diff -up hdf-4.2.15/hdf/src/hdfi.h.s390 hdf-4.2.15/hdf/src/hdfi.h
--- hdf-4.2.15/hdf/src/hdfi.h.s390	2020-04-30 21:07:16.946922845 -0600
+++ hdf-4.2.15/hdf/src/hdfi.h	2020-04-30 21:07:16.950922901 -0600
@@ -77,6 +77,7 @@
 #define     DFMT_POWERPC64      0x1111
 #define     DFMT_LINUXPPC       0x1111
 #define     DFMT_LINUXSPARC     0x1111
+#define     DFMT_LINUX390       0x1111
 
 /* I/O library constants */
 #define UNIXUNBUFIO 1
@@ -1130,6 +1131,66 @@ typedef int               hdf_pint_t;
 
 #endif /* Linux Sparc32/64 */
 
+/* Linux s390/s390x */
+#if defined __s390__ || defined __s390x__
+
+#ifdef GOT_MACHINE
+If you get an error on this line more than one machine type has been defined.
+Please check your Makefile.
+#endif
+#define GOT_MACHINE
+
+#include <sys/file.h>               /* for unbuffered i/o stuff */
+#include <sys/stat.h>
+#define DF_MT             DFMT_LINUX390
+typedef void              VOID;
+typedef void              *VOIDP;
+typedef char              *_fcd;
+typedef char              char8;
+typedef unsigned char     uchar8;
+typedef char              int8;
+typedef unsigned char     uint8;
+typedef short int         int16;
+typedef unsigned short int uint16;
+#ifdef __s390x__ /* 64-bit environment */
+typedef int               int32;
+typedef unsigned int      uint32;
+#else /* 32-bit environment */
+typedef long int          int32;
+typedef unsigned long int uint32;
+#endif
+typedef int               intn;
+typedef unsigned int      uintn;
+typedef int               intf;     /* size of INTEGERs in Fortran compiler */
+typedef float             float32;
+typedef double            float64;
+#ifdef __s390x__ /* 64-bit environment */
+typedef long              hdf_pint_t;   /* an integer the same size as a pointer */
+#else /* 32-bit environment */
+typedef int               hdf_pint_t;   /* an integer the same size as a pointer */
+#endif
+#define FNAME_POST_UNDERSCORE
+#define _fcdtocp(desc) (desc)
+#ifdef  HAVE_FMPOOL
+#define FILELIB PAGEBUFIO  /* enable page buffering */
+#else
+#define FILELIB UNIXBUFIO
+#endif
+
+/* JPEG #define's - Look in the JPEG docs before changing - (Q) */
+
+/* Determine the memory manager we are going to use. Valid values are: */
+/*  MEM_DOS, MEM_ANSI, MEM_NAME, MEM_NOBS.  See the JPEG docs for details on */
+/*  what each does */
+#define JMEMSYS         MEM_ANSI
+
+#ifdef __GNUC__
+#define HAVE_STDC
+#define INCLUDES_ARE_ANSI
+#endif
+
+#endif /* Linux s390/s390x */
+
 /*-----------------------------------------------------*/
 /* 64-bit Free BSD */
 
diff -up hdf-4.2.15/mfhdf/fortran/jackets.c.in.s390 hdf-4.2.15/mfhdf/fortran/jackets.c.in
--- hdf-4.2.15/mfhdf/fortran/jackets.c.in.s390	2020-04-30 21:07:16.942922790 -0600
+++ hdf-4.2.15/mfhdf/fortran/jackets.c.in	2020-04-30 21:10:30.030640644 -0600
@@ -34,7 +34,7 @@
 
 struct ncfils {            /* This will be a common block from Fortran */
     double dd;
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
     int ll;
 #else
     long ll;
@@ -65,7 +65,7 @@ struct ncfils {            /* This will
 
 struct ncfils {            /* This will be a common block from Fortran */
     double dd;
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
     int ll;
 #else
     long ll;
@@ -420,7 +420,7 @@ stoig(shorts, ints, dims, basis, ndims)
 }
 #endif /* FORTRAN_HAS_NO_SHORT */
 
