diff --git a/.gitignore b/.gitignore
index ff8993b..ef57ec0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ files.lst
 *.o
 *.so
 pcompress
+libpcompress*
 Makefile
 test.log
 test/datafiles
diff --git a/Makefile.in b/Makefile.in
index 0a92d9b..4e24006 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -215,8 +215,8 @@ DEBUG_CPPFLAGS = $(COMMON_CPPFLAGS)
 DEBUG_FPTR_FLAG = 
 
 RELEASE_LINK = g++ -pthread @LIBBSCGEN_OPT@ @EXTRA_OPT_FLAGS@ -fopenmp -fPIC
-RELEASE_COMPILE = gcc -c @EXTRA_OPT_FLAGS@ -fPIC
-RELEASE_COMPILE_cpp = g++ -c @EXTRA_OPT_FLAGS@ -fPIC
+RELEASE_COMPILE = gcc -c @EXTRA_OPT_FLAGS@ -fPIC -fvisibility=hidden
+RELEASE_COMPILE_cpp = g++ -c @EXTRA_OPT_FLAGS@ -fPIC -fvisibility=hidden
 RELEASE_VEC_FLAGS = $(COMMON_VEC_FLAGS)
 RELEASE_LOOP_OPTFLAGS = $(COMMON_LOOP_OPTFLAGS)
 RELEASE_CPPFLAGS = $(COMMON_CPPFLAGS) -DNDEBUG
diff --git a/pcompress.c b/pcompress.c
index f0e661c..d7afe6b 100644
--- a/pcompress.c
+++ b/pcompress.c
@@ -78,7 +78,7 @@ static void * writer_thread(void *dat);
 static int init_algo(pc_ctx_t *pctx, const char *algo, int bail);
 extern uint32_t lzma_crc32(const uint8_t *buf, uint64_t size, uint32_t crc);
 
-void
+void DLL_EXPORT
 usage(pc_ctx_t *pctx)
 {
 	fprintf(stderr,
@@ -686,7 +686,7 @@ cont:
  */
 #define UNCOMP_BAIL err = 1; goto uncomp_done
 
-int
+int DLL_EXPORT
 start_decompress(pc_ctx_t *pctx, const char *filename, const char *to_filename)
 {
 	char algorithm[ALGO_SZ];
@@ -1689,7 +1689,7 @@ do_cancel:
  */
 #define COMP_BAIL err = 1; goto comp_done
 
-int
+int DLL_EXPORT
 start_compress(pc_ctx_t *pctx, const char *filename, uint64_t chunksize, int level)
 {
 	struct wdata w;
@@ -2516,7 +2516,7 @@ init_algo(pc_ctx_t *pctx, const char *algo, int bail)
 /*
  * Pcompress context handling functions.
  */
-pc_ctx_t *
+pc_ctx_t DLL_EXPORT * 
 create_pc_context(void)
 {
 	pc_ctx_t *ctx = (pc_ctx_t *)malloc(sizeof (pc_ctx_t));
@@ -2537,7 +2537,7 @@ create_pc_context(void)
 	return (ctx);
 }
 
-void
+void DLL_EXPORT
 destroy_pc_context(pc_ctx_t *pctx)
 {
 	if (pctx->do_compress)
@@ -2549,7 +2549,7 @@ destroy_pc_context(pc_ctx_t *pctx)
 	slab_cleanup(pctx->hide_mem_stats);
 }
 
-int
+int DLL_EXPORT
 init_pc_context_argstr(pc_ctx_t *pctx, char *args)
 {
 	int ac;
@@ -2568,7 +2568,7 @@ init_pc_context_argstr(pc_ctx_t *pctx, char *args)
 	return (0);
 }
 
-int
+int DLL_EXPORT
 init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 {
 	int opt, num_rem, err, my_optind;
@@ -2859,7 +2859,7 @@ init_pc_context(pc_ctx_t *pctx, int argc, char *argv[])
 	return (0);
 }
 
-int
+int DLL_EXPORT
 start_pcompress(pc_ctx_t *pctx)
 {
 	int err;
@@ -2877,7 +2877,7 @@ start_pcompress(pc_ctx_t *pctx)
 /*
  * Setter functions for various parameters in the context.
  */
-void
+void DLL_EXPORT
 pc_set_userpw(pc_ctx_t *pctx, unsigned char *pwdata, int pwlen)
 {
 	pctx->user_pw = pwdata;
diff --git a/ppmd_compress.c b/ppmd_compress.c
index 8d0e74f..e2cd618 100644
--- a/ppmd_compress.c
+++ b/ppmd_compress.c
@@ -34,7 +34,7 @@
 /*
  * PPMd model order to working set memory size mappings.
  */
-unsigned int ppmd8_mem_sz[] = {
+static unsigned int ppmd8_mem_sz[] = {
 	(16 << 20),
 	(16 << 20),
 	(32 << 20),
diff --git a/utils/cpuid.c b/utils/cpuid.c
index 3fe06c7..6a927b3 100644
--- a/utils/cpuid.c
+++ b/utils/cpuid.c
@@ -62,7 +62,7 @@
 #define	XOP_FLAG		0x800
 #define	AES_FLAG		0x2000000
 
-void
+static void
 exec_cpuid(uint32_t *regs)
 {
 #ifdef __GNUC__
diff --git a/utils/cpuid.h b/utils/cpuid.h
index 643839e..26edbdf 100644
--- a/utils/cpuid.h
+++ b/utils/cpuid.h
@@ -14,10 +14,10 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this program.
- * If not, see <http://www.gnu.org/licenses/>.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program.
+ * If not, see <http://www.gnu.org/licenses/>.
  *
  * moinakg@belenix.org, http://moinakg.wordpress.com/
  */
@@ -93,7 +93,6 @@ struct cpu_raw_data_t {
 	char vendor_str[VENDOR_STR_MAX];
 };
 
-void exec_cpuid(uint32_t *regs);
 void cpuid_get_raw_data(struct cpu_raw_data_t* data);
 void cpuid_basic_identify(processor_info_t *pc);
 
diff --git a/utils/utils.h b/utils/utils.h
index 96f257b..3786940 100644
--- a/utils/utils.h
+++ b/utils/utils.h
@@ -134,6 +134,14 @@ typedef int32_t bsize_t;
 #	endif
 #endif
 
+#ifdef __GNUC__
+#define DLL_EXPORT __attribute__ ((visibility ("default")))
+#define DLL_LOCAL  __attribute__ ((visibility ("hidden")))
+#else
+#define DLL_EXPORT
+#define DLL_LOCAL
+#endif
+
 #define ISP2(x) ((x != 0) && ((x & (~x + 1)) == x))
 
 #ifdef	DEBUG_STATS