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Add explicit check for EGREP in configure.ac
It is used in lib/Makefile.am and we were relying some autoconf macros
to define it as a side-effect. This is not the case anymore as of
autoconf 2.72.
(cherry picked from commit 31cde72476
)
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@ -124,6 +124,9 @@ AC_SUBST([HAVE_WCHAR_T])
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# Needed for Mingw-w64
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AC_TYPE_LONG_LONG_INT
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# egrep is used in lib/Makefile.am
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AC_PROG_EGREP
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### We need iconv for unicode support (Qt frontend requires it too)
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LYX_USE_INCLUDED_ICONV
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@ -86,4 +86,4 @@ What's new
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* BUILD/INSTALLATION
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- Fix 'make install' target for autotools builds with autoconf >= 2.72.
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