diff -Naurp bigdft-abi-1.0.4-orig/S_GPU/src/class_utils.h bigdft-abi-1.0.4/S_GPU/src/class_utils.h
--- bigdft-abi-1.0.4-orig/S_GPU/src/class_utils.h	2012-07-09 14:43:33.000000000 +0000
+++ bigdft-abi-1.0.4/S_GPU/src/class_utils.h	2013-06-27 09:52:17.000000000 +0000
@@ -32,6 +32,7 @@
 #include <config.h>
 #endif
 
+#include <unistd.h>
 #include <sstream>
 
 class deleter
diff -Naurp bigdft-abi-1.0.4-orig/src/CUDA/check_cuda.h bigdft-abi-1.0.4/src/CUDA/check_cuda.h
--- bigdft-abi-1.0.4-orig/src/CUDA/check_cuda.h	2012-07-09 14:43:33.000000000 +0000
+++ bigdft-abi-1.0.4/src/CUDA/check_cuda.h	2013-06-27 09:51:50.000000000 +0000
@@ -1,6 +1,7 @@
 #ifndef __checkcuda__
 #define __checkcuda__
 
+#include <unistd.h>
 #include <string>
 #include <sstream>