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='2019-01-08 18:19:15 +0200'>2019-01-08</span></td><td><a href='/guix/commit/gnu/packages/readline.scm?id=2cb4f940f2a18d68b14b0bb7a8ddaf766d8024ab'>gnu: readline: Update to 8.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/readline.scm (readline): Update to 8.0.
[source]: Remove patch series %patch-series-7.0.
(readline-7): New variable.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-07-21 02:13:45 +0200'>2018-07-21</span></td><td><a href='/guix/commit/gnu/packages/readline.scm?id=463ad503b1a0e107e2b6b8317745acc13f49ad2f'>gnu: readline: Update to 7.0.5.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/readline.scm (%patch-series-7.0): Add patch 4 and 5.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-01-19 23:59:20 -0500'>2018-01-19</span></td><td><a href='/guix/commit/gnu/packages/readline.scm?id=e074a655dd6497daafbd62737e3b63f3d5aa7985'>Merge branch 'master' into core-updates</a></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-01-18 04:26:41 +0100'>2018-01-18</span></td><td><a href='/guix/commit/gnu/packages/readline.scm?id=f1fac6b8e0a06bd96e54b96ab050ea6c91d08657'>gnu: rlwrap: Update to 0.43.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/readline.scm (rlwrap): Update to 0.43.
[source, home-page]: Use new upstream URI.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-12-03 17:47:18 +0100'>2017-12-03</span></td><td><a href='/guix/commit/gnu/packages/readline.scm?id=a850cbdd43a5447733f902fc26452a528038545d'>gnu: readline: Remove obsolete post-install phase.</a><span class='msg-avail'>...<span class='msg-tooltip'>The 'strip' phase does this unconditionally now.

* gnu/packages/readline.scm (readline)[arguments]&lt;#:phases&gt;: Remove.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-12-03 15:04:46 +0100'>2017-12-03</span></td><td><a href='/guix/commit/gnu/packages/readline.scm?id=371193ecbfa3e4e41a7f0e380f7f15c485806e73'>gnu: readline: Update to 7.0.3.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/readline.scm (patch-url, readline-patch): New procedures.
(patch-series): New macro.
(%patch-series-7.0): New variable.
(readline)[version]: Include patchlevel.
[source](uri): Adjust to version suffix.
[source](patches): Add %PATCH-SERIES-7.0.
</span></span></td><td>Marius Bakke</td></tr>