Revise Tcl/Tk configuration. Make missing Tcl after --with-tcl an error,

add --without-tk option to disable Tk.  We don't need the AC_PATH_XTRA
test because tkConfig.sh already contains all the information about how to
compile and link with X.  Also make sure that libpq is up to date for
libpgtcl.  Remove executable bits from pgaccess.sh, but add it to pgaccess.

Author: petere

aclocal.m4

@@ -1,8 +1,9 @@
-dnl $Header: /cvsroot/pgsql/aclocal.m4,v 1.8 2000/09/21 20:17:41 petere Exp $
+dnl $Header: /cvsroot/pgsql/aclocal.m4,v 1.9 2000/09/25 22:22:52 petere Exp $
 builtin([include], [config/ac_func_accept_argtypes.m4])
 builtin([include], [config/c-compiler.m4])
 builtin([include], [config/c-library.m4])
 builtin([include], [config/cxx.m4])
 builtin([include], [config/general.m4])
 builtin([include], [config/programs.m4])
 builtin([include], [config/python.m4])
+builtin([include], [config/tcl.m4])

config/tcl.m4

@@ -0,0 +1,76 @@
+# $Header: /cvsroot/pgsql/config/tcl.m4,v 1.1 2000/09/25 22:22:53 petere Exp $
+
+# Autoconf macros to check for Tcl related things
+
+
+AC_DEFUN([PGAC_PATH_TCLSH],
+         [AC_PATH_PROGS(TCLSH, [tclsh tcl])])
+
+
+# PGAC_PATH_TCLCONFIGSH([SEARCH-PATH])
+# ------------------------------------
+AC_DEFUN([PGAC_PATH_TCLCONFIGSH],
+[AC_REQUIRE([PGAC_PATH_TCLSH])[]dnl
+AC_BEFORE([$0], [PGAC_PATH_TKCONFIGSH])[]dnl
+AC_MSG_CHECKING([for tclConfig.sh])
+# Let user override test
+if test -z "$TCL_CONFIG_SH"; then
+    pgac_test_dirs="$1"
+
+    set X $pgac_test_dirs; shift
+    if test $[#] -eq 0; then
+        test -z "$TCLSH" && AC_MSG_ERROR([unable to locate tclConfig.sh because no Tcl shell was found])
+        set X `echo 'puts $auto_path' | $TCLSH`; shift
+    fi
+
+    for pgac_dir; do
+        if test -r "$pgac_dir/tclConfig.sh"; then
+            TCL_CONFIG_SH=$pgac_dir/tclConfig.sh
+            break
+        fi
+    done
+fi
+
+if test -z "$TCL_CONFIG_SH"; then
+    AC_MSG_RESULT(no)
+    AC_MSG_ERROR([file \`tclConfig.sh' is required for Tcl])
+else
+    AC_MSG_RESULT([$TCL_CONFIG_SH])
+fi
+
+AC_SUBST([TCL_CONFIG_SH])
+])# PGAC_PATH_TCLCONFIGSH
+
+
+# PGAC_PATH_TKCONFIGSH([SEARCH-PATH])
+# ------------------------------------
+AC_DEFUN([PGAC_PATH_TKCONFIGSH],
+[AC_REQUIRE([PGAC_PATH_TCLSH])[]dnl
+AC_MSG_CHECKING([for tkConfig.sh])
+# Let user override test
+if test -z "$TK_CONFIG_SH"; then
+    pgac_test_dirs="$1"
+
+    set X $pgac_test_dirs; shift
+    if test $[#] -eq 0; then
+        test -z "$TCLSH" && AC_MSG_ERROR([unable to locate tkConfig.sh because no Tcl shell was found])
+        set X `echo 'puts $auto_path' | $TCLSH`; shift
+    fi
+
+    for pgac_dir; do
+        if test -r "$pgac_dir/tkConfig.sh"; then
+            TK_CONFIG_SH=$pgac_dir/tkConfig.sh
+            break
+        fi
+    done
+fi
+
+if test -z "$TK_CONFIG_SH"; then
+    AC_MSG_RESULT(no)
+    AC_MSG_ERROR([file \`tkConfig.sh' is required for Tk])
+else
+    AC_MSG_RESULT([$TK_CONFIG_SH])
+fi
+
+AC_SUBST([TK_CONFIG_SH])
+])# PGAC_PATH_TKCONFIGSH