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='2018-08-16 05:32:47 +0200'>2018-08-16</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=666da84f0f54d3e2f1ab6b6c14ebd9899a47dd50'>gnu: erlang: Update to 21.0.5.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-08-16 05:21:38 +0200'>2018-08-16</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=70f57ae00525f6fc919f62aea647a33b29d28537'>gnu: Use ©.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-08-16 05:15:21 +0200'>2018-08-16</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=ed672882626d30d3e0deba6d9265ac4d321113f2'>gnu: erlang: Don't use unstable tarball.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-07-17 15:13:48 +0200'>2018-07-17</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=39eec9881d965060039a2b6bfbf545f06253161c'>gnu: erlang: Update to 21.0.</a><span class='msg-avail'>...</span></td><td>Nils Gillmann</td></tr>
<tr><td><span title='2018-06-12 07:44:05 +0100'>2018-06-12</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=b5453aa7c314bec95e0c25b904f3517d338577ed'>gnu: erlang: Patch occurrences of /bin/sh in the source.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2018-06-12 07:43:59 +0100'>2018-06-12</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=9b25e1d1248da83fa3f39f8fe163b842ec4c4d5a'>gnu: erlang: Delete the bootstrap phase.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2018-02-19 05:57:17 +0100'>2018-02-19</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=eae7ece1afee77fef8d3cdd3b65a208ead971fac'>gnu: erlang: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-16 11:11:41 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=1b0ce451f4ba492e72b7e1ee85534955664a6559'>gnu: erlang: Update phase style.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-16 11:11:41 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=629c1947ea2b007d7103612dc0d25237abb2b555'>gnu: erlang: Update to 20.2.3.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-12-13 19:51:00 -0500'>2017-12-13</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=35e86e3605fdfa9920749b2b791f799770722b14'>gnu: Erlang: Update to 20.1.7 [fixes CVE-2017-1000385].</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-12-04 10:36:48 +0100'>2017-12-04</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=8cbb58918c4e5fe236a1cf34ff46477f4932fb01'>gnu: erlang: Update to 20.1.</a><span class='msg-avail'>...</span></td><td>nee</td></tr>
<tr><td><span title='2017-10-20 22:55:51 +0200'>2017-10-20</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=fd75eb6cd4e5c689f9e6ce7dd8d87f423778d308'>gnu: Fix the hashes of mutated GitHub archives.</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2017-09-04 00:10:59 -0400'>2017-09-04</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=d10092b849153dc27cfed0a9601fde6c7bdec918'>gnu: Put autoconf-related phases immediately after the 'unpack phase.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-07-31 17:02:36 +0200'>2017-07-31</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=ee217402f7bf4b9fd49250650cf94d882a5e1a23'>gnu: erlang: Update to 20.0.</a><span class='msg-avail'>...</span></td><td>Peter Mikkelsen</td></tr>
<tr><td><span title='2017-07-29 23:03:47 +0200'>2017-07-29</span></td><td><a href='/guix/commit/gnu/packages/erlang.scm?id=a4078acf4ab7d694e86ffcaef2073d71e58508f1'>gnu: erlang: Fix man-pages search path of 'erl -man'.</a><span class='msg-avail'>...</span></td><td>Peter Mikkelsen</td></tr>