commit 76c197bbba8474e153870f758a017f2c5f9e2f78
Author: Yury Usishchev <address@hidden>
Date:   Thu Feb 11 17:26:25 2016 +0300

    add visibility("default") for api functions

diff --git a/include/acl.h b/include/acl.h
index e3347e1..34abfd6 100644
--- a/include/acl.h
+++ b/include/acl.h
@@ -27,6 +27,17 @@
 extern "C" {
 #endif
 
+/* Define for visibility */
+#if defined _WIN32 || defined __CYGWIN__
+ #define API_EXPORT
+#else
+ #if __GNUC__ >= 4
+  #define API_EXPORT __attribute__ ((visibility ("default")))
+ #else
+  #define API_EXPORT
+ #endif
+#endif
+
 /*=== Data types ===*/
 
 struct __acl_ext;
@@ -77,50 +88,50 @@ typedef struct __acl_permset_ext *acl_permset_t;
 
 /*=== ACL manipulation ===*/
 
-extern acl_t acl_init(int count);
-extern acl_t acl_dup(acl_t acl);
-extern int acl_free(void *obj_p);
-extern int acl_valid(acl_t acl);
+API_EXPORT extern acl_t acl_init(int count);
+API_EXPORT extern acl_t acl_dup(acl_t acl);
+API_EXPORT extern int acl_free(void *obj_p);
+API_EXPORT extern int acl_valid(acl_t acl);
 
 /*=== Entry manipulation ===*/
 
-extern int
+API_EXPORT extern int
 acl_copy_entry(acl_entry_t dest_d, acl_entry_t src_d);
-extern int acl_create_entry(acl_t *acl_p, acl_entry_t *entry_p);
-extern int acl_delete_entry(acl_t acl, acl_entry_t entry_d);
-extern int acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p);
+API_EXPORT extern int acl_create_entry(acl_t *acl_p, acl_entry_t *entry_p);
+API_EXPORT extern int acl_delete_entry(acl_t acl, acl_entry_t entry_d);
+API_EXPORT extern int acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p);
 
 /* Manipulate ACL entry permissions */
 
-extern int acl_add_perm(acl_permset_t permset_d, acl_perm_t perm);
-extern int acl_calc_mask(acl_t *acl_p);
-extern int acl_clear_perms(acl_permset_t permset_d);
-extern int acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm);
-extern int acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p);
-extern int acl_set_permset(acl_entry_t entry_d, acl_permset_t permset_d);
+API_EXPORT extern int acl_add_perm(acl_permset_t permset_d, acl_perm_t perm);
+API_EXPORT extern int acl_calc_mask(acl_t *acl_p);
+API_EXPORT extern int acl_clear_perms(acl_permset_t permset_d);
+API_EXPORT extern int acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm);
+API_EXPORT extern int acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p);
+API_EXPORT extern int acl_set_permset(acl_entry_t entry_d, acl_permset_t permset_d);
 
 /* Manipulate ACL entry tag type and qualifier */
 
-extern void * acl_get_qualifier(acl_entry_t entry_d);
-extern int acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p);
-extern int acl_set_qualifier(acl_entry_t entry_d, const void *tag_qualifier_p);
-extern int acl_set_tag_type(acl_entry_t entry_d, acl_tag_t tag_type);
+API_EXPORT extern void * acl_get_qualifier(acl_entry_t entry_d);
+API_EXPORT extern int acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p);
+API_EXPORT extern int acl_set_qualifier(acl_entry_t entry_d, const void *tag_qualifier_p);
+API_EXPORT extern int acl_set_tag_type(acl_entry_t entry_d, acl_tag_t tag_type);
 
 /*=== Format translation ===*/
 
-extern ssize_t acl_copy_ext(void *buf_p, acl_t acl, ssize_t size);
-extern acl_t acl_copy_int(const void *buf_p);
-extern acl_t acl_from_text(const char *buf_p);
-extern ssize_t acl_size(acl_t acl);
-extern char *acl_to_text(acl_t acl, ssize_t *len_p);
+API_EXPORT extern ssize_t acl_copy_ext(void *buf_p, acl_t acl, ssize_t size);
+API_EXPORT extern acl_t acl_copy_int(const void *buf_p);
+API_EXPORT extern acl_t acl_from_text(const char *buf_p);
+API_EXPORT extern ssize_t acl_size(acl_t acl);
+API_EXPORT extern char *acl_to_text(acl_t acl, ssize_t *len_p);
 
