--- hdf/config/powerpc-apple.orig	Sat Nov  5 12:22:05 2005
+++ hdf/config/powerpc-apple	Sat Nov  5 12:22:11 2005
@@ -26,8 +26,8 @@
 fi
 #Make IBM xlf compiler a deafult
 if test "X-$F77" = "X-"; then
-  F77=xlf
-  F77_BASENAME=xlf
+  F77=g77
+  F77_BASENAME=g77
 
 else
     case $F77 in
@@ -141,6 +141,13 @@
 esac
 
 case $F77_BASENAME in 
+  g77)
+    FFLAGS="$FFLAGS -Wsign-compare"
+    DEBUG_FFLAGS="-g"
+    PROD_FFLAGS="-O3 -fomit-frame-pointer"
+    PROFILE_FFLAGS="-pg"
+    ;;
+
   xlf)
     FFLAGS="$FFLAGS"
     DEBUG_FFLAGS="-g"
--- hdf/hdf/src/hdfi.h.orig	2006-01-02 20:07:53.000000000 -0700
+++ hdf/hdf/src/hdfi.h	2006-01-02 20:08:51.000000000 -0700
@@ -754,8 +754,8 @@
 typedef double          float64;
 typedef int             intf;     /* size of INTEGERs in Fortran compiler */
 typedef int               hdf_pint_t;   /* an integer the same size as a pointer */
+#define FNAME_POST_UNDERSCORE
 #define _fcdtocp(desc) (desc)
-#define FNAME(x) x
 #ifdef H4_ABSOFT
 #define DF_CAPFNAMES
 #endif /*ABSOFT*/