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 /*
  * Convert multi-dimensional array of NCLONGs stored in ints to packed
  * array of longs, in malloc'ed space.  Returns pointer to longs or NULL
@@ -908,7 +908,7 @@ nncvpt1(cdfid, varid, indices, value, rc
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long          longs = *(int *)value;
@@ -1022,7 +1022,7 @@ nncvpt(cdfid, varid, start, count, value
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long *longs = itol (value, ncount, ndims);
@@ -1133,7 +1133,7 @@ nncvptg(cdfid, varid, start, count, stri
     tmpbasis    = nctypelen(NC_LONG);
     else
 #endif
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
     if (datatype == NC_LONG)
     tmpbasis    = sizeof(int);
     else
@@ -1190,7 +1190,7 @@ nncvptg(cdfid, varid, start, count, stri
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long *longs = itolg (value, ncount, nbasis, ndims);
@@ -1326,7 +1326,7 @@ nncvgt1(cdfid, varid, indices, value, rc
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long          longs;
@@ -1468,7 +1468,7 @@ nncvgt(cdfid, varid, start, count, value
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long iocount = dimprod (ncount, ndims);    /* product of dimensions */
@@ -1606,7 +1606,7 @@ nncvgtg(cdfid, varid, start, count, stri
     tmpbasis    = nctypelen(NC_LONG);
     else
 #endif
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
     if (datatype == NC_LONG)
     tmpbasis    = sizeof(int);
     else
@@ -1677,7 +1677,7 @@ nncvgtg(cdfid, varid, start, count, stri
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long iocount = dimprod (ncount, ndims);    /* product of dimensions */
@@ -1843,7 +1843,7 @@ nncapt(cdfid, varid, attname, datatype,
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) *datatype == NC_LONG && handle->file_type!=HDF_FILE) {
     long *longs = itol (value, attlen, 1);
@@ -2008,7 +2008,7 @@ nncagt(cdfid, varid, attname, value, rco
     return;
     }                /* else */
 #endif                /* FORTRAN_HAS_NO_SHORT */
-#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if  defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 #ifdef HDF
     if ((nc_type) datatype == NC_LONG && handle->file_type!=HDF_FILE) {
 /* EIP  We need to use int buffer to read data in on the platforms where long is 8 bytes
diff -up hdf-4.2.15/mfhdf/libsrc/array.c.s390 hdf-4.2.15/mfhdf/libsrc/array.c
diff -up hdf-4.2.15/mfhdf/libsrc/cdf.c.s390 hdf-4.2.15/mfhdf/libsrc/cdf.c
diff -up hdf-4.2.15/mfhdf/libsrc/netcdf.h.in.s390 hdf-4.2.15/mfhdf/libsrc/netcdf.h.in
--- hdf-4.2.15/mfhdf/libsrc/netcdf.h.in.s390	2020-04-30 21:07:16.957922998 -0600
+++ hdf-4.2.15/mfhdf/libsrc/netcdf.h.in	2020-04-30 21:15:23.731467288 -0600
@@ -293,7 +293,7 @@ typedef double        ncdouble;
 /*
  * Variables/attributes of type NC_LONG should use the C type 'nclong'
  */
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 /*
  * LP64 (also known as 4/8/8) denotes long and pointer as 64 bit types.
  * http://www.unix.org/version2/whatsnew/lp64_wp.html
diff -up hdf-4.2.15/mfhdf/libsrc/putget.c.s390 hdf-4.2.15/mfhdf/libsrc/putget.c
--- hdf-4.2.15/mfhdf/libsrc/putget.c.s390	2020-04-30 21:07:16.959923025 -0600
+++ hdf-4.2.15/mfhdf/libsrc/putget.c	2020-04-30 21:12:13.612268179 -0600
@@ -665,7 +665,7 @@ Void *values ;
     case NC_SHORT :
         return( xdr_NCvshort(xdrs, (unsigned)rem/2, (short *)values) ) ;
     case NC_LONG :
-#if (_MIPS_SZLONG == 64) || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ 
+#if (_MIPS_SZLONG == 64) || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
         return( xdr_int(xdrs, (nclong *)values) ) ;
 #else
         return( xdr_long(xdrs, (nclong *)values) ) ;
diff -up hdf-4.2.15/mfhdf/libsrc/xdrposix.c.s390 hdf-4.2.15/mfhdf/libsrc/xdrposix.c
--- hdf-4.2.15/mfhdf/libsrc/xdrposix.c.s390	2020-03-03 10:40:50.000000000 -0700
+++ hdf-4.2.15/mfhdf/libsrc/xdrposix.c	2020-04-30 21:14:47.574557550 -0600
@@ -262,7 +262,7 @@ int nbytes;
 
