automake-1.16: Obsolete Macros

 
 6.4.2 Obsolete Macros
 ---------------------
 
 Although using some of the following macros was required in past
 releases, you should not use any of them in new code.  _All these macros
 will be removed in the next major Automake version_; if you are still
 using them, running ‘autoupdate’ should adjust your ‘configure.ac’
 automatically (⇒(automake-1.16))).  _Do it NOW!_
 
 ‘AM_PROG_MKDIR_P’
 
      From Automake 1.8 to 1.9.6 this macro used to define the output
      variable ‘mkdir_p’ to one of ‘mkdir -p’, ‘install-sh -d’, or
      ‘mkinstalldirs’.
 
      Nowadays Autoconf provides a similar functionality with
      ‘AC_PROG_MKDIR_P’ (⇒Particular Program Checks
      (autoconf)Particular Programs.), however this defines the output
      variable ‘MKDIR_P’ instead.  In case you are still using the
      ‘AM_PROG_MKDIR_P’ macro in your ‘configure.ac’, or its provided
      variable ‘$(mkdir_p)’ in your ‘Makefile.am’, you are advised to
      switch ASAP to the more modern Autoconf-provided interface instead;
      both the macro and the variable might be removed in a future major
      Automake release.