diff --git a/libXorcode.sym b/libXorcode.sym
index d51602f..f635e49 100644
--- a/libXorcode.sym
+++ b/libXorcode.sym
@@ -1,18 +1,4 @@
-T data_bit_lookup
-T does_parity_have_data
-T fast_memcpy
-T get_failure_pattern
-T get_missing_data
-T get_missing_parity
-T index_of_connected_parity
 T init_xor_hd_code
-T is_data_in_parity
-T missing_elements_bm
-T num_missing_data_in_parity
-T parity_bit_lookup
-T remove_from_missing_list
-T selective_encode
-T xor_bufs_and_store
 T xor_code_encode
 T xor_hd_decode
 T xor_hd_fragments_needed
diff --git a/liberasurecode.sym b/liberasurecode.sym
index c5936bc..6ceca8d 100644
--- a/liberasurecode.sym
+++ b/liberasurecode.sym
@@ -1,49 +1,11 @@
-D backend_flat_xor_hd
-D backend_isa_l_rs_cauchy
-D backend_isa_l_rs_vand
-D backend_jerasure_rs_cauchy
-D backend_jerasure_rs_vand
-D backend_liberasurecode_rs_vand
-D backend_libphazr
-D backend_null
-D backend_shss
-T add_fragment_metadata
 T alloc_and_set_buffer
-T alloc_fragment_buffer
-T alloc_zeroed_buffer
-T check_and_free_buffer
-T compute_alg_sig
-T destroy_alg_sig
-T finalize_fragments_after_encode
-T fragments_to_string
-T free_fragment_buffer
-T get_aligned_buffer16
-T get_aligned_data_size
 T get_backend_id
 T get_backend_version
-T get_data_ptr_array_from_fragments
 T get_data_ptr_from_fragment
-T get_fragment_backend_metadata_size
-T get_fragment_buffer_size
-T get_fragment_idx
 T get_fragment_partition
-T get_fragment_payload_size
-T get_fragment_ptr_array_from_data
-T get_fragment_ptr_from_data
-T get_fragment_ptr_from_data_novalidate
-T get_fragment_size
 T get_libec_version
-T get_orig_data_size
-T init_alg_sig
 T is_invalid_fragment
 T is_invalid_fragment_header
-T isa_l_common_init
-T isa_l_decode
-T isa_l_element_size
-T isa_l_encode
-T isa_l_exit
-T isa_l_min_fragments
-T isa_l_reconstruct
 T liberasurecode_backend_available
 T liberasurecode_backend_instance_get_by_desc
 T liberasurecode_crc32_alt
@@ -64,13 +26,3 @@ T liberasurecode_instance_destroy
 T liberasurecode_reconstruct_fragment
 T liberasurecode_verify_fragment_metadata
 T liberasurecode_verify_stripe_metadata
-T prepare_fragments_for_decode
-T prepare_fragments_for_encode
-T set_backend_id
-T set_backend_version
-T set_checksum
-T set_fragment_backend_metadata_size
-T set_fragment_idx
-T set_fragment_payload_size
-T set_libec_version
-T set_orig_data_size
diff --git a/liberasurecode_rs_vand.sym b/liberasurecode_rs_vand.sym
index 4f71bc5..eed7f1b 100644
--- a/liberasurecode_rs_vand.sym
+++ b/liberasurecode_rs_vand.sym
@@ -10,8 +10,4 @@ T liberasurecode_rs_vand_encode
 T liberasurecode_rs_vand_reconstruct
 T make_systematic_matrix
 T print_matrix
-T rs_galois_deinit_tables
-T rs_galois_init_tables
-T rs_galois_inverse
-T rs_galois_mult
 T square_matrix_multiply
diff --git a/src/backends/isa-l/isa_l_common.c b/src/backends/isa-l/isa_l_common.c
index 63e7cca..0e9eb5c 100644
--- a/src/backends/isa-l/isa_l_common.c
+++ b/src/backends/isa-l/isa_l_common.c
@@ -36,6 +36,7 @@
 #include "erasurecode_helpers_ext.h"
 #include "isa_l_common.h"
 
+__attribute__ ((visibility ("internal")))
 int isa_l_encode(void *desc, char **data, char **parity,
         int blocksize)
 {
@@ -176,6 +177,7 @@ static unsigned char* get_inverse_rows(int k,
     return inverse_rows;
 }
 
