use $(mkdir_p) variable and appropriate macro. This is re quired

for older automake versions

: merge to release

[[Imported from SVN: r5892]]

am/documentation

@@ -51,7 +51,7 @@ doc-clean-documentation:
 
 install-documentation: $(DOCFILES) install-documentation-local
 	@$(NORMAL_INSTALL)
-	test -z "$(docdir)" || $(MKDIR_P) "$(DESTDIR)$(docdir)"
+	test -z "$(docdir)" || $(mkdir_p) "$(DESTDIR)$(docdir)"
 	@list='$(DOCFILES) $(DOCFILES_EXTRA)'; test -n "$(docdir)" || list=; \
 	for p in $$list; do \
 	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \

m4/dune_common.m4

@@ -12,6 +12,8 @@ AC_DEFUN([DUNE_COMMON_CHECKS],
   AC_REQUIRE([AC_PROG_RANLIB])
   AC_REQUIRE([AC_PROG_LIBTOOL])
   AC_REQUIRE([AC_PROG_AWK])
+  # defined $(mkdir_p), which is required during install
+  AC_REQUIRE([AM_PROG_MKDIR_P])
 
   AC_REQUIRE([DUNE_CHECK_COMPILER])
   AC_REQUIRE([GXX0X])