tlbuild: xindy package

 
 6.5.2 The 'xindy' package in 'utils/xindy'
 ------------------------------------------
 
 This module uses the distributed source tree 'xindy-src/' with
 modifications documented in 'TLpatches/*', and a wrapper 'configure.ac'
 and 'Makefile.am' that descends into 'xindy-src'.
 
    The 'xindy' build requires a 'make' that supports a 'VPATH' build,
 can handle all targets, and do not refer to '${top_srcdir}' or
 '${top_builddir}'.  The fragment 'xindy/ac/withenable.ac' contains
 
      KPSE_ENABLE_PROG([xindy], , [disable])
      m4_include(kpse_TL[utils/xindy/ac/xindy.ac])
      m4_include(kpse_TL[utils/xindy/ac/clisp.ac])
 
 where 'disable' in the third argument indicates that 'xindy' is only
 built if explicitly enabled by the user with 'configure --enable-xindy'
 (the need for 'clisp' makes it too painful to enable by default).
 
    The additional fragments 'ac/xindy.ac' and 'ac/clisp.ac' specify more
 'configure' options to be seen at the top level, with 'ac/xindy.ac' also
 included by 'configure.ac'.