+__attribute__ ((visibility ("internal")))
 int isa_l_decode(void *desc, char **data, char **parity,
         int *missing_idxs, int blocksize)
 {
@@ -280,6 +282,7 @@ out:
     return ret;
 }
 
+__attribute__ ((visibility ("internal")))
 int isa_l_reconstruct(void *desc, char **data, char **parity,
         int *missing_idxs, int destination_idx, int blocksize)
 {
@@ -392,6 +395,7 @@ out:
     return ret;
 }
 
+__attribute__ ((visibility ("internal")))
 int isa_l_min_fragments(void *desc, int *missing_idxs,
         int *fragments_to_exclude, int *fragments_needed)
 {
@@ -424,11 +428,13 @@ int isa_l_min_fragments(void *desc, int *missing_idxs,
  *
  * Returns the size in bits!
  */
+__attribute__ ((visibility ("internal")))
 int isa_l_element_size(void* desc)
 {
   return 8;
 }
 
+__attribute__ ((visibility ("internal")))
 int isa_l_exit(void *desc)
 {
     isa_l_descriptor *isa_l_desc = NULL;
@@ -443,6 +449,7 @@ int isa_l_exit(void *desc)
 }
 
 
+__attribute__ ((visibility ("internal")))
 void * isa_l_common_init(struct ec_backend_args *args, void *backend_sohandle,
         const char* gen_matrix_func_name)
 {
diff --git a/src/backends/isa-l/isa_l_rs_cauchy.c b/src/backends/isa-l/isa_l_rs_cauchy.c
index a15f70a..a0bc2da 100644
--- a/src/backends/isa-l/isa_l_rs_cauchy.c
+++ b/src/backends/isa-l/isa_l_rs_cauchy.c
@@ -73,6 +73,7 @@ static struct ec_backend_op_stubs isa_l_rs_cauchy_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_isa_l_rs_cauchy = {
     .id                         = EC_BACKEND_ISA_L_RS_CAUCHY,
     .name                       = ISA_L_RS_CAUCHY_LIB_NAME,
diff --git a/src/backends/isa-l/isa_l_rs_vand.c b/src/backends/isa-l/isa_l_rs_vand.c
index 4577276..280f863 100644
--- a/src/backends/isa-l/isa_l_rs_vand.c
+++ b/src/backends/isa-l/isa_l_rs_vand.c
@@ -72,6 +72,7 @@ static struct ec_backend_op_stubs isa_l_rs_vand_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_isa_l_rs_vand = {
     .id                         = EC_BACKEND_ISA_L_RS_VAND,
     .name                       = ISA_L_RS_VAND_LIB_NAME,
diff --git a/src/backends/jerasure/jerasure_rs_cauchy.c b/src/backends/jerasure/jerasure_rs_cauchy.c
index d3d68a5..61099d1 100644
--- a/src/backends/jerasure/jerasure_rs_cauchy.c
+++ b/src/backends/jerasure/jerasure_rs_cauchy.c
@@ -462,6 +462,7 @@ static struct ec_backend_op_stubs jerasure_rs_cauchy_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_jerasure_rs_cauchy = {
     .id                         = EC_BACKEND_JERASURE_RS_CAUCHY,
     .name                       = JERASURE_RS_CAUCHY_LIB_NAME,
diff --git a/src/backends/jerasure/jerasure_rs_vand.c b/src/backends/jerasure/jerasure_rs_vand.c
index 3702b34..c536c24 100644
--- a/src/backends/jerasure/jerasure_rs_vand.c
+++ b/src/backends/jerasure/jerasure_rs_vand.c
@@ -370,6 +370,7 @@ static struct ec_backend_op_stubs jerasure_rs_vand_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_jerasure_rs_vand = {
     .id                         = EC_BACKEND_JERASURE_RS_VAND,
     .name                       = JERASURE_RS_VAND_LIB_NAME,
diff --git a/src/backends/null/null.c b/src/backends/null/null.c
index 5e61c20..1626e5f 100644
--- a/src/backends/null/null.c
+++ b/src/backends/null/null.c
@@ -226,6 +226,7 @@ static struct ec_backend_op_stubs null_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_null = {
     .id                         = EC_BACKEND_NULL,
     .name                       = NULL_LIB_NAME,
diff --git a/src/backends/phazrio/libphazr.c b/src/backends/phazrio/libphazr.c
index ce133d5..9b7739a 100644
--- a/src/backends/phazrio/libphazr.c
+++ b/src/backends/phazrio/libphazr.c
@@ -377,6 +377,7 @@ static struct ec_backend_op_stubs libphazr_op_stubs = {
     .GETENCODEOFFSET            = pio_get_encode_offset,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_libphazr = {
     .id                         = EC_BACKEND_LIBPHAZR,
     .name                       = LIBPHAZR_LIB_NAME,
diff --git a/src/backends/rs_vand/liberasurecode_rs_vand.c b/src/backends/rs_vand/liberasurecode_rs_vand.c
index c79d3fe..ed147e0 100644
--- a/src/backends/rs_vand/liberasurecode_rs_vand.c
+++ b/src/backends/rs_vand/liberasurecode_rs_vand.c
@@ -300,6 +300,7 @@ static struct ec_backend_op_stubs liberasurecode_rs_vand_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_liberasurecode_rs_vand = {
     .id                         = EC_BACKEND_LIBERASURECODE_RS_VAND,
     .name                       = LIBERASURECODE_RS_VAND_LIB_NAME,
diff --git a/src/backends/shss/shss.c b/src/backends/shss/shss.c
index e333505..7752e57 100644
--- a/src/backends/shss/shss.c
+++ b/src/backends/shss/shss.c
@@ -301,6 +301,7 @@ static struct ec_backend_op_stubs shss_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_shss = {
     .id                         = EC_BACKEND_SHSS,
     .name                       = SHSS_LIB_NAME,
diff --git a/src/backends/xor/flat_xor_hd.c b/src/backends/xor/flat_xor_hd.c
index 6673d06..735a7f9 100644
--- a/src/backends/xor/flat_xor_hd.c
+++ b/src/backends/xor/flat_xor_hd.c
@@ -180,6 +180,7 @@ static struct ec_backend_op_stubs flat_xor_hd_op_stubs = {
     .GETENCODEOFFSET            = get_encode_offset_zero,
 };
 
