testsuite/classes.sed - toolchain/sed - Git at Google

 # inspired by an autoconf generated configure script.
 s/^\([/[:lower:]A-Z0-9]*_cv_[[:lower:][:upper:]/[:digit:]]*\)=\(.*\)/: \${\1='\2'}/p
	# inspired by an autoconf generated configure script.
	s/^\([/[:lower:]A-Z0-9]_cv_[[:lower:][:upper:]/[:digit:]]\)=\(.*\)/: \${\1='\2'}/p