The find-provides script does not correctly extract symbol versions when locale is not english, because the objdump output can be localized.
Thus, this will not work as expected with a non-english locale:
	    objdump -p $f 2>/dev/null | awk '
		BEGIN { START=0 ; }
		/Version definitions:/ { START=1; }
		/^[0-9]/ && (START==1) { print $4; }
		/^$/ { START=0; }
	    '

For example, when rebuilding gcc with a french locale, the generated libstdc++6 package is missing this kind of provides:
libstdc++.so.6(CXXABI_TM_1)
libstdc++.so.6(CXXABI_TM_1)(64bit)
libstdc++.so.6(GLIBCXX_3.4)
libstdc++.so.6(GLIBCXX_3.4)(64bit)