+__attribute__ ((visibility ("internal")))
 struct ec_backend_common backend_flat_xor_hd = {
     .id                         = EC_BACKEND_FLAT_XOR_HD,
     .name                       = FLAT_XOR_LIB_NAME,
diff --git a/src/builtin/rs_vand/rs_galois.c b/src/builtin/rs_vand/rs_galois.c
index 4d6c4f9..1cdb121 100644
--- a/src/builtin/rs_vand/rs_galois.c
+++ b/src/builtin/rs_vand/rs_galois.c
@@ -46,6 +46,7 @@ static int *ilog_table = NULL;
 static int *ilog_table_begin = NULL;
 static int init_counter = 0;
 
+__attribute__ ((visibility ("internal")))
 void rs_galois_init_tables(void)
 {
   if (init_counter++ > 0) {
@@ -70,6 +71,7 @@ void rs_galois_init_tables(void)
   ilog_table = &ilog_table_begin[GROUP_SIZE];
 }
 
+__attribute__ ((visibility ("internal")))
 void rs_galois_deinit_tables(void)
 {
   init_counter--;
@@ -87,6 +89,7 @@ void rs_galois_deinit_tables(void)
   }
 }
 
+__attribute__ ((visibility ("internal")))
 int rs_galois_mult(int x, int y)
 {
   int sum;
@@ -111,6 +114,7 @@ static int rs_galois_div(int x, int y)
   return ilog_table[diff];
 }
 
+__attribute__ ((visibility ("internal")))
 int rs_galois_inverse(int x)
 {
   return rs_galois_div(1, x);
diff --git a/src/builtin/xor_codes/xor_code.c b/src/builtin/xor_codes/xor_code.c
index aa1753c..8d7a875 100644
--- a/src/builtin/xor_codes/xor_code.c
+++ b/src/builtin/xor_codes/xor_code.c
@@ -40,26 +40,31 @@ static const int g_bit_lookup[] = {0x1, 0x2, 0x4, 0x8,
                                    0x1000000, 0x2000000, 0x4000000, 0x8000000,
                                    0x10000000, 0x20000000, 0x40000000, 0x80000000};
 
+__attribute__ ((visibility ("internal")))
 int is_data_in_parity(int data_idx, unsigned int parity_bm)
 {
   return ((g_bit_lookup[data_idx] & parity_bm) == g_bit_lookup[data_idx]);
 }
 
+__attribute__ ((visibility ("internal")))
 int does_parity_have_data(int parity_idx, unsigned int data_bm)
 {
   return ((g_bit_lookup[parity_idx] & data_bm) == g_bit_lookup[parity_idx]);
 }
 
