openssl issue while installing apache 2.4.23

I'm trying to install apache2.4.23 on centos 6.8 and i'm getting this : ab.c: In function 'main': ab.c:2398: warning: implicit declaration of function 'SSLv2_client_method' ab.c:2398: warning: assignment makes pointer from integer without a cast ab.c:2412: warning: 'TLSv1_1_client_method' is deprecated (declared at /usr/local/include/openssl/ssl.h:1604) ab.c:2414: warning: 'TLSv1_2_client_method' is deprecated (declared at /usr/local/include/openssl/ssl.h:1610) ab.c:2417: warning: 'TLSv1_client_method' is deprecated (declared at /usr/local/include/openssl/ssl.h:1598) ab.c:2468: warning: implicit declaration of function 'CRYPTO_malloc_init' /usr/share/apr-1/build/libtool --silent --mode=link gcc -std=gnu99 -g -O2 -pthread -L/opt/httpd-2.4.25/lib -lssl -lcrypto -lrt -lcrypt -lpthread \ -o ab ab.lo /usr/lib64/libaprutil-1.la -ldb-4.7 -lexpat -ldb-4.7 /usr/lib/libapr-1.la -lrt -lcrypt -lpthread -lm ab.o: In function `main': /opt/httpd-2.4.25/support/ab.c:2468: undefined reference to `CRYPTO_malloc_init' /opt/httpd-2.4.25/support/ab.c:2398: undefined reference to `SSLv2_client_method' collect2: ld returned 1 exit status make: *** [ab] Erreur 1 make: quittant le répertoire « /opt/httpd-2.4.25/support » make: *** [all-recursive] Erreur 1 make: quittant le répertoire « /opt/httpd-2.4.25/support » make: *** [all-recursive] Erreur I tried installing openssl 1.1.0 and reconfigure the installation of apache with : ./configure --enable-layout=admin --enable-mpms-shared=all --with-ssl=/usr/local/bin/openssl Still getting the same problem, any ideas ?