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--- src/makefile.orig
+++ src/makefile
@@ -49,7 +49,7 @@
 
 # Specify the installation home directory.
 
-INSTALL_DIR = $(HOME)
+INSTALL_DIR = $(DESTDIR)/usr
 
 # Specify the installation directory for the library.
 
@@ -63,9 +63,9 @@
 # of your preferred C compiler (CCOMPC) and compilation flags (CFLAGF
 # for functions, CFLAGX for executables) here.
 
-CCOMPC = gcc
-CFLAGF = -c -pedantic -Wall -W -O
-CFLAGX = -pedantic -Wall -W -O
+CCOMPC = $(CC)
+CFLAGF = $(CPPFLAGS) -I. -c -fPIC $(CFLAGS)
+CFLAGX = $(CPPFLAGS) -I. $(CFLAGS)
 
 #----YOU SHOULDN'T HAVE TO MODIFY ANYTHING BELOW THIS LINE---------
 
@@ -80,6 +80,11 @@
 SOFA_LIB_NAME = libsofa_c.a
 SOFA_LIB = $(SOFA_LIB_DIR)$(SOFA_LIB_NAME)
 
+# Name the SOFA/C library in its source and target locations.
+
+SOFA_SHLIB_NAME = libsofa_c.so
+SOFA_SHLIB = $(SOFA_LIB_DIR)$(SOFA_SHLIB_NAME)
+
 # Name the SOFA/C testbed in its source and target locations.
 
 SOFA_TEST_NAME = t_sofa_c.c
@@ -88,7 +93,7 @@
 # Name the SOFA/C includes in their source and target locations.
 
 SOFA_INC_NAMES = sofa.h sofam.h
-SOFA_INC = $(SOFA_INC_DIR)sofa.h $(SOFA_INC_DIR)sofam.h
+SOFA_INC = $(SOFA_INC_NAMES:%=$(SOFA_INC_DIR)%)
 
 # The list of SOFA/C library object files.
 
@@ -321,28 +326,31 @@
 #-----------------------------------------------------------------------
 
 # Build (but do not install) the library.
-all : $(SOFA_LIB_NAME)
+all : $(SOFA_SHLIB_NAME)
 	-@ echo ""
 	-@ echo "*** Now type 'make test'" \
                 " to install the library and run tests ***"
 	-@ echo ""
 
 # Install the library and header files.
-install $(SOFA_LIB) : $(INSTALL_DIRS) $(SOFA_LIB_NAME) $(SOFA_INC)
-	cp $(SOFA_LIB_NAME) $(SOFA_LIB_DIR)
+install: $(INSTALL_DIRS) $(SOFA_SHLIB_NAME) $(SOFA_INC)
+	cp $(SOFA_SHLIB_NAME).0.0 $(SOFA_LIB_DIR)
+	ln -s $(SOFA_SHLIB_NAME).0.0 $(SOFA_SHLIB).0
+	ln -s $(SOFA_SHLIB_NAME).0 $(SOFA_SHLIB)
+
 
 # Deinstall the library and header files.
 uninstall:
-	- $(RM) $(SOFA_LIB) $(SOFA_INC)
+	- $(RM) $(SOFA_LIB) $(SOFA_SHLIB)* $(SOFA_INC)
 
 # Test the build.
-check: $(SOFA_TEST_NAME) $(SOFA_INC_NAMES) $(SOFA_LIB_NAME)
-	$(CCOMPC) $(CFLAGX) $(SOFA_TEST_NAME) $(SOFA_LIB_NAME) \
+check: $(SOFA_TEST_NAME) $(SOFA_INC_NAMES) $(SOFA_SHLIB_NAME)
+	$(CCOMPC) $(CFLAGX) $(SOFA_TEST_NAME) $(SOFA_SHLIB_NAME).0.0 \
         -lm -o $(SOFA_TEST)
-	./$(SOFA_TEST)
+	LD_LIBRARY_PATH="$${LD_LIBRARY_PATH}:." ./$(SOFA_TEST)
 
 # Test the installed library.
-installcheck test: $(SOFA_TEST_NAME) $(SOFA_INC) $(SOFA_LIB)
+installcheck: $(SOFA_TEST_NAME) $(SOFA_INC) $(SOFA_LIB)
 	$(CCOMPC) $(CFLAGX) $(SOFA_TEST_NAME) -I$(SOFA_INC_DIR) \
         -L$(SOFA_LIB_DIR) -lsofa_c -lm -o $(SOFA_TEST)
 	./$(SOFA_TEST)
@@ -353,7 +361,7 @@
 
 # Delete all generated binaries in the current directory.
 realclean distclean : clean
-	- $(RM) $(SOFA_LIB_NAME) $(SOFA_TEST)
+	- $(RM) $(SOFA_LIB_NAME) $(SOFA_SHLIB_NAME)* $(SOFA_TEST)
 
 # Create the installation directories if not already present.
 $(INSTALL_DIRS):
@@ -363,6 +371,10 @@
 $(SOFA_LIB_NAME): $(SOFA_OBS)
 	ar ru $(SOFA_LIB_NAME) $?
 
+$(SOFA_SHLIB_NAME): $(SOFA_OBS)
+	$(CC) $(LDFLAGS) -shared -Wl,-soname,$(SOFA_SHLIB_NAME).0 $? -lm -o $(SOFA_SHLIB_NAME).0.0
+	ln -sfn $(SOFA_SHLIB_NAME).0.0 $(SOFA_SHLIB_NAME).0
+
 # Install the header files.
 $(SOFA_INC) : $(INSTALL_DIRS) $(SOFA_INC_NAMES)
 	cp $(SOFA_INC_NAMES) $(SOFA_INC_DIR)