diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -20,8 +20,8 @@
 # Do not specify CFLAGS or LIBS on the make invocation line - specify
 # XCFLAGS or XLIBS instead. Make ignores any lines in the makefile that
 # set a variable that was set on the command line.
-CFLAGS += $(XCFLAGS) -Iinclude
-LIBS += $(XLIBS) -lm
+CFLAGS += $(XCFLAGS) -Iinclude -fPIC
+LIBS += $(XLIBS) $(THIRD_LIBS) -lm
 
 ifneq ($(threading),no)
   ifeq ($(HAVE_PTHREAD),yes)
@@ -190,17 +190,20 @@
 
 # --- Library ---
 
-MUPDF_LIB = $(OUT)/libmupdf.a
-THIRD_LIB = $(OUT)/libmupdf-third.a
-THREAD_LIB = $(OUT)/libmupdf-threads.a
+MUPDF_LIB = $(OUT)/libmupdf.so
+THIRD_LIB = $(OUT)/libmupdf-third.so
+THREAD_LIB = $(OUT)/libmupdf-threads.so
 PKCS7_LIB = $(OUT)/libmupdf-pkcs7.a
 
-$(MUPDF_LIB) : $(MUPDF_OBJ)
+$(MUPDF_LIB) : $(MUPDF_OBJ) $(THIRD_LIB)
+	$(LINK_CMD) -shared -Wl,-soname -Wl,libmupdf.so -Wl,--no-undefined
 $(THIRD_LIB) : $(THIRD_OBJ)
+	$(LINK_CMD) -shared -Wl,-soname -Wl,libmupdf-third.so -Wl,--no-undefined
 $(THREAD_LIB) : $(THREAD_OBJ)
+	$(LINK_CMD) -pthread -shared -Wl,-soname -Wl,libmupdf-threads.so -Wl,--no-undefined
 $(PKCS7_LIB) : $(PKCS7_OBJ)
 
-INSTALL_LIBS := $(MUPDF_LIB) $(THIRD_LIB)
+INSTALL_LIBS := $(MUPDF_LIB) $(THIRD_LIB) $(THREAD_LIB)
 
 # --- Main tools and viewers ---