 static bool_t   xdrposix_getlong();
 static bool_t   xdrposix_putlong();
-#if (_MIPS_SZLONG == 64) || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__
+#if (_MIPS_SZLONG == 64) || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 static bool_t   xdrposix_getint();
 static bool_t   xdrposix_putint();
 #endif
@@ -276,7 +276,7 @@ static long *    xdrposix_inline();
 #if (defined __sun && defined _LP64)
 static rpc_inline_t *    xdrposix_inline();
 #else
-#if ((defined __x86_64__ ) && !(defined __sun && defined _LP64)) || defined __powerpc64__
+#if ((defined __x86_64__ ) && !(defined __sun && defined _LP64)) || defined __powerpc64__ || defined __s390x__
 static int32_t *    xdrposix_inline();
 #else
 static netlong *    xdrposix_inline();
@@ -302,9 +302,9 @@ static struct xdr_ops   xdrposix_ops = {
     xdrposix_getpos,    /* get offset in the stream */
     xdrposix_setpos,    /* set offset in the stream */
     xdrposix_inline,    /* prime stream for inline macros */
-#if (defined __sun && defined _LP64) || defined __x86_64__ || defined __powerpc64__
+#if (defined __sun && defined _LP64) || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
     xdrposix_destroy,   /* destroy stream */
-#if !(defined __x86_64__) && !(defined __powerpc64__) || (defined  __sun && defined _LP64) /* i.e. we are on SUN/Intel in 64-bit mode */
+#if !(defined __x86_64__) && !(defined __powerpc64__) && !(defined __s390x__) || (defined  __sun && defined _LP64) /* i.e. we are on SUN/Intel in 64-bit mode */
     NULL,               /* no xdr_control function defined */
 #endif
     /* Solaris 64-bit (arch=v9 and arch=amd64) has 64 bits long and 32 bits int. */
@@ -442,7 +442,7 @@ xdrposix_getlong(xdrs, lp)
     long *lp;
 {
     unsigned char *up = (unsigned char *)lp ;
-#if (defined AIX5L64 || defined __powerpc64__ || (defined __hpux && __LP64__))
+#if (defined AIX5L64 || defined __powerpc64__ || defined __s390x__ || (defined __hpux && __LP64__))
     *lp = 0 ;
     up += (sizeof(long) - 4) ;
 #endif
@@ -465,7 +465,7 @@ xdrposix_putlong(xdrs, lp)
     netlong mycopy = htonl(*lp);
     up = (unsigned char *)&mycopy;
 #endif
-#if (defined AIX5L64  || defined __powerpc64__ || (defined __hpux && __LP64__))
+#if (defined AIX5L64  || defined __powerpc64__ || defined __s390x__ || (defined __hpux && __LP64__))
     up += (sizeof(long) - 4) ;
 #endif
 
@@ -560,7 +560,7 @@ static long *
 #if (defined __sun && defined _LP64)
 static rpc_inline_t *
 #else
-#if ((defined  __x86_64__) && !(defined __sun && defined _LP64)) || defined __powerpc64__
+#if ((defined  __x86_64__) && !(defined __sun && defined _LP64)) || defined __powerpc64__ || defined __s390x__
 static int32_t *
 #else
 static netlong *
@@ -581,7 +581,7 @@ xdrposix_inline(xdrs, len)
     return (NULL);
 }
 
-#if (_MIPS_SZLONG == 64) || (defined __sun && defined _LP64) || defined AIX5L64  || defined __x86_64__ || defined __powerpc64__
+#if (_MIPS_SZLONG == 64) || (defined __sun && defined _LP64) || defined AIX5L64  || defined __x86_64__ || defined __powerpc64__ || defined __s390x__
 
 static bool_t
 xdrposix_getint(xdrs, lp)
diff -up hdf-4.2.15/mfhdf/ncgen/ncgen.l.s390 hdf-4.2.15/mfhdf/ncgen/ncgen.l
--- hdf-4.2.15/mfhdf/ncgen/ncgen.l.s390	2020-04-30 21:07:16.961923053 -0600
+++ hdf-4.2.15/mfhdf/ncgen/ncgen.l	2020-04-30 21:08:10.175628593 -0600
@@ -113,7 +113,7 @@ FloatInf|Infinity|Inf    {    /* float m
             yyerror(errstr);
         }
 
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || __powerpc64__ || defined __s390x__
         if (dd < INT_MIN  ||  dd > INT_MAX)
 #else
         if (dd < LONG_MIN  ||  dd > LONG_MAX)
diff -up hdf-4.2.15/mfhdf/ncgen/ncgenyy.c.s390 hdf-4.2.15/mfhdf/ncgen/ncgenyy.c
--- hdf-4.2.15/mfhdf/ncgen/ncgenyy.c.s390	2020-04-30 21:07:16.963923081 -0600
+++ hdf-4.2.15/mfhdf/ncgen/ncgenyy.c	2020-04-30 21:08:53.818030313 -0600
@@ -991,7 +991,7 @@ YY_RULE_SETUP
             yyerror(errstr);
         }
 
-#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || __powerpc64__
+#if defined __alpha || (_MIPS_SZLONG == 64) || defined __ia64 || (defined __sun && defined _LP64) || defined AIX5L64 || defined __x86_64__ || __powerpc64__ || __s390x__
         if (dd < INT_MIN  ||  dd > INT_MAX)
 #else
         if (dd < LONG_MIN  ||  dd > LONG_MAX)