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configure: make makeinfo_html check more robust

The current check is too strict for newer makeinfo versions.
Existing version strings are:
makeinfo (GNU texinfo) 4.13
makeinfo (GNU texinfo) 5.2
texi2any (GNU texinfo) 5.9.93

Probably version 6 will come in the not too far future.

Reviewed-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit 72654526e4489c0aac05d25cfeca5bbba26026b3)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

Andreas Cadhalpun authored on 2015/06/14 03:24:27
Showing 1 changed files
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@@ -5239,8 +5239,8 @@ disabled securetransport || { check_func SecIdentityCreate "-Wl,-framework,CoreF
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     enable securetransport; }
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 makeinfo --version > /dev/null 2>&1 && enable makeinfo  || disable makeinfo
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-enabled makeinfo && (makeinfo --version | \
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-                     grep -q 'makeinfo (GNU texinfo) 5' > /dev/null 2>&1) \
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+enabled makeinfo \
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+    && [ 0$(makeinfo --version | grep "texinfo" | sed 's/.*texinfo[^0-9]*\([0-9]*\)\..*/\1/') -ge 5 ] \
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     && enable makeinfo_html || disable makeinfo_html
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 disabled makeinfo_html && texi2html --help 2> /dev/null | grep -q 'init-file' && enable texi2html || disable texi2html
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 perl -v            > /dev/null 2>&1 && enable perl      || disable perl