+__attribute__ ((visibility ("internal")))
 int parity_bit_lookup(xor_code_t *code_desc, int index)
 {
   return g_bit_lookup[code_desc->k - index];
 }
 
+__attribute__ ((visibility ("internal")))
 int data_bit_lookup(xor_code_t *code_desc, int index)
 {
   return g_bit_lookup[index];
 }
 
+__attribute__ ((visibility ("internal")))
 int missing_elements_bm(xor_code_t *code_desc, int *missing_elements, int (*bit_lookup_func)(xor_code_t *code_desc, int index))
 {
   int i = 0;
@@ -73,6 +78,7 @@ int missing_elements_bm(xor_code_t *code_desc, int *missing_elements, int (*bit_
   return bm;
 }
 
+__attribute__ ((visibility ("internal")))
 failure_pattern_t get_failure_pattern(xor_code_t *code_desc, int *missing_idxs)
 {
   int i = 0;
@@ -127,6 +133,7 @@ failure_pattern_t get_failure_pattern(xor_code_t *code_desc, int *missing_idxs)
   return pattern;
 }
 
+__attribute__ ((visibility ("internal")))
 void fast_memcpy(char *dst, char *src, int size)
 {
     // Use _mm_stream_si128((__m128i*) _buf2, sum);
@@ -138,6 +145,7 @@ void fast_memcpy(char *dst, char *src, int size)
  *
  * Store in buf2 (opposite of memcpy convention...  Maybe change?)
  */
+__attribute__ ((visibility ("internal")))
 void xor_bufs_and_store(char *buf1, char *buf2, int blocksize)
 {
 #ifdef INTEL_SSE2
@@ -190,6 +198,7 @@ void xor_code_encode(xor_code_t *code_desc, char **data, char **parity, int bloc
   }
 }
 
+__attribute__ ((visibility ("internal")))
 void selective_encode(xor_code_t *code_desc, char **data, char **parity, int *missing_parity, int blocksize)
 {
   int i;
@@ -205,6 +214,7 @@ void selective_encode(xor_code_t *code_desc, char **data, char **parity, int *mi
   }
 }
 
+__attribute__ ((visibility ("internal")))
 int * get_missing_parity(xor_code_t *code_desc, int *missing_idxs)
 {
   int *missing_parity = (int*)malloc(sizeof(int)*MAX_PARITY);
@@ -222,6 +232,7 @@ int * get_missing_parity(xor_code_t *code_desc, int *missing_idxs)
   return missing_parity;
 }
 
+__attribute__ ((visibility ("internal")))
 int * get_missing_data(xor_code_t *code_desc, int *missing_idxs)
 {
   int *missing_data = (int*)malloc(sizeof(int)*MAX_DATA);
@@ -306,6 +317,7 @@ void xor_reconstruct_one(xor_code_t *code_desc, char **data, char **parity, int
   free(missing_parity);
 }
 
+__attribute__ ((visibility ("internal")))
 int num_missing_data_in_parity(xor_code_t *code_desc, int parity_idx, int *missing_data)
 {
   int i = 0;
@@ -325,6 +337,7 @@ int num_missing_data_in_parity(xor_code_t *code_desc, int parity_idx, int *missi
   return num_missing_data;
 }
 
+__attribute__ ((visibility ("internal")))
 int index_of_connected_parity(xor_code_t *code_desc, int data_index, int *missing_parity, int *missing_data)
 {
   int parity_index = -1;
@@ -360,6 +373,7 @@ int index_of_connected_parity(xor_code_t *code_desc, int data_index, int *missin
   return parity_index > -1 ? parity_index + code_desc->k : parity_index;
 }
 
+__attribute__ ((visibility ("internal")))
 void remove_from_missing_list(int element, int *missing_list)
 {
   int i = 0;
diff --git a/src/erasurecode_helpers.c b/src/erasurecode_helpers.c
index b38fd81..7ad6343 100644
--- a/src/erasurecode_helpers.c
+++ b/src/erasurecode_helpers.c
@@ -58,6 +58,7 @@ static bool is_fragment(char *buf)
  * The following methods provide wrappers for allocating and deallocating
  * memory.
  */
+__attribute__ ((visibility ("internal")))
 void *get_aligned_buffer16(int size)
 {
     void *buf;
@@ -81,6 +82,7 @@ void *get_aligned_buffer16(int size)
  * @param size integer size in bytes of buffer to allocate
  * @return pointer to start of allocated buffer or NULL on error
  */
+__attribute__ ((visibility ("internal")))
 void * alloc_zeroed_buffer(int size)
 {
     return alloc_and_set_buffer(size, 0);
@@ -113,6 +115,7 @@ void * alloc_and_set_buffer(int size, int value) {
  *
  * @return NULL
  */
+__attribute__ ((visibility ("internal")))
 void * check_and_free_buffer(void * buf)
 {
     if (buf)
@@ -120,6 +123,7 @@ void * check_and_free_buffer(void * buf)
     return NULL;
 }
 
