Issue

When curl on rhel 5.9 is used to query LDAP servers, it can't locate liblber.so and libldap.so:

curl -k --connect-timeout 4 ldap://intlxvm1/ou=profile,dc=example,dc=example,dc=com??one?"(&(objectClass=DUAConfigProfile)(cn=example.com.au))"
curl: (40) The liblber.so LDAP library/libraries couldn't be opened

When a symlink /usr/lib64/liblber.so to /usr/lib64/liblber-2.3.so.0.2.31, curl produce another error:

curl -k --connect-timeout 4 ldap://intlxvm1/ou=profile,dc=example,dc=example,dc=com??one?"(&(objectClass=DUAConfigProfile)(cn=example.com.au))"
curl: (40) The libldap.so LDAP library/libraries couldn't be opened

$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.9 (Tikanga)

$ rpm -qf /usr/lib/liblber-2.3.so.0.2.31
openldap-2.3.43-25.el5_8.1

$ rpm -qf /usr/lib/libldap-2.3.so.0.2.31
openldap-2.3.43-25.el5_8.1

ldd /usr/bin/curl
        linux-vdso.so.1 =>  (0x00007fffdf9fd000)
        libcurl.so.3 => /usr/lib64/libcurl.so.3 (0x0000003cd3e00000)
        libdl.so.2 => /lib64/libdl.so.2 (0x0000003cd2600000)
        libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2 (0x0000003cd3200000)
        libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x0000003cd6600000)
        libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0x0000003cd6a00000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x0000003cd4600000)
        libidn.so.11 => /usr/lib64/libidn.so.11 (0x0000003cd3600000)
        libssl.so.6 => /lib64/libssl.so.6 (0x0000003cd5200000)
        libcrypto.so.6 => /lib64/libcrypto.so.6 (0x0000003cd4a00000)
        libz.so.1 => /lib64/libz.so.1 (0x0000003cd4200000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003cd2200000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003cd1e00000)
        libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x0000003cd6e00000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x0000003cd6200000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x0000003cd3a00000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003cd2e00000)
        libsepol.so.1 => /lib64/libsepol.so.1 (0x0000003cd2a00000)

readelf -d /usr/bin/curl

Dynamic section at offset 0xe2c0 contains 34 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libcurl.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libdl.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libgssapi_krb5.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libkrb5.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libk5crypto.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libcom_err.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libidn.so.11]
 0x0000000000000001 (NEEDED)             Shared library: [libssl.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libcrypto.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libz.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000c (INIT)               0x4018d8
 0x000000000000000d (FINI)               0x408f18
 0x000000006ffffef5 (GNU_HASH)           0x400240
 0x0000000000000005 (STRTAB)             0x60e860
 0x0000000000000006 (SYMTAB)             0x4002a0
 0x000000000000000a (STRSZ)              1138 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0x60e4f8
 0x0000000000000002 (PLTRELSZ)           1920 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x401158
 0x0000000000000007 (RELA)               0x4010f8
 0x0000000000000008 (RELASZ)             96 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffe (VERNEED)            0x4010b8
 0x000000006fffffff (VERNEEDNUM)         1
 0x000000006ffffff0 (VERSYM)             0x400ffa
 0x000000006ffffef9 (GNU_LIBLIST)        0x400b88
 0x000000006ffffdf7 (GNU_LIBLISTSZ)      340 (bytes)
 0x000000006ffffef8 (GNU_CONFLICT)       0x60ed40
 0x000000006ffffdf6 (GNU_CONFLICTSZ)     936 (bytes)
 0x0000000000000000 (NULL)               0x0

It seems that curl was not compiled using RHEL 5.9 liblber abd libldap to record their soname.