GLIBC_2.1 __librt_version_placeholder F
GLIBC_2.2 __librt_version_placeholder F
GLIBC_2.3.3 __librt_version_placeholder F
GLIBC_2.3.4 __librt_version_placeholder F
GLIBC_2.4 __librt_version_placeholder F
GLIBC_2.7 __librt_version_placeholder F