The standard version of ldd comes with glibc2. Libc5 came with an older
version, still present on some systems. The long options are not supported by
the libc5 version. On the other hand, the glibc2 version does not support
-V and only has the equivalent --version.
The libc5 version of this program will use the name of a library given on the
command line as-is when it contains a '/'; otherwise it searches for the
library in the standard locations. To run it on a shared library in the
current directory, prefix the name with "./".
ldd does not work on a.out shared libraries.
ldd does not work with some extremely old a.out programs which were built
before ldd support was added to the compiler releases. If you use
ldd on one of these programs, the program will attempt to run with
argc = 0 and the results will be unpredictable.