require glibc-debuginfo for valgrind-enabled build
    
    ... as suggested by valgrind itself:
    
    valgrind:  Fatal error at startup: a function redirection
    valgrind:  which is mandatory for this platform-tool combination
    valgrind:  cannot be set up.  Details of the redirection are:
    valgrind:
    valgrind:  A must-be-redirected function
    valgrind:  whose name matches the pattern:      strlen
    valgrind:  in an object with soname matching:   ld-linux-x86-64.so.2
    valgrind:  was not found whilst processing
    valgrind:  symbols from the object with soname: ld-linux-x86-64.so.2
    valgrind:
    valgrind:  Possible fixes: (1, short term): install glibc's debuginfo
    valgrind:  package on this machine.  (2, longer term): ask the packagers
    valgrind:  for your Linux distribution to please in future ship a non-
    valgrind:  stripped ld.so (or whatever the dynamic linker .so is called)
    valgrind:  that exports the above-named function using the standard
    valgrind:  calling conventions for this platform.  The package you need
    valgrind:  to install for fix (1) is called
    valgrind:
    valgrind:    On Debian, Ubuntu:                 libc6-dbg
    valgrind:    On SuSE, openSuSE, Fedora, RHEL:   glibc-debuginfo
    valgrind:
    valgrind:  Note that if you are debugging a 32 bit process on a
    valgrind:  64 bit system, you will need a corresponding 32 bit debuginfo
    valgrind:  package (e.g. libc6-dbg:i386).
    valgrind:
    valgrind:  Cannot continue -- exiting now.  Sorry.