diff --git a/CMakeLists.txt b/CMakeLists.txt
index 021ffc30..5977b132 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -143,8 +143,13 @@ if (CMAKE_CXX_COMPILER_ID MATCHES GNU)
 
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -maes -Wall -Wno-strict-aliasing")
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Ofast -funroll-loops -fvariable-expansion-in-unroller -ftree-loop-if-convert-stores -fmerge-all-constants -fbranch-target-load-optimize2")
+    # Hacks againts EL7
+    if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "7.1")
+	    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes -Wall -std=c++14 -fno-exceptions -fno-rtti")
+    else()
+	    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes -Wall -std=c++11 -fno-exceptions -fno-rtti")
+    endif()
 
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes -Wall -std=c++14 -fno-exceptions -fno-rtti")
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Ofast -s -funroll-loops -fvariable-expansion-in-unroller -ftree-loop-if-convert-stores -fmerge-all-constants -fbranch-target-load-optimize2")
 
     if (WIN32)
@@ -169,7 +174,13 @@ elseif (CMAKE_CXX_COMPILER_ID MATCHES Clang)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -maes -Wall")
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -Ofast -funroll-loops -fmerge-all-constants")
 
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes -Wall -std=c++14 -fno-exceptions -fno-rtti")
+    # Hacks againts EL7
+    if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "7.1")
+	    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes -Wall -std=c++14 -fno-exceptions -fno-rtti")
+    else()
+    	    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -maes -Wall -std=c++11 -fno-exceptions -fno-rtti")
+    endif()
+
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Ofast -funroll-loops -fmerge-all-constants")
 
 endif()