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Since commit 5ef597fcaa290267e8cffe33b60b870cda0d52fa the autotools-autoconf
package forces a very specific and recent M4 version. Otherwise it fails
with:
checking for GNU M4 that supports accurate traces...
configure: error: no acceptable m4 could be found in $PATH.
GNU M4 1.4.6 or later is required; 1.4.16 or newer is recommended.
GNU M4 1.4.15 uses a buggy replacement strstr on some systems.
Glibc 2.9 - 2.12 and GNU M4 1.4.11 - 1.4.15 have another strstr bug.
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
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