Patch from Ralf Corsepius <corsepiu@faw.uni-ulm.de>:

Moves some configure.in fragments to new macro files below aclocal/
   (Motivation: Prepare splitting the toplevel configure.in script)

aclocal/path-ksh.m4

@@ -0,0 +1,14 @@
+dnl $Id$
+
+AC_DEFUN(RTEMS_PATH_KSH,
+[
+dnl NOTE: prefer bash over ksh over sh
+AC_PATH_PROGS(KSH,bash ksh sh)
+if test -z "$KSH"; then
+dnl NOTE: This cannot happen -- /bin/sh must always exist
+AC_MSG_ERROR(
+[***]
+[    Cannot determine a usable shell bash/ksh/sh]
+[    Please contact your system administrator] );
+fi
+])

aclocal/path-perl.m4

@@ -0,0 +1,12 @@
+dnl $Id$
+
+AC_DEFUN(RTEMS_PATH_PERL,
+[
+AC_PATH_PROG(PERL,perl)
+if test -z "$PERL" ; then
+AC_MSG_WARN(
+[***]
+[   perl was not found]
+[   Note: Some tools will not be built.])
+fi
+])