 /*=== Object manipulation ===*/
 
-extern int acl_delete_def_file(const char *path_p);
-extern acl_t acl_get_fd(int fd);
-extern acl_t acl_get_file(const char *path_p, acl_type_t type);
-extern int acl_set_fd(int fd, acl_t acl);
-extern int acl_set_file(const char *path_p, acl_type_t type, acl_t acl);
+API_EXPORT extern int acl_delete_def_file(const char *path_p);
+API_EXPORT extern acl_t acl_get_fd(int fd);
+API_EXPORT extern acl_t acl_get_file(const char *path_p, acl_type_t type);
+API_EXPORT extern int acl_set_fd(int fd, acl_t acl);
+API_EXPORT extern int acl_set_file(const char *path_p, acl_type_t type, acl_t acl);
 
 #ifdef __cplusplus
 }
diff --git a/include/libacl.h b/include/libacl.h
index d6a6650..bfced13 100644
--- a/include/libacl.h
+++ b/include/libacl.h
@@ -26,6 +26,17 @@
 extern "C" {
 #endif
 
+/* Define for visibility */
+#if defined _WIN32 || defined __CYGWIN__
+ #define API_EXPORT
+#else
+ #if __GNUC__ >= 4
+  #define API_EXPORT __attribute__ ((visibility ("default")))
+ #else
+  #define API_EXPORT
+ #endif
+#endif
+
 /* Flags for acl_to_any_text() */
 
 /* Print NO, SOME or ALL effective permissions comments. SOME prints
@@ -52,24 +63,24 @@ extern "C" {
 #define ACL_MISS_ERROR		(0x3000)     /* missing required entry */
 #define ACL_ENTRY_ERROR		(0x4000)     /* wrong entry type */
 
-extern char *acl_to_any_text(acl_t acl, const char *prefix,
+API_EXPORT extern char *acl_to_any_text(acl_t acl, const char *prefix,
 			     char separator, int options);
-extern int acl_cmp(acl_t acl1, acl_t acl2);
-extern int acl_check(acl_t acl, int *last);
-extern acl_t acl_from_mode(mode_t mode);
-extern int acl_equiv_mode(acl_t acl, mode_t *mode_p);
-int acl_extended_file(const char *path_p);
-int acl_extended_file_nofollow(const char *path_p);
-int acl_extended_fd(int fd);
-extern int acl_entries(acl_t acl);
-extern const char *acl_error(int code);
-extern int acl_get_perm(acl_permset_t permset_d, acl_perm_t perm);
+API_EXPORT extern int acl_cmp(acl_t acl1, acl_t acl2);
+API_EXPORT extern int acl_check(acl_t acl, int *last);
+API_EXPORT extern acl_t acl_from_mode(mode_t mode);
+API_EXPORT extern int acl_equiv_mode(acl_t acl, mode_t *mode_p);
+API_EXPORT int acl_extended_file(const char *path_p);
+API_EXPORT int acl_extended_file_nofollow(const char *path_p);
+API_EXPORT int acl_extended_fd(int fd);
+API_EXPORT extern int acl_entries(acl_t acl);
+API_EXPORT extern const char *acl_error(int code);
+API_EXPORT extern int acl_get_perm(acl_permset_t permset_d, acl_perm_t perm);
 
 /* Copying permissions between files */
 struct error_context;
-extern int perm_copy_file (const char *, const char *,
+API_EXPORT extern int perm_copy_file (const char *, const char *,
 			    struct error_context *);
-extern int perm_copy_fd (const char *, int, const char *, int,
+API_EXPORT extern int perm_copy_fd (const char *, int, const char *, int,
 			  struct error_context *);
 
 #ifdef __cplusplus
diff --git a/libacl/acl_add_perm.c b/libacl/acl_add_perm.c
index 58ce7f5..8ae3fec 100644
--- a/libacl/acl_add_perm.c
+++ b/libacl/acl_add_perm.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.1 */
-int
+API_EXPORT int
 acl_add_perm(acl_permset_t permset_d, acl_perm_t perm)
 {
 	acl_permset_obj *acl_permset_obj_p = ext2int(acl_permset, permset_d);
diff --git a/libacl/acl_calc_mask.c b/libacl/acl_calc_mask.c
index b2ec91a..243436c 100644
--- a/libacl/acl_calc_mask.c
+++ b/libacl/acl_calc_mask.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.2 */
-int
+API_EXPORT int
 acl_calc_mask(acl_t *acl_p)
 {
 	acl_obj *acl_obj_p;
diff --git a/libacl/acl_check.c b/libacl/acl_check.c
index ebbc050..0268b99 100644
--- a/libacl/acl_check.c
+++ b/libacl/acl_check.c
@@ -40,7 +40,7 @@
   	0 on success, -1 on error, or an ACL_*_ERROR value for invalid ACLs.
 */
 
