Fix installation on CentOS 7

Change-Id: I673e89d567a23376655320ce9edce0fefc0f2d8c
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 684754c..322df37 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,23 +1,24 @@
 cmake_minimum_required(VERSION 3.9)
 project(collocatordb VERSION 1.2.0 DESCRIPTION "Storing and retrieving collocation counts based on RocksDB")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fno-rtti")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -fno-rtti -std=c++11 -std=gnu++11")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g")
 
 include(GNUInstallDirs)
-include_directories(/usr/local/include)
-find_library(ROCKSDB librocksdb.so.5.11)
+include_directories(/usr/local/include;/usr/local/kl/include)
+link_directories(/usr/local/lib;/usr/local/kl/lib)
+find_library(ROCKSDB NAMES librocksdb.so.5.11 librocksdb.so.5.10 librocksdb.so.5)
 find_library(ROCKSDB_STATIC librocksdb.a)
 
 enable_testing()
 add_library(collocatordb SHARED src/collocatordb.cc)
-target_link_libraries(collocatordb pthread rt snappy z bz2 lz4 zstd ${ROCKSDB})
+target_link_libraries(collocatordb pthread rt snappy z bz2 lz4 zstd ${ROCKSDB} dl)
 set_target_properties(collocatordb PROPERTIES
         VERSION ${PROJECT_VERSION}
         SOVERSION 1
         PUBLIC_HEADER src/collocatordb.h)
 
 add_library(collocatordb_static STATIC src/collocatordb.cc)
-target_link_libraries(collocatordb_static ${ROCKSDB_STATIC} pthread rt snappy z bz2 lz4 zstd)
+target_link_libraries(collocatordb_static ${ROCKSDB_STATIC} pthread rt snappy z bz2 lz4 zstd dl)
 
 add_executable(basic_test tests/basic_test.c tests/acutest.h)
 TARGET_LINK_LIBRARIES(basic_test ${ROCKSDB} collocatordb)