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=b67013c8ca28c5f5b5c5e1eeb869870c2c1dabe9'>root</a>/<a href='/guix/log/tests?id=b67013c8ca28c5f5b5c5e1eeb869870c2c1dabe9'>tests</a>/<a href='/guix/log/tests/guix-download.sh?id=b67013c8ca28c5f5b5c5e1eeb869870c2c1dabe9'>guix-download.sh</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/tests/guix-download.sh?id=b67013c8ca28c5f5b5c5e1eeb869870c2c1dabe9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-09-28 21:06:36 -0500'>2020-09-28</span></td><td><a href='/guix/commit/tests/guix-download.sh?id=d8934360d2453a403b5433e71d09188e4ed23b57'>tests: Simplify shell exit status negation;</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/guix-archive.sh, tests/guix-build-branch.sh, tests/guix-build.sh,
tests/guix-daemon.sh, tests/guix-download.sh, tests/guix-environment.sh,
tests/guix-gc.sh, tests/guix-git-authenticate.sh, tests/guix-graph.sh,
tests/guix-hash.sh, tests/guix-lint.sh, tests/guix-pack-relocatable.sh,
tests/guix-pack.sh, tests/guix-package-aliases.sh, tests/guix-package-net.sh,
tests/guix-package.sh: Use the shell '!' keyword to negate command exit status
in place of 'if ...; then false; else true; fi'
</span></span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2017-08-20 20:55:45 +0800'>2017-08-20</span></td><td><a href='/guix/commit/tests/guix-download.sh?id=a02967d77af03d6468e25d6e26dbea0db919ce96'>guix download: Support retrieving local file without the URI scheme.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/download.scm (guix-download): Treat the URL argument as a local
file path when it fails on 'string-&gt;uri'.  Call 'fetch' with the processed
'uri' instead of the original URL argument.
* tests/guix-download.sh: Adjust accordingly.
</span></span></td><td>宋文武</td></tr>
<tr><td><span title='2016-11-16 18:00:41 +0100'>2016-11-16</span></td><td><a href='/guix/commit/tests/guix-download.sh?id=1bcc87bb685b7985512add221f10e4cb58b5f6f7'>guix download: Add '-o' option.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/download.scm (download-to-file, download-to-store*): New
procedures.
(%default-options): Add 'download-proc'.
(show-help): Adjust description and document '-o'.
(%options): Add '-o'.
(guix-download): Remove 'store' variable.  Add 'fetch' and define 'path'
to as its result.
* tests/guix-download.sh: Add test.
</span></span></td><td>Ludovic Courtès</td></tr>