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From: Jory A. Pratt <anarchy@gentoo.org>
Note: the first occurrence of :space: is [:space:] (with a single pair
of []), where it should be [[:space:]] (with two pairs of []).
This causes the sed command to fail (with the error message quoted in
my original report), driving to failure the whole configure step.
https://bugzilla.mozilla.org/show_bug.cgi?id=1329252
diff --git a/build/autoconf/icu.m4 b/build/autoconf/icu.m4
--- a/build/autoconf/icu.m4
+++ b/build/autoconf/icu.m4
@@ -70,7 +70,7 @@
fi
fi
- version=`sed -n 's/^[[:space:]]*#[[:space:]]*define[[:space:]][[:space:]]*U_ICU_VERSION_MAJOR_NUM[[:space:]][[:space:]]*\([0-9][0-9]*\)[[:space:]]*$/\1/p' "$icudir/common/unicode/uvernum.h"`
+ version=`sed -n 's/^[[[:space:]]]*#[[:space:]]*define[[:space:]][[:space:]]*U_ICU_VERSION_MAJOR_NUM[[:space:]][[:space:]]*\([0-9][0-9]*\)[[:space:]]*$/\1/p' "$icudir/common/unicode/uvernum.h"`
if test x"$version" = x; then
AC_MSG_ERROR([cannot determine icu version number from uvernum.h header file $lineno])
fi
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