Mysterious /usr/lib/libltdl.a on my Mavericks system

libltdl.a

# libltdl.la - a libtool library file
# Generated by ltmain.sh - GNU libtool 1.5 (1.1220 2003/04/05 19:32:58)
#
# Please DO NOT delete this file!
# It is necessary for linking the library.

# The name that we can dlopen(3).
dlname='libltdl.3.dylib'

# Names of this library.
library_names='libltdl.3.dylib libltdl.dylib libltdl.3.1.0.dylib'

# The name of the static archive.
old_library='libltdl.a'

# Libraries that this one depends upon.
dependency_libs=' -ldl'

# Version information for libltdl.
current=4
age=1
revision=0

# Is this an already installed library?
installed=yes

# Should we warn about portability when linking against -modules?
shouldnotlink=no

# Files to dlopen/dlpreopen
dlopen=''
dlpreopen=''

# Directory that this library needs to be installed in:
libdir='/usr/lib'

libltdl.a.timestamp

-rwxr-xr-x  1 root  wheel  794 Apr 20  2007 /usr/lib/libltdl.la