Fix loading of plugins.

The wrong directory was used.

ConfigureChecks.cmake

@@ -9,7 +9,7 @@ set(PACKAGE ${APPLICATION_NAME})
 set(VERSION ${APPLICATION_VERSION})
 set(DATADIR ${DATA_INSTALL_DIR})
 set(LIBDIR ${LIB_INSTALL_DIR})
-set(PLUGINDIR ${PLUGIN_INSTALL_DIR})
+set(PLUGINDIR "${PLUGIN_INSTALL_DIR}-${LIBRARY_SOVERSION}")
 set(SYSCONFDIR ${SYSCONF_INSTALL_DIR})
 
 set(BINARYDIR ${CMAKE_BINARY_DIR})

config.h.cmake

@@ -3,7 +3,7 @@
 #cmakedefine LOCALEDIR "${LOCALE_INSTALL_DIR}"
 #cmakedefine DATADIR "${SHARE_INSTALL_PREFIX}"
 #cmakedefine LIBDIR "${LIB_INSTALL_DIR}"
-#cmakedefine PLUGINDIR "${PLUGIN_INSTALL_DIR}"
+#cmakedefine PLUGINDIR "${PLUGINDIR}"
 #cmakedefine SYSCONFDIR "${SYSCONFDIR}"
 #cmakedefine BINARYDIR "${BINARYDIR}"
 #cmakedefine SOURCEDIR "${SOURCEDIR}"