
+dnl This will overide the use of tclsh to find the paths to search.
+
+AC_ARG_WITH(tkconfig,
+    [  --with-tkconfig=DIR     tkConfig.sh is in DIR],
+    [
+	case "$withval" in
+	"" | y | ye | yes | n | no)
+	    AC_MSG_ERROR([*** You must supply an argument to the --with-tkconfig option.])
+	  ;;
+	esac
+	TK_DIRS="$withval"
+    ]
+)
+
 dnl We exclude perl support unless we override it with --with-perl
 AC_MSG_CHECKING(setting USE_PERL)
 AC_ARG_WITH(
@@ -927,7 +942,7 @@ then
 	then
 		library_dirs=`echo 'puts $auto_path' | $TCLSH`
 	fi
-	library_dirs="$TCL_DIRS $library_dirs"
+	library_dirs="$TCL_DIRS $TK_DIRS $library_dirs"
 	for dir in $library_dirs; do
 		if test -d "$dir" -a -r "$dir/tclConfig.sh"; then
 			TCL_CONFIG_SH=$dir/tclConfig.sh