-int
+API_EXPORT int
 acl_check(acl_t acl, int *last)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_clear_perms.c b/libacl/acl_clear_perms.c
index 106e2d1..53b1d64 100644
--- a/libacl/acl_clear_perms.c
+++ b/libacl/acl_clear_perms.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.3 */
-int
+API_EXPORT int
 acl_clear_perms(acl_permset_t permset_d)
 {
 	acl_permset_obj *acl_permset_obj_p = ext2int(acl_permset, permset_d);
diff --git a/libacl/acl_cmp.c b/libacl/acl_cmp.c
index ae42284..96a26c1 100644
--- a/libacl/acl_cmp.c
+++ b/libacl/acl_cmp.c
@@ -22,7 +22,7 @@
 #include "libacl.h"
 
 
-int
+API_EXPORT int
 acl_cmp(acl_t acl1, acl_t acl2)
 {
 	acl_obj *acl1_obj_p = ext2int(acl, acl1),
diff --git a/libacl/acl_copy_entry.c b/libacl/acl_copy_entry.c
index 85cebc8..16f6c9b 100644
--- a/libacl/acl_copy_entry.c
+++ b/libacl/acl_copy_entry.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.4 */
-int
+API_EXPORT int
 acl_copy_entry(acl_entry_t dest_d, acl_entry_t src_d)
 {
 	acl_entry_obj *dest_p = ext2int(acl_entry, dest_d),
diff --git a/libacl/acl_copy_ext.c b/libacl/acl_copy_ext.c
index 7f51185..e1a26ba 100644
--- a/libacl/acl_copy_ext.c
+++ b/libacl/acl_copy_ext.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.5 */
-ssize_t
+API_EXPORT ssize_t
 acl_copy_ext(void *buf_p, acl_t acl, ssize_t size)
 {
 	struct __acl *acl_ext = (struct __acl *)buf_p;
diff --git a/libacl/acl_copy_int.c b/libacl/acl_copy_int.c
index 7bcb0c9..63c0d3f 100644
--- a/libacl/acl_copy_int.c
+++ b/libacl/acl_copy_int.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.6 */
-acl_t
+API_EXPORT acl_t
 acl_copy_int(const void *buf_p)
 {
 	const struct __acl *ext_acl = (struct __acl *)buf_p;
diff --git a/libacl/acl_create_entry.c b/libacl/acl_create_entry.c
index a1c4908..286a0cd 100644
--- a/libacl/acl_create_entry.c
+++ b/libacl/acl_create_entry.c
@@ -50,7 +50,7 @@ __acl_create_entry_obj(acl_obj *acl_obj_p)
 }
 
 /* 23.4.7 */
-int
+API_EXPORT int
 acl_create_entry(acl_t *acl_p, acl_entry_t *entry_p)
 {
 	acl_obj *acl_obj_p;
diff --git a/libacl/acl_delete_def_file.c b/libacl/acl_delete_def_file.c
index 845940c..80c7bc8 100644
--- a/libacl/acl_delete_def_file.c
+++ b/libacl/acl_delete_def_file.c
@@ -27,7 +27,7 @@
 #include "libacl.h"
 
 /* 23.4.8 */
-int
+API_EXPORT int
 acl_delete_def_file(const char *path_p)
 {
 	int error;
diff --git a/libacl/acl_delete_entry.c b/libacl/acl_delete_entry.c
index a1ae6db..a8525c7 100644
--- a/libacl/acl_delete_entry.c
+++ b/libacl/acl_delete_entry.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.9 */
-int
+API_EXPORT int
 acl_delete_entry(acl_t acl, acl_entry_t entry_d)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_delete_perm.c b/libacl/acl_delete_perm.c
index 0dcb36e..e9ce3ae 100644
--- a/libacl/acl_delete_perm.c
+++ b/libacl/acl_delete_perm.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.10 */
-int
+API_EXPORT int
 acl_delete_perm(acl_permset_t permset_d, acl_perm_t perm)
 {
 	acl_permset_obj *acl_permset_obj_p = ext2int(acl_permset, permset_d);
diff --git a/libacl/acl_dup.c b/libacl/acl_dup.c
index cb73cee..43a7c28 100644
--- a/libacl/acl_dup.c
+++ b/libacl/acl_dup.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.11 */
-acl_t
+API_EXPORT acl_t
 acl_dup(acl_t acl)
 {
 	acl_entry_obj *entry_obj_p, *dup_entry_obj_p;
diff --git a/libacl/acl_entries.c b/libacl/acl_entries.c
index fc4dcbf..6b3dea2 100644
--- a/libacl/acl_entries.c
+++ b/libacl/acl_entries.c
@@ -22,7 +22,7 @@
 #include "libacl.h"
 