+__attribute__ ((visibility ("internal")))
 char *alloc_fragment_buffer(int size)
 {
     char *buf;
@@ -136,6 +140,7 @@ char *alloc_fragment_buffer(int size)
     return buf;
 }
 
+__attribute__ ((visibility ("internal")))
 int free_fragment_buffer(char *buf)
 {
     fragment_header_t *header;
@@ -165,6 +170,7 @@ int free_fragment_buffer(char *buf)
  *
  * @return fragment size on disk
  */
+__attribute__ ((visibility ("internal")))
 uint64_t get_fragment_size(char *buf)
 {
 
@@ -182,6 +188,7 @@ uint64_t get_fragment_size(char *buf)
  * @param data_len - integer length of data in bytes
  * @return integer data length aligned with wordsize of EC algorithm
  */
+__attribute__ ((visibility ("internal")))
 int get_aligned_data_size(ec_backend_t instance, int data_len)
 {
     int k = instance->args.uargs.k;
@@ -215,6 +222,7 @@ char *get_data_ptr_from_fragment(char *buf)
     return buf;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_data_ptr_array_from_fragments(char **data_array, char **fragments,
                                       int num_fragments)
 {
@@ -231,6 +239,7 @@ int get_data_ptr_array_from_fragments(char **data_array, char **fragments,
     return num;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_fragment_ptr_array_from_data(char **frag_array, char **data,
                                      int num_data)
 {
@@ -247,6 +256,7 @@ int get_fragment_ptr_array_from_data(char **frag_array, char **data,
     return num;
 }
 
+__attribute__ ((visibility ("internal")))
 char *get_fragment_ptr_from_data_novalidate(char *buf)
 {
     buf -= sizeof(fragment_header_t);
@@ -254,6 +264,7 @@ char *get_fragment_ptr_from_data_novalidate(char *buf)
     return buf;
 }
 
+__attribute__ ((visibility ("internal")))
 char *get_fragment_ptr_from_data(char *buf)
 {
     fragment_header_t *header;
@@ -272,6 +283,7 @@ char *get_fragment_ptr_from_data(char *buf)
 
 /* ==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~== */
 
+__attribute__ ((visibility ("internal")))
 int set_fragment_idx(char *buf, int idx)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -287,6 +299,7 @@ int set_fragment_idx(char *buf, int idx)
     return 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_fragment_idx(char *buf)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -300,6 +313,7 @@ int get_fragment_idx(char *buf)
     return header->meta.idx;
 }
 
+__attribute__ ((visibility ("internal")))
 int set_fragment_payload_size(char *buf, int size)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -315,6 +329,7 @@ int set_fragment_payload_size(char *buf, int size)
     return 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_fragment_payload_size(char *buf)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -328,6 +343,7 @@ int get_fragment_payload_size(char *buf)
     return header->meta.size;
 }
 
+__attribute__ ((visibility ("internal")))
 int set_fragment_backend_metadata_size(char *buf, int size)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -343,6 +359,7 @@ int set_fragment_backend_metadata_size(char *buf, int size)
     return 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_fragment_backend_metadata_size(char *buf)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -356,6 +373,7 @@ int get_fragment_backend_metadata_size(char *buf)
     return header->meta.frag_backend_metadata_size;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_fragment_buffer_size(char *buf)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -369,6 +387,7 @@ int get_fragment_buffer_size(char *buf)
     return header->meta.size + header->meta.frag_backend_metadata_size;
 }
 
+__attribute__ ((visibility ("internal")))
 int set_orig_data_size(char *buf, int orig_data_size)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -384,6 +403,7 @@ int set_orig_data_size(char *buf, int orig_data_size)
     return 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int get_orig_data_size(char *buf)
 {
     fragment_header_t *header = (fragment_header_t *) buf;
@@ -397,6 +417,7 @@ int get_orig_data_size(char *buf)
     return header->meta.orig_data_size;
 }
 
