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='2022-06-06 13:50:50 -0700'>2022-06-06</span></td><td><a href='/guix/commit/gnu/packages/perl.scm?id=8bac52e6f31c732ddec8747378c2fad643a9e964'>gnu: perl-term-size-perl: Remove timestamps.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl.sc (perl-term-size-perl)[arguments]: Add
  'remote-timestamps phase.
</span></span></td><td>Vagrant Cascadian</td></tr>
<tr><td><span title='2022-06-01 22:44:12 +0200'>2022-06-01</span></td><td><a href='/guix/commit/gnu/packages/perl.scm?id=8ba33143acdbd7df0a1f118332de4df08a1c7b5f'>gnu: Add perl-socket-msghdr</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl.scm (perl-socket-msghdr): New variable.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Thiago Jung Bauermann</td></tr>
<tr><td><span title='2022-03-11 23:34:48 -0500'>2022-03-11</span></td><td><a href='/guix/commit/gnu/packages/perl.scm?id=58d5d83dbb20819d817bdaca1dd098430edaa178'>gnu: perl-unicode-utf8: Run tests conditionally.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl.scm (perl-unicode-utf8)[arguments]&lt;#:tests?&gt;:
  Set to #false when cross-compiling.

Signed-off-by: Maxim Cournoyer &lt;maxim.cournoyer@gmail.com&gt;
</span></span></td><td>Maxime Devos</td></tr>
<tr><td><span title='2022-02-07 14:02:15 +0100'>2022-02-07</span></td><td><a href='/guix/commit/gnu/packages/perl.scm?id=013086c3dbaa2e28dd1b3c21a7ebe51ac829a1eb'>gnu: Add perl-5.14.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/perl-5.14-autosplit-default-time.patch,
gnu/packages/patches/perl-5.14-module-pluggable-search.patch,
gnu/packages/patches/perl-5.14-no-sys-dirs.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/perl.scm (perl-5.14): New variable.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2022-02-03 23:39:47 +0100'>2022-02-03</span></td><td><a href='/guix/commit/gnu/packages/perl.scm?id=9396fef40998ba6b580b2d6c5c7b774b7a6ccd1e'>gnu: Add perl-date-range.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/perl.scm (perl-date-range): New variable.
</span></span></td><td>Marius Bakke</td></tr>