-[if mkdir -p --version . >/dev/null 2>&1 && test ! -d ./--version; then
- # We used to keeping the `.' as first argument, in order to
- # allow $(mkdir_p) to be used without argument. As in
- # $(mkdir_p) $(somedir)
- # where $(somedir) is conditionally defined. However this is wrong
- # for two reasons:
- # 1. if the package is installed by a user who cannot write `.'
- # make install will fail,
- # 2. the above comment should most certainly read
- # $(mkdir_p) $(DESTDIR)$(somedir)
- # so it does not work when $(somedir) is undefined and
- # $(DESTDIR) is not.
- # To support the latter case, we have to write
- # test -z "$(somedir)" || $(mkdir_p) $(DESTDIR)$(somedir),
- # so the `.' trick is pointless.
- mkdir_p='mkdir -p --'
-else
- # On NextStep and OpenStep, the `mkdir' command does not
- # recognize any option. It will interpret all options as
- # directories to create, and then abort because `.' already
- # exists.
- for d in ./-p ./--version;
- do
- test -d $d && rmdir $d
- done
- # $(mkinstalldirs) is defined by Automake if mkinstalldirs exists.
- if test -f "$ac_aux_dir/mkinstalldirs"; then
- mkdir_p='$(mkinstalldirs)'
- else
- mkdir_p='$(install_sh) -d'
- fi
-fi
-AC_SUBST([mkdir_p])])
+[AC_PREREQ([2.60])dnl
+AC_REQUIRE([AC_PROG_MKDIR_P])dnl
+dnl Automake 1.8 to 1.9.6 used to define mkdir_p. We now use MKDIR_P,
+dnl while keeping a definition of mkdir_p for backward compatibility.
+dnl @MKDIR_P@ is magic: AC_OUTPUT adjusts its value for each Makefile.
+dnl However we cannot define mkdir_p as $(MKDIR_P) for the sake of
+dnl Makefile.ins that do not define MKDIR_P, so we do our own
+dnl adjustment using top_builddir (which is defined more often than
+dnl MKDIR_P).
+AC_SUBST([mkdir_p], ["$MKDIR_P"])dnl
+case $mkdir_p in
+ [[\\/$]]* | ?:[[\\/]]*) ;;
+ */*) mkdir_p="\$(top_builddir)/$mkdir_p" ;;
+esac
+])