Hi, I have been trying to install OpenLDAP 2.6 in RHEL 7.9. At my first attempt it was failed as it requires openssl version 1.1.1 or greater. I had installed 1.1.1l as earlier version was openssl 1.0.2k. (installed with "./config --prefix=/usr --openssldir=/etc/ssl --libdir=lib shared" from the directory /usr/local/src/openssl-1.1.1l as root account and export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64 echo "export LD_LIBRARY_PATH=/usr/local/lib:/usr/local/lib64" >> ~/.bashrc) Verified openssl vesrion # openssl version OpenSSL 1.1.1l 24 Aug 2021 # which openssl /bin/openssl # openssl version -d OPENSSLDIR: "/usr/local/ssl" Now when I tried openldap 2.6 again I am getting below error ------ checking for sys/un.h... yes checking openssl/ssl.h usability... yes checking openssl/ssl.h presence... yes checking for openssl/ssl.h... yes checking for SSL_export_keying_material_early in -lssl... no configure: error: Could not locate TLS/SSL package ------ I am trying to run below config vi /root/.ldap-env -------- export PATH=/opt/orsus/openldap-2.6/bin:/opt/orsus/openldap-2.6/sbin:/opt/orsus/openldap-2.6/libexec:$PATH export OWNER=ldap:ldap export CONFIG=/opt/orsus/openldap-2.6/etc/openldap/slapd.d -------- source /root/.ldap-env ./configure --with-cyrus-sasl --with-argon2 --with-systemd --with-tls=openssl --enable-overlays=mod --enable-backends=mod --disable-perl --disable-ndb --enable-crypt --enable-modules --enable-dynamic --enable-syslog --enable-debug --enable-local --enable-spasswd --disable-sql --disable-hdb --disable-bdb --prefix=/opt/orsus/openldap-2.6.0 I have tried below but still no luck. LDFLAGS="-L/usr/lib64/openssl -Wl,-rpath,/usr/include/openssl" CPPFLAGS="-I/usr/include/openssl" export CPPFLAGS export LDFLAGS Kindly help me. Thank you!!