diff --git a/hdf-4.2r1-ppc.patch b/hdf-4.2r1-ppc.patch
new file mode 100644
index 0000000..b66d83a
--- /dev/null
+++ b/hdf-4.2r1-ppc.patch
@@ -0,0 +1,68 @@
+--- HDF4.2r1/hdf/src/hdfi.h.orig	2005-01-24 20:36:44.000000000 -0700
++++ HDF4.2r1/hdf/src/hdfi.h	2006-02-02 21:54:59.347516688 -0700
+@@ -72,6 +72,7 @@
+ #define     DFMT_CRAYMPP        0x1171
+ #define     DFMT_IA64           0x4441
+ #define     DFMT_LINUX64        0x4441
++#define     DFMT_LINUXPPC       0x1111
+ 
+ /* I/O library constants */
+ #define UNIXUNBUFIO 1
+@@ -1326,6 +1327,57 @@
+ 
+ #endif /*Linux 64 */
+ 
++/* Linux PPC */
++#if defined __PPC__
++
++#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_LINUXPPC
++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;
++typedef int               int32;
++typedef unsigned int      uint32;
++typedef int               intn;
++typedef unsigned int      uintn;
++typedef int               intf;     /* size of INTEGERs in Fortran compiler */
++typedef float             float32;
++typedef double            float64;
++typedef long              hdf_pint_t;   /* an integer the same size as a pointer */
++#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 PPC */
++
+ /*#ifndef GOT_MACHINE
+ No machine type has been defined.  Your Makefile needs to have someing like
+ -DSUN or -DUNICOS in order for the HDF internal structures to be defined
diff --git a/hdf.spec b/hdf.spec
index db7213c..bca4b58 100644
--- a/hdf.spec
+++ b/hdf.spec
@@ -1,6 +1,6 @@
 Name: hdf
 Version: 4.2r1
-Release: 6%{?dist}
+Release: 7%{?dist}
 Summary: A general purpose library and file format for storing scientific data
 License: BSD-ish
 Group: System Environment/Libraries
@@ -8,10 +8,10 @@ URL: http://hdf.ncsa.uiuc.edu/hdf4.html
 Source0: ftp://ftp.ncsa.uiuc.edu/HDF/HDF/HDF_Current/src/HDF%{version}.tar.gz
 Source1: ftp://ftp.ncsa.uiuc.edu/HDF/HDF/HDF_Current/src/patches/4.2r1-hrepack-patch.tar
 Patch0: hdf-4.2r1-configure.patch
+Patch1: hdf-4.2r1-ppc.patch
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: autoconf flex byacc libjpeg-devel zlib-devel
 BuildRequires: gcc-gfortran
-ExcludeArch: ppc ppc64
 
 %description
 HDF is a general purpose library and file format for storing scientific data.
@@ -37,6 +37,7 @@ tar xf %{SOURCE1} --directory mfhdf/hrepack
 mv mfhdf/hrepack/4.2r1-hrepack-patch/*.[ch] mfhdf/hrepack
 rm -r mfhdf/hrepack/4.2r1-hrepack-patch
 %patch0 -p1 -b .orig
+%patch1 -p1 -b .orig
 
 %build
 autoconf
@@ -73,6 +74,9 @@ rm -rf $RPM_BUILD_ROOT
 %{_libdir}/%{name}/
 
 %changelog
+* Thu Feb  2 2006 Orion Poplawski <orion@cora.nwra.com> 4.2r1-7
+- Add patch to build on ppc
+
 * Wed Dec 21 2005 Orion Poplawski <orion@cora.nwra.com> 4.2r1-6
 - Rebuild