title: SSE instruction set not enabled
body: <p>I am getting trouble with this error: <em>"SSE instruction set not enabled"</em>. How I can figure this out?</p>
  
  <p>I have ACER i7, Ubuntu 11.10, please any one can help me?</p>
  
  <p>Any help will be appreciated!</p>
  
  <hr>
  
  <p>Also running:</p>
  
  <pre class="lang-none prettyprint-override"><code> sudo cat /proc/cpuinfo | grep flags
  </code></pre>
  
  <p>Gives:</p>
  
  <pre class="lang-none prettyprint-override"><code>flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clfl
  ush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx rdtscp lm constant_tsc arch_perfm
  on pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl
  vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 x2apic popcnt xsave avx lahf_lm 
  ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid
  </code></pre>
  
  <p>Actually i was trying to install gazebo-1.0.0-RC2-x86_64, and getting this error.</p>
  
  <pre class="lang-none prettyprint-override"><code>/usr/lib/gcc/i686-linux-gnu/4.6.1/include/emmintrin.h:32:3: error: #error "SSE2 
  instruction set not enabled"
  In file included from /home/bkhelifa/Downloads/software/gazebo-1.0.0-RC2-x86_64/
  deps/opende/src/quickstep.cpp:39:0:
  /usr/lib/gcc/i686-linux-gnu/4.6.1/include/xmmintrin.h:32:3: error: #error "SSE i
  nstruction set not enabled"
  /home/bkhelifa/Downloads/software/gazebo-1.0.0-RC2-x86_64/deps/opende/src/quicks
  tep.cpp: In function ‘dReal dot6(dRealPtr, dRealPtr)’:
  /home/bkhelifa/Downloads/software/gazebo-1.0.0-RC2-x86_64/deps/opende/src/quicks
  tep.cpp:537:3: error: ‘__m128d’ was not declared in this scope
  ...
  </code></pre>
  
  <hr>
  
  <p>I already have this option in my cmakefile</p>
  
  <pre class="lang-cmake prettyprint-override"><code>if (SSE3_FOUND)
    set (CMAKE_C_FLAGS_ALL "${CMAKE_C_FLAGS_ALL} -msse3")
  endif()
  if (SSSE3_FOUND)
    set (CMAKE_C_FLAGS_ALL "${CMAKE_C_FLAGS_ALL} -mssse3")
  endif()
  if (SSE4_1_FOUND)
    set (CMAKE_C_FLAGS_ALL "${CMAKE_C_FLAGS_ALL} -msse4.1")
  endif()
  if (SSE4_2_FOUND)
    set (CMAKE_C_FLAGS_ALL "${CMAKE_C_FLAGS_ALL} -msse4.2")
  endif()
  </code></pre>