Currently, mariadb-devel includes
Requires: openssl-devel

despite itself being built using compat-openssl10-devel, and due to bug #1400231 that openssl-devel and compat-openssl10-devel currently conflict, means anything depending on mariadb-devel to build has to choose one or the other.

My initial suggestion would be something like (unless you have a better idea)

diff --git a/mariadb.spec b/mariadb.spec
index 29e2700..76f5c29 100644
--- a/mariadb.spec
+++ b/mariadb.spec
@@ -124,7 +124,7 @@
 
 Name:             mariadb
 Version:          %{compatver}.%{bugfixver}
-Release:          5%{?with_debug:.debug}%{?dist}
+Release:          6%{?with_debug:.debug}%{?dist}
 Epoch:            3
 
 Summary:          A community developed branch of MySQL
@@ -451,7 +451,7 @@ or products (such as Excel), or data retrieved from the environment
 Summary:          Files for development of MariaDB/MySQL applications
 Group:            Applications/Databases
 %{?with_clibrary:Requires:         %{name}-libs%{?_isa} = %{sameevr}}
-Requires:         openssl-devel%{?_isa}
+Requires:         pkgconfig(openssl)
 %if %{with mysql_names}
 Provides:         mysql-devel = %{sameevr}
 Provides:         mysql-devel%{?_isa} = %{sameevr}
@@ -1334,6 +1334,9 @@ fi
 %endif
 
 %changelog
+* Wed Nov 30 2016 Rex Dieter <rdieter> - 3:10.1.19-6
+- -devel: use pkgconfig(openssl) to allow any implementation (like compat-openssl10)
+
 * Wed Nov 30 2016 Michal Schorm <mschorm> - 3:10.1.19-5
 - Testsuite blacklists heavily updated. Current tracker: #1399847