title: CUDA 2.1 "error: unknown type name 'size_t'"
body: <p>System: Ubuntu 11.10 x86_64
  CUDA: v 2.1</p>
  
  <p>When trying to make an example program like matrixMul I get an extensive amount of errors, most of which are "unknown type name 'size_t'." I've made sure to put /usr/local/cuda/bin in my PATH as well as /usr/local/cuda/lib in a .conf in /etc/ld.so.conf.d. </p>
  
  <p>Any ideas why I'm getting these errors?</p>
  
  <pre><code>matrixMul$ make emu=1
  In file included from /tmp/tmpxft_00004089_00000000-1_matrixMul.cudafe1.stub.c:5:0,
                   from matrixMul.cu:196:
  /usr/local/cuda//bin/../include/crt/host_runtime.h:192:0: warning: "__device_fun" redefined [enabled by default]
  /usr/local/cuda//bin/../include/crt/host_runtime.h:215:0: note: this is the location of the previous definition
  /usr/local/cuda//bin/../include/crt/host_runtime.h:194:0: warning: "__device_var" redefined [enabled by default]
  /usr/local/cuda//bin/../include/crt/host_runtime.h:217:0: note: this is the location of the previous definition
  /usr/local/cuda//bin/../include/crt/host_runtime.h:196:0: warning: "__tex_var" redefined [enabled by default]
  /usr/local/cuda//bin/../include/crt/host_runtime.h:219:0: note: this is the location of the previous definition
  /usr/local/cuda//bin/../include/crt/host_runtime.h:198:0: warning: "__cudaFatCubin" redefined [enabled by default]
  /usr/local/cuda//bin/../include/crt/host_runtime.h:221:0: note: this is the location of the previous definition
  /usr/local/cuda//bin/../include/crt/host_runtime.h:208:0: warning: "__ids" redefined [enabled by default]
  /usr/local/cuda//bin/../include/crt/host_runtime.h:223:0: note: this is the location of the previous definition
  In file included from /usr/local/cuda//bin/../include/builtin_types.h:43:0,
                   from /usr/local/cuda//bin/../include/cuda_runtime_api.h:54,
                   from /usr/local/cuda//bin/../include/crt/host_runtime.h:80,
                   from /usr/include/c++/4.6/x86_64-linux-gnu/./bits/c++config.h:156:
  /usr/local/cuda//bin/../include/driver_types.h:184:3: error: unknown type name ‘size_t’
  ...
  /usr/local/cuda//bin/../include/driver_types.h:274:3: error: unknown type name ‘size_t’
  In file included from /usr/local/cuda//bin/../include/crt/host_runtime.h:80:0,
                   from /usr/include/c++/4.6/x86_64-linux-gnu/./bits/c++config.h:156:
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:102:46: error: unknown type name ‘size_t’
  ...
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:105:118: error: unknown type name ‘size_t’
  In file included from /usr/local/cuda//bin/../include/crt/host_runtime.h:80:0,
                   from /usr/include/c++/4.6/x86_64-linux-gnu/./bits/c++config.h:156:
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:110:48: error: unknown type name ‘size_t’
  In file included from /usr/local/cuda//bin/../include/crt/host_runtime.h:80:0,
                   from /usr/include/c++/4.6/x86_64-linux-gnu/./bits/c++config.h:156:
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:120:59: error: unknown type name ‘size_t’
  ...
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:121:110: error: unknown type name ‘size_t’
  In file included from /usr/local/cuda//bin/../include/crt/host_runtime.h:80:0,
                   from /usr/include/c++/4.6/x86_64-linux-gnu/./bits/c++config.h:156:
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:122:80: error: unknown type name ‘size_t’
  ...
  /usr/local/cuda//bin/../include/cuda_runtime_api.h:216:68: error: unknown type name ‘size_t’
  In file included from /usr/local/cuda//bin/../include/crt/host_runtime.h:226:0,
                   from /usr/lib/gcc/x86_64-linux-gnu/4.6.1/include/stddef.h:213:
  /usr/local/cuda//bin/../include/common_functions.h:70:1: error: unknown type name ‘clock_t’
  /usr/include/time.h:183:43: error: conflicting types for ‘clock’
  /usr/local/cuda//bin/../include/common_functions.h:72:10: note: previous implicit declaration of ‘clock’ was here
  ../../common/inc/cutil_inline_runtime.h:41:49: warning: inline function ‘_Z23cutGetMaxGflopsDeviceIdv’ declared weak [-Wattributes]
  ../../common/inc/cutil_inline_runtime.h:41:43: warning: inline function ‘_Z23cutGetMaxGflopsDeviceIdv’ declared weak [-Wattributes]
  In file included from /tmp/tmpxft_00004089_00000000-1_matrixMul.cudafe1.stub.c:4:0,
                   from matrixMul.cu:196:
  /usr/include/time.h:183:34: error: conflicting types for ‘__cuda_clock’
  /usr/local/cuda//bin/../include/common_functions.h:70:16: note: previous definition of ‘__cuda_clock’ was here
  In file included from /tmp/tmpxft_00004089_00000000-1_matrixMul.cudafe1.stub.c:4:0,
                   from matrixMul.cu:196:
  /usr/include/x86_64-linux-gnu/bits/mathcalls.h:193:30: error: static declaration of ‘__cuda_error_not_implememted’ follows non-static declaration
  /usr/local/cuda//bin/../include/math_functions.h:864:78: note: previous declaration of ‘__cuda_error_not_implememted’ was here
  In file included from /tmp/tmpxft_00004089_00000000-1_matrixMul.cudafe1.stub.c:5:0,
                   from matrixMul.cu:196:
  /usr/local/cuda//bin/../include/crt/host_runtime.h:185:13: error: redefinition of ‘__cudaUnregisterBinaryUtil’
  /usr/local/cuda//bin/../include/crt/host_runtime.h:185:13: note: previous definition of ‘__cudaUnregisterBinaryUtil’ was here
  make: *** [obj/emurelease/matrixMul.cu.o] Error 255
  </code></pre>
  
  <p>Thanks!</p>