configure.ac: Check for grep with AC_PROG_GREP
Perhaps with a new version of autoconf, I began seeing: | checking the name lister (/usr/bin/nm -B) interface... ./configure: line 6973: External.*some_variable: command not found | BSD nm This is because AC_PROG_NM expands to ... if $GREP 'External.*some_variable' conftest.out > /dev/null; then lt_cv_nm_interface="MS dumpbin" fi ... I'm not sure if it's a bug in AC_PROG_NM that it doesn't call AC_PROG_GREP, but it's easy enough for us to do it.
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