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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<tr><td><span title='2020-03-13 22:57:04 +0100'>2020-03-13</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=788425c2a8df0545fd31cb8ed4578ecb635739c3'>gnu: taglib: Use HTTPS home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (taglib)[home-page]: Use HTTPS.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-01-03 13:54:12 +0100'>2020-01-03</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=a96c00865aeba1c05b56822e6a0601dd81e85c67'>gnu: eyed3: Update to 0.8.12.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (eyed3): Update to 0.8.12.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-12-28 12:44:15 +0100'>2019-12-28</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=2577d9341adb7e3533818cdff12b2080f4e622d2'>gnu: Add python-pyacoustid.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (python-pyacoustid): New variable.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-12-28 12:44:15 +0100'>2019-12-28</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=8ce704b2b12bb7ecd8b12d7b091dc0f816591b8f'>gnu: Add python-audioread.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (python-audioread): New variable.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-11-11 04:50:29 +0100'>2019-11-11</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=1cb82fa4120d9e924305aced876f794ad3132fd9'>gnu: eyed3: Update to 0.8.11.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (eyed3): Update to 0.8.11.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-27 15:20:12 +0100'>2019-10-27</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=eb28d9cf8d04e0df9d8025f91d836bba7a05eb82'>gnu: mpg123: Update to 1.25.13.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (mpg123): Update to 1.25.13.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-10-13 13:07:44 +0200'>2019-10-13</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=b5f6700fb454edad46e84cc46edb3654e42b5172'>gnu: id3lib: Apply patch for UTF16 writing bug.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/id3lib-UTF16-writing-bug.patch: New file.
* gnu/packages/mp3.scm (id3lib)[source](patches): Add it.
* gnu/local.mk (dist_patch_DATA): Add it.

Signed-off-by: Danny Milosavljevic &lt;dannym@scratchpost.org&gt;
</span></span></td><td>Pierre Langlois</td></tr>
<tr><td><span title='2019-08-30 23:10:20 +0200'>2019-08-30</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=7ef15fa378d0cc5d14a244f6f53ffe44c682f7c8'>gnu: mpg123: Update to 1.25.12.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/mp3.scm (mpg123): Update to 1.25.12.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-08-06 03:18:24 -0400'>2019-08-06</span></td><td><a href='/guix/commit/gnu/packages/mp3.scm?id=aac6c53a7bc9a8d22e88a490ebc99ec79d64a05b'>gnu: libmad: Add more security fixes from Debian.</a><span class='msg-avail'>...<span class='msg-tooltip'>Includes fixes for CVE-2017-8372, CVE-2017-8373, and CVE-2017-8374.

Reported by &lt;marit@secmail.pro&gt; in &lt;https://bugs.gnu.org/36909&gt;.

* gnu/packages/patches/libmad-frame-length.patch: Delete file.
* gnu/packages/patches/libmad-length-check.patch,
gnu/packages/patches/libmad-md_size.patch: New files.
* gnu/local.mk (dist_patch_DATA): Update accordingly.
* gnu/packages/mp3.scm (libmad)[source]: Update patches accordingly.
</span></span></td><td>Mark H Weaver</td></tr>