Makefile: fix stray \ warnings with grep-3.8 #10198
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head is not necessary here. Signed-off-by: Rosen Penev <rosenp@gmail.com>
We simply grep for "/usr". So no need for "-E" or "\/". Furthermore, in the new grep versions this creates warnings. As written in the grep-3.8 announcement: Regular expressions with stray backslashes now cause warnings, as their unspecified behavior can lead to unexpected results. For example, '\a' and 'a' are not always equivalent <https://bugs.gnu.org/39678>. Fixes warnings in the form of: grep: warning: stray \ before / Signed-off-by: Nick Hainke <vincent@systemli.org>
Fixes build warnings when using newer versions of grep. Signed-off-by: Chris Osgood <chris_github@functionalfuture.com> Tested-by: Georgi Valkov <gvalkov@gmail.com>
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Build system: Ubuntu 20.04.5 x86_64 with grep-3.8
Build-tested: ipq807x/QNAP_301w
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