tlbuild: xindy package
6.5.2 The 'xindy' package in 'utils/xindy'
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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'.