/bin/sed works on both Solaris and RedHat Linux; /usr/bin/sed does not.

Doc/tools/fix_libaux.sed

-#! /usr/bin/sed -f
+#! /bin/sed -f
 s/{\\tt  \\hackscore  {}\\hackscore  {}/\\sectcode{__/
 s/\\hackscore  {}\\hackscore  {}/__/