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=049e06b603ef0b8fcf5fa314379b9c525c58f53f'>root</a>/<a href='/guix/log/gnu?id=049e06b603ef0b8fcf5fa314379b9c525c58f53f'>gnu</a>/<a href='/guix/log/gnu/packages?id=049e06b603ef0b8fcf5fa314379b9c525c58f53f'>packages</a>/<a href='/guix/log/gnu/packages/djvu.scm?id=049e06b603ef0b8fcf5fa314379b9c525c58f53f'>djvu.scm</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/gnu/packages/djvu.scm?id=049e06b603ef0b8fcf5fa314379b9c525c58f53f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-29 14:36:57 +0100'>2020-11-29</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=7c2e67400ffaef8eb6f30ef7126c976ee3d7e36c'>gnu: Add ocrodjvu.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-29 14:36:57 +0100'>2020-11-29</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=e7fb2c6e7b1caa90bd346292b1325ab8f0d8a4d7'>gnu: Add didjvu.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-26 20:44:39 +0100'>2020-11-26</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=f404fc1b36561e90aa82c9d11630c5217754cc6e'>gnu: djvulibre: Remove bundled software.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-26 20:44:39 +0100'>2020-11-26</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=2aa8e8476dfa7ef0552f5d66fc2887c6e65051f1'>gnu: djvulibre: Update to 3.5.28.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-26 09:37:34 +0100'>2020-11-26</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=446ec88a4021e1fadc34a6e4c29d6c8105c841b2'>gnu: djvusmooth: Fix path to djvused.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-23 22:12:18 +0100'>2020-11-23</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=8cc6cd3429a1f5d9e31a48e420b53e4e2acda84f'>gnu: djview: Update to 4.12.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-11-23 13:28:19 +0100'>2020-11-23</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=f14c6af5dc0d4924a44edb133cee37b42a935bc6'>gnu: Add djvusmooth.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-22 14:28:45 +0100'>2020-11-22</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=b7c392a697992e3c420e1eee4e222736618ce601'>gnu: Add minidjvu.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-22 14:28:45 +0100'>2020-11-22</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=e75d121ca47701869c776b86765486690a28b1e2'>gnu: djvulibre: Add JPEG and TIFF support.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-22 14:28:45 +0100'>2020-11-22</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=42c8c30ff3e13e7b1572a7483f9424e21d3dd1ca'>gnu: Add djvu2pdf.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>
<tr><td><span title='2020-11-16 11:23:57 +0100'>2020-11-16</span></td><td><a href='/guix/commit/gnu/packages/djvu.scm?id=f6a42ac946edccc7de5e93ee247487cbec40072b'>gnu: Add pdf2djvu.</a><span class='msg-avail'>...</span></td><td>Guillaume Le Vaillant</td></tr>