Fix caching of libev configuration

cmake/FindLibEV.cmake

@@ -8,6 +8,10 @@ IF(LIBEV_PATH)
 	SET(LIBEV_LIBDIR "${LIBEV_PATH}/lib" CACHE PATH "Path containing libev" FORCE)
 ENDIF(LIBEV_PATH)
 
+IF(LIBEV_INCLUDE_PATH)
+	INCLUDE_DIRECTORIES(${LIBEV_INCLUDE_PATH})
+ENDIF(LIBEV_INCLUDE_PATH)
+
 # Use cached result
 IF(NOT LIBEV_FOUND)
 	UNSET(HAVE_EV_H)
@@ -25,9 +29,8 @@ IF(NOT LIBEV_FOUND)
 # 			MESSAGE(STATUS "Looking for lib ev in ${LIBEV_LIBDIR}")
 			CHECK_LIBRARY_EXISTS(ev ev_loop "${LIBEV_LIBDIR}" HAVE_LIBEV)
 			IF(HAVE_LIBEV)
-				INCLUDE_DIRECTORIES(${LIBEV_INCLUDE_PATH})
-				SET(LIBEV_CFLAGS "")
-				SET(LIBEV_LDFLAGS "-L${LIBEV_LIBDIR} -lev")
+				SET(LIBEV_CFLAGS "" CACHE INTERNAL "")
+				SET(LIBEV_LDFLAGS "-L${LIBEV_LIBDIR} -lev" CACHE INTERNAL "")
 				SET(LIBEV_FOUND TRUE CACHE INTERNAL "Found libev" FORCE)
 			ELSE(HAVE_LIBEV)
 				MESSAGE(STATUS "Couldn't find lib ev in ${LIBEV_LIBDIR}")
@@ -44,8 +47,8 @@ IF(NOT LIBEV_FOUND)
 # 				MESSAGE(STATUS "Looking for lib ev")
 				CHECK_LIBRARY_EXISTS(ev ev_loop "" HAVE_LIBEV)
 				IF(HAVE_LIBEV)
-					SET(LIBEV_CFLAGS "")
-					SET(LIBEV_LDFLAGS "-lev")
+					SET(LIBEV_CFLAGS "" CACHE INTERNAL "")
+					SET(LIBEV_LDFLAGS "-lev" CACHE INTERNAL "")
 					SET(LIBEV_FOUND TRUE CACHE INTERNAL "Found libev" FORCE)
 				ELSE(HAVE_LIBEV)
 					MESSAGE(STATUS "Couldn't find lib ev")