+__attribute__ ((visibility ("internal")))
 int set_libec_version(char *buf)
 {
     if (!is_fragment(buf)) {
@@ -417,6 +438,7 @@ int get_libec_version(char *buf, uint32_t *ver)
     return 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int set_backend_id(char *buf, ec_backend_id_t id)
 {
     if (!is_fragment(buf)) {
@@ -437,6 +459,7 @@ int get_backend_id(char *buf, ec_backend_id_t *id)
     return 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int set_backend_version(char *buf, uint32_t version)
 {
     if (!is_fragment(buf)) {
@@ -459,6 +482,7 @@ int get_backend_version(char *buf, uint32_t *version)
 
 /* ==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~==~=*=~== */
 
+__attribute__ ((visibility ("internal")))
 inline int set_checksum(ec_checksum_type_t ct, char *buf, int blocksize)
 {
     fragment_header_t* header = (fragment_header_t*) buf;
diff --git a/src/erasurecode_postprocessing.c b/src/erasurecode_postprocessing.c
index f665e60..4affb67 100644
--- a/src/erasurecode_postprocessing.c
+++ b/src/erasurecode_postprocessing.c
@@ -34,6 +34,7 @@
 #include "erasurecode_stdinc.h"
 #include "alg_sig.h"
 
+__attribute__ ((visibility ("internal")))
 void add_fragment_metadata(ec_backend_t be, char *fragment,
         int idx, uint64_t orig_data_size, int blocksize,
         ec_checksum_type_t ct, int add_chksum)
@@ -70,6 +71,7 @@ void add_fragment_metadata(ec_backend_t be, char *fragment,
     }
 }
 
+__attribute__ ((visibility ("internal")))
 int finalize_fragments_after_encode(ec_backend_t instance,
         int k, int m, int blocksize, uint64_t orig_data_size,
         char **encoded_data, char **encoded_parity)
diff --git a/src/erasurecode_preprocessing.c b/src/erasurecode_preprocessing.c
index 57d13b5..aff4502 100644
--- a/src/erasurecode_preprocessing.c
+++ b/src/erasurecode_preprocessing.c
@@ -33,6 +33,7 @@
 #include "erasurecode_preprocessing.h"
 #include "erasurecode_stdinc.h"
 
+__attribute__ ((visibility ("internal")))
 int prepare_fragments_for_encode(ec_backend_t instance,
         int k, int m,
         const char *orig_data, uint64_t orig_data_size, /* input */
@@ -117,6 +118,7 @@ out_error:
  * case, the caller has to free up in the success case, so it may as well do
  * so in the failure case.
  */
+__attribute__ ((visibility ("internal")))
 int prepare_fragments_for_decode(
         int k, int m,
         char **data, char **parity,
@@ -277,6 +279,7 @@ int get_fragment_partition(
     return (num_missing > m) ? -EINSUFFFRAGS : 0;
 }
 
+__attribute__ ((visibility ("internal")))
 int fragments_to_string(int k, int m,
         char **fragments, int num_fragments,
         char **orig_payload, uint64_t *payload_len)
diff --git a/src/utils/chksum/alg_sig.c b/src/utils/chksum/alg_sig.c
index f8d0e39..c016dd8 100644
--- a/src/utils/chksum/alg_sig.c
+++ b/src/utils/chksum/alg_sig.c
@@ -213,6 +213,7 @@ alg_sig_t *init_alg_sig_w16(void *jerasure_sohandle, int sig_len)
     return alg_sig_handle;
 }
 
+__attribute__ ((visibility ("internal")))
 alg_sig_t *init_alg_sig(int sig_len, int gf_w)
 {
   int i=0;
@@ -243,6 +244,7 @@ alg_sig_t *init_alg_sig(int sig_len, int gf_w)
   return NULL;
 }
 
+__attribute__ ((visibility ("internal")))
 void destroy_alg_sig(alg_sig_t* alg_sig_handle)
 {
   if (alg_sig_handle == NULL) {
@@ -422,6 +424,7 @@ int compute_alg_sig_64(alg_sig_t *alg_sig_handle, char *buf, int len, char *sig)
   return -1;
 }
 
+__attribute__ ((visibility ("internal")))
 int compute_alg_sig(alg_sig_t *alg_sig_handle, char *buf, int len, char *sig)
 {
   if (alg_sig_handle->sig_len == 32) {