include/prereq-build.mk: explicitly check for -f flag when using busybox time
On Debian, busybox does have a time applet, but it does not support the -f flag. Catch this in prereq check to give users to proper error message. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
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		| @@ -138,10 +138,10 @@ $(eval $(call SetupHostCommand,bzip2,Please install 'bzip2', \ | |||||||
| $(eval $(call SetupHostCommand,wget,Please install GNU 'wget', \ | $(eval $(call SetupHostCommand,wget,Please install GNU 'wget', \ | ||||||
| 	wget --version | grep GNU)) | 	wget --version | grep GNU)) | ||||||
|  |  | ||||||
| $(eval $(call SetupHostCommand,time,Please install GNU 'time' or BusyBox 'time', \ | $(eval $(call SetupHostCommand,time,Please install GNU 'time' or BusyBox 'time' that supports -f, \ | ||||||
| 	gtime --version 2>&1 | grep GNU, \ | 	gtime --version 2>&1 | grep GNU, \ | ||||||
| 	time --version 2>&1 | grep GNU, \ | 	time --version 2>&1 | grep GNU, \ | ||||||
| 	busybox time 2>&1 | grep BusyBox)) | 	busybox time 2>&1 | grep -- '-f FMT')) | ||||||
|  |  | ||||||
| $(eval $(call SetupHostCommand,perl,Please install Perl 5.x, \ | $(eval $(call SetupHostCommand,perl,Please install Perl 5.x, \ | ||||||
| 	perl --version | grep "perl.*v5")) | 	perl --version | grep "perl.*v5")) | ||||||
|   | |||||||
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