LD_LIBRARY_PATH exported but libdb-4.6.so not found

["Pablo Chamorro C." <pchamorro@ingeominas.gov.co>]

I updated from 2.4.21 to 2.4.23 in some old Fedoras and also in a CentOS 
5.4.

Before compiling, I run:

export LD_LIBRARY_PATH=/usr/local/BerkeleyDB.4.6/lib
export CPPFLAGS="-I/usr/local//BerkeleyDB.4.6/include"
export LDFLAGS="-L/usr/local/BerkeleyDB.4.6/lib"

and it compiles ok. But after installed, in 3 out 4 of the used servers, slapd 
doesn't start unless I execute first:

export LD_LIBRARY_PATH=/usr/local/BerkeleyDB.4.6/lib

Attached, the output of ldd /usr/local/libexec/slapd, before and after running 
export LD_LIBRARY_PATH=/usr/local/BerkeleyDB.4.6/lib. In short:

without LD_LIBRARY_PATH defined:

        libdb-4.6.so => not found

with LD_LIBRARY_PATH as above:

        libdb-4.6.so => /usr/local/BerkeleyDB.4.6/lib/libdb-4.6.so (0x00002b4eb2c16000)

Could you please explain me why this might be happening? Is this a bug? This 
issue ocurred to me in at least 3 server, but I have another CentOS 5.4, where 
the compilation and the install process run just fine, and I didn't need that 
workaround.

Thank you,

Pablo Chamorro

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[root@linux ~]# ldd /usr/local/libexec/slapd
        libltdl.so.3 => /usr/lib64/libltdl.so.3 (0x0000003a28c00000)
        libuuid.so.1 => /lib64/libuuid.so.1 (0x0000003a28800000)
        libdb-4.6.so => not found
        libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003a28400000)
        libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0x0000003e18200000)
        libssl.so.6 => /lib64/libssl.so.6 (0x00000039a8c00000)
        libcrypto.so.6 => /lib64/libcrypto.so.6 (0x00000039a8800000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x0000003a31400000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x0000003a2b000000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003a27800000)
        libdl.so.2 => /lib64/libdl.so.2 (0x0000003a27c00000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003a27400000)
        libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2 (0x00000039eb800000)
        libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x00000039eb000000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x0000003a2b400000)
        libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0x00000039eb400000)
        libz.so.1 => /lib64/libz.so.1 (0x000000329fa00000)
        libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x00000039eac00000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x0000003a2c000000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003a29000000)
        libsepol.so.1 => /lib64/libsepol.so.1 (0x00002b62fa50c000)
[root@linux ~]#
[root@linux ~]# export LD_LIBRARY_PATH=/usr/local/BerkeleyDB.4.6/lib
[root@linux ~]#
[root@linux ~]# ldd /usr/local/libexec/slapd
        libltdl.so.3 => /usr/lib64/libltdl.so.3 (0x0000003a28c00000)
        libuuid.so.1 => /lib64/libuuid.so.1 (0x0000003a28800000)
        libdb-4.6.so => /usr/local/BerkeleyDB.4.6/lib/libdb-4.6.so (0x00002b4eb2c16000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x0000003a28400000)
        libsasl2.so.2 => /usr/lib64/libsasl2.so.2 (0x0000003e18200000)
        libssl.so.6 => /lib64/libssl.so.6 (0x00000039a8c00000)
        libcrypto.so.6 => /lib64/libcrypto.so.6 (0x00000039a8800000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x0000003a31400000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x0000003a2b000000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003a27800000)
        libdl.so.2 => /lib64/libdl.so.2 (0x0000003a27c00000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003a27400000)
        libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2 (0x00000039eb800000)
        libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x00000039eb000000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x0000003a2b400000)
        libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0x00000039eb400000)
        libz.so.1 => /lib64/libz.so.1 (0x000000329fa00000)
        libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x00000039eac00000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x0000003a2c000000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x0000003a29000000)
        libsepol.so.1 => /lib64/libsepol.so.1 (0x00002b4eb2f43000)