diff -ruN Alien-HDF4-0.05.orig/common.pl Alien-HDF4-0.05/common.pl
--- Alien-HDF4-0.05.orig/common.pl	2019-04-27 03:01:25.000000000 +0200
+++ Alien-HDF4-0.05/common.pl	2021-07-29 00:47:09.923447920 +0200
@@ -36,13 +36,13 @@
     foreach my $libdir ( @HDF_lib_locations ) {
         return (
             $libdir, '-lmfhdfalt -ldfalt',
-        ) if -e "$libdir/libdfalt.a";
+        ) if -e "$libdir/libdfalt.$Config{so}";
         return (
             $libdir, '-lmfhdf -ldf',
-        ) if -e "$libdir/libdf.a";
+        ) if -e "$libdir/libdf.$Config{so}";
         return (
             $libdir, '-lmfhdf -lhdf -lxdr',
-        ) if -e "$libdir/libhdf.a";
+        ) if -e "$libdir/libhdf.$Config{so}";
     }
     return;
 }
diff -ruN Alien-HDF4-0.05.orig/Makefile.PL Alien-HDF4-0.05/Makefile.PL
--- Alien-HDF4-0.05.orig/Makefile.PL	2019-04-27 02:53:52.000000000 +0200
+++ Alien-HDF4-0.05/Makefile.PL	2021-07-29 00:46:34.395073467 +0200
@@ -7,7 +7,7 @@
 
 my ($libpath, $libs) = findlibs();
 die <<EOF unless defined $libpath;
-Cannot find hdf library, libdf.a.
+Cannot find hdf library, libdf.$Config{so}.
 Please add the correct library path to Makefile.PL or install HDF
 EOF