diff --git a/configure.ac b/configure.ac
index 21f40f6c..647b5e30 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,7 @@ AC_PROG_RANLIB
 AC_CHECK_HEADERS(stdint.h)
 AC_CHECK_HEADERS(malloc/malloc.h)
 AC_CHECK_HEADERS(malloc.h)
+AC_CHECK_HEADERS(endian.h)
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_TYPE_SIZE_T
@@ -25,8 +26,6 @@ AC_TYPE_UINT64_T
 
 # Checks for library functions.
 AC_CHECK_FUNCS([gettimeofday])
-AC_CHECK_FUNCS([ntohll])
-AC_CHECK_FUNCS([be64toh])
 
 AC_ARG_ENABLE([simd],[AC_HELP_STRING([--enable-simd=SSE|AVX|AVX2|AVX512],[Select instructions])],[ac_SIMD=${enable_simd}],[ac_SIMD=AVX2])
 
diff --git a/lib/parallelIO/GridNerscIO.h b/lib/parallelIO/GridNerscIO.h
index 51820357..5d1e2e41 100644
--- a/lib/parallelIO/GridNerscIO.h
+++ b/lib/parallelIO/GridNerscIO.h
@@ -6,7 +6,13 @@
 #include <iomanip>
 #include <fstream>
 
+#ifdef HAVE_ENDIAN_H
+#include <endian.h>
 #include <arpa/inet.h>
+#define ntohll be64toh
+#else 
+#include <arpa/inet.h>
+#endif
 
 namespace Grid {
 
@@ -177,14 +183,14 @@ inline void reconstruct3(LorentzColourMatrix & cm)
 }
 
 
- void inline be32toh(void *file_object,uint32_t bytes)
+ void inline be32toh_v(void *file_object,uint32_t bytes)
  {
    uint32_t * f = (uint32_t *)file_object;
    for(int i=0;i*sizeof(uint32_t)<bytes;i++){  
      f[i] = ntohl(f[i]);
    }
  }
- void inline le32toh(void *file_object,uint32_t bytes)
+ void inline le32toh_v(void *file_object,uint32_t bytes)
  {
    uint32_t *fp = (uint32_t *)file_object;
 
@@ -197,14 +203,14 @@ inline void reconstruct3(LorentzColourMatrix & cm)
      fp[i] = ntohl(f);
    }
  }
- void inline be64toh(void *file_object,uint32_t bytes)
+ void inline be64toh_v(void *file_object,uint32_t bytes)
  {
    uint64_t * f = (uint64_t *)file_object;
    for(int i=0;i*sizeof(uint64_t)<bytes;i++){  
      f[i] = ntohll(f[i]);
    }
  }
- void inline le64toh(void *file_object,uint32_t bytes)
+ void inline le64toh_v(void *file_object,uint32_t bytes)
  {
    uint64_t *fp = (uint64_t *)file_object;
    uint64_t f,g;
@@ -387,10 +393,10 @@ inline void readNerscObject(Lattice<vobj> &Umu,std::string file,munger munge,int
       if ( grid->IsBoss() ) {
 	fin.read((char *)&file_object,sizeof(file_object));
 
-	if(ieee32big) be32toh((void *)&file_object,sizeof(file_object));
-	if(ieee32)    le32toh((void *)&file_object,sizeof(file_object));
-	if(ieee64big) be64toh((void *)&file_object,sizeof(file_object));
-	if(ieee64)    le64toh((void *)&file_object,sizeof(file_object));
+	if(ieee32big) be32toh_v((void *)&file_object,sizeof(file_object));
+	if(ieee32)    le32toh_v((void *)&file_object,sizeof(file_object));
+	if(ieee64big) be64toh_v((void *)&file_object,sizeof(file_object));
+	if(ieee64)    le64toh_v((void *)&file_object,sizeof(file_object));
 
 	munge(file_object,munged,csum);
       }