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Upstream patch for building with mariadb:
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Taken from https://bz.apache.org/bugzilla/show_bug.cgi?id=61517
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1494093
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--- a/build/dbd.m4	2017-05-03 19:18:52.000000000 -0400
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+++ a/build/dbd.m4	2017-09-13 16:58:07.369546391 -0400
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@@ -163,10 +163,15 @@ 
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   old_cppflags="$CPPFLAGS"
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   old_ldflags="$LDFLAGS"
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+  my_library="mysqlclient"
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+
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   AC_ARG_WITH([mysql], APR_HELP_STRING([--with-mysql=DIR], [enable MySQL DBD driver]),
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   [
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     if test "$withval" = "yes"; then
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       AC_PATH_PROG([MYSQL_CONFIG],[mysql_config])
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+      if test "x$MYSQL_CONFIG" = "x"; then
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+        AC_PATH_PROG([MYSQL_CONFIG],[mariadb_config])
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+      fi
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       if test "x$MYSQL_CONFIG" != 'x'; then
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         mysql_CPPFLAGS="`$MYSQL_CONFIG --include`"
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         mysql_LDFLAGS="`$MYSQL_CONFIG --libs_r | sed -e 's/-l[[^ ]]\+//g'`"
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@@ -174,32 +179,40 @@ 
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         APR_ADDTO(CPPFLAGS, [$mysql_CPPFLAGS])
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         APR_ADDTO(LIBS, [$mysql_LIBS])
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+
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+	if $MYSQL_CONFIG --libs_r | grep -q mariadb; then
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+	  my_library="mariadb"
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+	fi
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       fi
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-      AC_CHECK_HEADERS([mysql.h my_global.h my_sys.h],
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-                       AC_CHECK_LIB(mysqlclient, mysql_init, [apu_have_mysql=1]),
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-                       [apu_have_mysql=0; break],
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-                       [#include <my_global.h>])
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-      if test "$apu_have_mysql" = "0"; then
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-        AC_CHECK_HEADERS([mysql/mysql.h mysql/my_global.h mysql/my_sys.h],
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-                         AC_CHECK_LIB(mysqlclient, mysql_init, [apu_have_mysql=1]),
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-                         [apu_have_mysql=0; break],
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-                         [#include <mysql/my_global.h>])
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+      AC_CHECK_HEADERS([mysql.h errmsg.h], [apu_have_mysql=1], [apu_have_mysql=0; break])
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+      if test "$apr_have_mysql" = "0"; then
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+	AC_CHECK_HEADERS([mysql/mysql.h mysql/errmsg.h], [apu_have_mysql=1], [apu_have_mysql=0; break])
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       fi
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-      if test "$apu_have_mysql" != "0" && test "x$MYSQL_CONFIG" != 'x'; then
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-        APR_ADDTO(APRUTIL_PRIV_INCLUDES, [$mysql_CPPFLAGS])
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+      if test "$apr_have_mysql" = "1"; then
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+	AC_CHECK_HEADERS([my_global.h my_sys.h mysql/my_global.h mysql/my_sys.h])
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+	AC_CHECK_LIB($my_library, mysql_init,, [apu_have_mysql=0])
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+      fi
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+      if test "$apu_have_mysql" = "1" && test "x$MYSQL_CONFIG" != 'x'; then
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+	APR_ADDTO(APRUTIL_PRIV_INCLUDES, [$mysql_CPPFLAGS])
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       fi
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     elif test "$withval" = "no"; then
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       :
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     else
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       AC_PATH_PROG([MYSQL_CONFIG],[mysql_config],,[$withval/bin])
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+      if test "x$MYSQL_CONFIG" = "x"; then
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+	AC_PATH_PROG([MYSQL_CONFIG],[mariadb_config],,[$withval/bin])
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+      fi
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       if test "x$MYSQL_CONFIG" != 'x'; then
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-        mysql_CPPFLAGS="`$MYSQL_CONFIG --include`"
