Honor SOURCE_DATE_EPOCH when exporting configuraton date.
Remove unreproducible configuration data.

--- a/configure
+++ b/configure
@@ -23169,7 +23169,14 @@
 
 
 ## Configuration date
- CONFIG_DATE="`date`"
+ CONFIG_DATE="`date -u`"
+if test -n "$SOURCE_DATE_EPOCH"; then
+  CONFIG_DATE=`date -u -d "@$SOURCE_DATE_EPOCH" 2>/dev/null \
+               || date -u -r "$SOURCE_DATE_EPOCH" 2>/dev/null`
+  if test -z "$CONFIG_DATE"; then
+    as_fn_error $? "malformed SOURCE_DATE_EPOCH" "$LINENO" 5
+  fi
+fi
 
 ## User doing the configuration
  CONFIG_USER="`whoami`@`hostname`"

--- a/libhdf4.settings.in
+++ b/libhdf4.settings.in
@@ -5,17 +5,17 @@
 -------------------
 		   HDF4 Version: @H4_VERSION@
 		  Configured on: @CONFIG_DATE@
-		  Configured by: @CONFIG_USER@
+		  Configured by: guix
 		 Configure mode: @CONFIG_MODE@
-		    Host system: @host_cpu@-@host_vendor@-@host_os@
-              Uname information: @UNAME_INFO@
+		    Host system: guix
+              Uname information: guix
 		      Libraries: @STATIC_SHARED@
 	     Installation point: @prefix@
 
 Compiling Options:
 ------------------
                Compilation Mode: @CONFIG_MODE@
-                     C compiler: @CC_VERSION@
+                     C compiler: 
                          CFLAGS: @CFLAGS@
                        CPPFLAGS: @CPPFLAGS@
                Shared Libraries: @enable_shared@
@@ -29,7 +29,7 @@
 Languages:
 ----------
                         Fortran: @BUILD_FORTRAN@
-@HDF_BUILD_FORTRAN_TRUE@               Fortran Compiler: @F77_VERSION@
+@HDF_BUILD_FORTRAN_TRUE@               Fortran Compiler: 
 @HDF_BUILD_FORTRAN_TRUE@                         FFLAGS: @FFLAGS@
 
 Features: