diff --git a/similarity_search/CMakeLists.txt b/similarity_search/CMakeLists.txt
index 1451b30..2ad020f 100644
--- a/similarity_search/CMakeLists.txt
+++ b/similarity_search/CMakeLists.txt
@@ -42,17 +42,17 @@ if(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
         message(FATAL_ERROR "GCC version must be at least 4.7!")
     endif()
     # Uncomment the following lines to see how the code compiles without AVX,SSE4.2 and/or SSE2
-    #set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lm -lrt -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -fpic -march=x86-64")
-    #set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lm -lrt -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -fpic -march=core2")
-    #set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lm -lrt -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -fpic -msse4.2")
-    set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Wcast-align -Ofast -lm -lrt -DNDEBUG -std=c++11 -pthread  -DHAVE_CXX0X -march=native -Wl,--no-as-needed -fpic")
-    set (CMAKE_CXX_FLAGS_DEBUG   "-Wall -Wunreachable-code -Wcast-align -ggdb  -lm -lrt -DNDEBUG -std=c++11 -pthread  -DHAVE_CXX0X -march=native -Wl,--no-as-needed -fpic")
+    #set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lm -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -fpic -march=x86-64")
+    #set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lm -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -fpic -march=core2")
+    #set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lm -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -fpic -msse4.2")
+    set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Wcast-align -Ofast -lm -DNDEBUG -std=c++11 -pthread  -DHAVE_CXX0X -march=native -Wl,--no-as-needed -fpic")
+    set (CMAKE_CXX_FLAGS_DEBUG   "-Wall -Wunreachable-code -Wcast-align -ggdb  -lm -DNDEBUG -std=c++11 -pthread  -DHAVE_CXX0X -march=native -Wl,--no-as-needed -fpic")
 elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
     if (CXX_COMPILER_VERSION VERSION_LESS 14.0.1)
         message(FATAL_ERROR "Intel version must be at least 14.0.1!")
     endif()
-    set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -lrt -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -march=native -fpic")
-    set (CMAKE_CXX_FLAGS_DEBUG   "-Wall -Wunreachable-code -ggdb  -lrt -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -march=native -fpic")
+    set (CMAKE_CXX_FLAGS_RELEASE "-Wall -Wunreachable-code -Ofast -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -march=native -fpic")
+    set (CMAKE_CXX_FLAGS_DEBUG   "-Wall -Wunreachable-code -ggdb  -DNDEBUG -std=c++11 -DHAVE_CXX0X -pthread -march=native -fpic")
 elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
     if (CXX_COMPILER_VERSION VERSION_LESS 4.2.1)
         message(FATAL_ERROR "Clang version must be at least 3.4 (GCC >= 4.2.1 equivalent)!")