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-        mysql_LDFLAGS="`$MYSQL_CONFIG --libs_r | sed -e 's/-l[[^ ]]\+//g'`"
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-        mysql_LIBS="`$MYSQL_CONFIG --libs_r`"
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+	mysql_CPPFLAGS="`$MYSQL_CONFIG --include`"
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+	mysql_LDFLAGS="`$MYSQL_CONFIG --libs_r | sed -e 's/-l[[^ ]]\+//g'`"
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+	mysql_LIBS="`$MYSQL_CONFIG --libs_r`"
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+	if $MYSQL_CONFIG --libs_r | grep -q mariadb; then
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+	  my_library="mariadb"
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+	fi
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       else
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-        mysql_CPPFLAGS="-I$withval/include"
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-        mysql_LDFLAGS="-L$withval/lib "
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+	mysql_CPPFLAGS="-I$withval/include"
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+	mysql_LDFLAGS="-L$withval/lib "
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       fi
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       APR_ADDTO(CPPFLAGS, [$mysql_CPPFLAGS])
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@@ -207,18 +220,15 @@ 
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       APR_ADDTO(LIBS, [$mysql_LIBS])
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       AC_MSG_NOTICE(checking for mysql in $withval)
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-      AC_CHECK_HEADERS([mysql.h my_global.h my_sys.h],
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-                       AC_CHECK_LIB(mysqlclient, mysql_init, [apu_have_mysql=1]),
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-                       [apu_have_mysql=0; break],
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-                       [#include <my_global.h>])
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-
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-      if test "$apu_have_mysql" != "1"; then
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-        AC_CHECK_HEADERS([mysql/mysql.h mysql/my_global.h mysql/my_sys.h],
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-                         AC_CHECK_LIB(mysqlclient, mysql_init, [apu_have_mysql=1]),
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-                         [apu_have_mysql=0; break],
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-                         [#include <mysql/my_global.h>])
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+      AC_CHECK_HEADERS([mysql.h errmsg.h], [apu_have_mysql=1], [apu_have_mysql=0; break])
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+      if test "$apr_have_mysql" = "0"; then
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+	AC_CHECK_HEADERS([mysql/mysql.h mysql/errmsg.h], [apu_have_mysql=1], [apu_have_mysql=0; break])
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+      fi
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+      if test "$apr_have_mysql" = "1"; then
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+	AC_CHECK_HEADERS([my_global.h my_sys.h mysql/my_global.h mysql/my_sys.h])
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+	AC_CHECK_LIB($my_library, mysql_init,, [apu_have_mysql=0])
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       fi
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-      if test "$apu_have_mysql" != "0"; then
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+      if test "$apu_have_mysql" = "1"; then
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         APR_ADDTO(APRUTIL_PRIV_INCLUDES, [$mysql_CPPFLAGS])
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       fi
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     fi
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@@ -229,7 +239,7 @@ 
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   dnl Since we have already done the AC_CHECK_LIB tests, if we have it, 
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   dnl we know the library is there.
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   if test "$apu_have_mysql" = "1"; then
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-    APR_ADDTO(LDADD_dbd_mysql, [$mysql_LDFLAGS -lmysqlclient $mysql_LIBS])
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+    APR_ADDTO(LDADD_dbd_mysql, [$mysql_LDFLAGS -l$my_library $mysql_LIBS])
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   fi
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   AC_SUBST(LDADD_dbd_mysql)
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--- a/dbd/apr_dbd_mysql.c	2017-05-03 19:18:52.000000000 -0400
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+++ a/dbd/apr_dbd_mysql.c	2017-09-13 19:15:20.894368809 -0400
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@@ -1262,7 +1262,9 @@ 
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 static void dbd_mysql_init(apr_pool_t *pool)
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 {
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+#if MYSQL_VERSION_ID < 100000
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     my_init();
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+#endif
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     mysql_thread_init();
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     /* FIXME: this is a guess; find out what it really does */
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