Changes necessary for shared library linking to succeed.

diff --git a/src/Makefile.in b/src/Makefile.in
index 9534473..12411bf 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -73,7 +73,7 @@ LTCOMPILE = $(LIBTOOL) --mode=compile --tag=CC $(CC) $(DEFS) \
 	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
 	$(AM_CFLAGS) $(CFLAGS)
 CCLD = $(CC)
-LINK = $(LIBTOOL) --mode=link --tag=CC $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+LINK = HDF4_USE_SHLIB=yes $(LIBTOOL) --mode=link --tag=CC $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
 	$(AM_LDFLAGS) $(LDFLAGS) -o $@
 SOURCES = $(libhdfeos_la_SOURCES)
 DIST_SOURCES = $(libhdfeos_la_SOURCES)
@@ -125,8 +125,6 @@ INSTALL_PROGRAM = @INSTALL_PROGRAM@
 INSTALL_SCRIPT = @INSTALL_SCRIPT@
 INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
 
-# Set LDFLAGS to alow the HDF-EOS library to use extern variables from HDF4
-LDFLAGS = -Wl,-single_module
 LIBOBJS = @LIBOBJS@
 LIBS = @LIBS@
 LIBTOOL = @LIBTOOL@

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<div class='path'>path: <a href='/guix/log/?id=f3d3726e44cc0dc1678bdb97cffe3b9c6ad8f513'>root</a>/<a href='/guix/log/build-aux?id=f3d3726e44cc0dc1678bdb97cffe3b9c6ad8f513'>build-aux</a>/<a href='/guix/log/build-aux/cuirass?id=f3d3726e44cc0dc1678bdb97cffe3b9c6ad8f513'>cuirass</a>/<a href='/guix/log/build-aux/cuirass/gnu-system.scm?id=f3d3726e44cc0dc1678bdb97cffe3b9c6ad8f513'>gnu-system.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/cuirass/gnu-system.scm?id=f3d3726e44cc0dc1678bdb97cffe3b9c6ad8f513&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-04-08 17:48:33 +0200'>2018-04-08</span></td><td><a href='/guix/commit/build-aux/cuirass/gnu-system.scm?id=a1ec7540be9b30593f5e83e36a0e83b1bcf337f1'>cuirass: Factorize hydra-to-cuirass CI job translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/cuirass/gnu-system.scm: Move code to...
* build-aux/cuirass/hydra-to-cuirass.scm: ... here, and include it.
* Makefile.am (EXTRA_DIST): Add 'build-aux/cuirass/hydra-to-cuirass.scm'
and 'build-aux/cuirass/gnu-system.scm'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-15 15:18:03 +0100'>2018-01-15</span></td><td><a href='/guix/commit/build-aux/cuirass/gnu-system.scm?id=403f2dccfcf992573ceeeae7c76c71b4884d3cd4'>cuirass: Properly convert list of &lt;license&gt; objects.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes a bug whereby we would 'write' raw &lt;license&gt; objects when they
were in a list.

* build-aux/cuirass/gnu-system.scm (entry-&gt;sexp-entry): Add recursive
case when O is a list.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-27 22:19:28 +0200'>2017-09-27</span></td><td><a href='/guix/commit/build-aux/cuirass/gnu-system.scm?id=66bc1d2aaf74fc7eb4ef9b3519c69bd37142ffb3'>cuirass: Add gnu-system build spec.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/hydra/gnu-system.scm (hydra-jobs): Support subset "hello".
* build-aux/cuirass/gnu-system.scm: New file.
* doc/guix.texi (Continuous Integration): Update example spec.
</span></span></td><td>Jan Nieuwenhuizen</td></tr>