some quick fix

src/utils/omp.h

@@ -10,7 +10,7 @@
 #else
 #ifndef DISABLE_OPENMP
 // use pragma message instead of warning
-#pragma message ("Warning: OpenMP is not available, xgboost will be compiled into single thread code. You may want to ungrade your compiler to enable OpenMP support, to get benefit of multi-threading.")
+#pragma message ("Warning: OpenMP is not available. XGBoost will be compiled with single thread mode. You may want to use compiler with OpenMP support to get benefit of multi-threading.")
 #endif
 inline int omp_get_thread_num() { return 0; }
 inline int omp_get_num_threads() { return 1; }

src/utils/utils.h

@@ -23,12 +23,11 @@
 #endif
 #endif
 
-#ifdef __APPLE__
+#ifdef __APPLE__ 
 #define off64_t off_t
 #define fopen64 fopen
 #endif
 
-#define _FILE_OFFSET_BITS 64
 extern "C" {
 #include <sys/types.h>
 }