 
-int
+API_EXPORT int
 acl_entries(acl_t acl)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_equiv_mode.c b/libacl/acl_equiv_mode.c
index b4c6de3..f099978 100644
--- a/libacl/acl_equiv_mode.c
+++ b/libacl/acl_equiv_mode.c
@@ -26,7 +26,7 @@
 #include "libacl.h"
 
 
-int
+API_EXPORT int
 acl_equiv_mode(acl_t acl, mode_t *mode_p)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_error.c b/libacl/acl_error.c
index 8a361b0..d739a57 100644
--- a/libacl/acl_error.c
+++ b/libacl/acl_error.c
@@ -26,7 +26,7 @@
 #include "config.h"
 
 
-const char *
+API_EXPORT const char *
 acl_error(int code)
 {
 	switch(code) {
diff --git a/libacl/acl_extended_fd.c b/libacl/acl_extended_fd.c
index bbf9055..9c8bca7 100644
--- a/libacl/acl_extended_fd.c
+++ b/libacl/acl_extended_fd.c
@@ -26,7 +26,7 @@
 #include "byteorder.h"
 #include "acl_ea.h"
 
-int
+API_EXPORT int
 acl_extended_fd(int fd)
 {
 	int base_size = sizeof(acl_ea_header) + 3 * sizeof(acl_ea_entry);
diff --git a/libacl/acl_extended_file.c b/libacl/acl_extended_file.c
index 87f8e6e..29d0730 100644
--- a/libacl/acl_extended_file.c
+++ b/libacl/acl_extended_file.c
@@ -26,7 +26,7 @@
 #include "__acl_extended_file.h"
 
 
-int
+API_EXPORT int
 acl_extended_file(const char *path_p)
 {
 	return __acl_extended_file(path_p, getxattr);
diff --git a/libacl/acl_extended_file_nofollow.c b/libacl/acl_extended_file_nofollow.c
index a15b076..a5b4fd3 100644
--- a/libacl/acl_extended_file_nofollow.c
+++ b/libacl/acl_extended_file_nofollow.c
@@ -26,7 +26,7 @@
 #include "__acl_extended_file.h"
 
 
-int
+API_EXPORT int
 acl_extended_file_nofollow(const char *path_p)
 {
 	return __acl_extended_file(path_p, lgetxattr);
diff --git a/libacl/acl_free.c b/libacl/acl_free.c
index 8510bbf..1bac441 100644
--- a/libacl/acl_free.c
+++ b/libacl/acl_free.c
@@ -37,7 +37,7 @@ __acl_free_acl_obj(acl_obj *acl_obj_p)
 
 
 /* 23.4.12 */
-int
+API_EXPORT int
 acl_free(void *obj_p)
 {
 	obj_prefix *int_p = ((obj_prefix *)obj_p)-1;
diff --git a/libacl/acl_from_mode.c b/libacl/acl_from_mode.c
index 93dc689..f49e2d6 100644
--- a/libacl/acl_from_mode.c
+++ b/libacl/acl_from_mode.c
@@ -34,7 +34,7 @@
   	the new ACL.
 */
 
-acl_t
+API_EXPORT acl_t
 acl_from_mode(mode_t mode)
 {
 	acl_obj *acl_obj_p;
diff --git a/libacl/acl_from_text.c b/libacl/acl_from_text.c
index 83a4d21..9eb8b20 100644
--- a/libacl/acl_from_text.c
+++ b/libacl/acl_from_text.c
@@ -40,7 +40,7 @@ static int parse_acl_entry(const char **text_p, acl_t *acl_p);
 
 
 /* 23.4.13 */
-acl_t
+API_EXPORT acl_t
 acl_from_text(const char *buf_p)
 {
 	acl_t acl;
diff --git a/libacl/acl_get_entry.c b/libacl/acl_get_entry.c
index 2a0de66..1c8d20c 100644
--- a/libacl/acl_get_entry.c
+++ b/libacl/acl_get_entry.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.14 */
-int
+API_EXPORT int
 acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_get_fd.c b/libacl/acl_get_fd.c
index 15e3880..3b8b1af 100644
--- a/libacl/acl_get_fd.c
+++ b/libacl/acl_get_fd.c
@@ -32,7 +32,7 @@
 #include "acl_ea.h"
 
 /* 23.4.15 */
-acl_t
+API_EXPORT acl_t
 acl_get_fd(int fd)
 {
 	const size_t size_guess = acl_ea_size(16);
diff --git a/libacl/acl_get_file.c b/libacl/acl_get_file.c
index d3131bc..61aa350 100644
--- a/libacl/acl_get_file.c
+++ b/libacl/acl_get_file.c
@@ -32,7 +32,7 @@
 #include "acl_ea.h"
 
 /* 23.4.16 */
-acl_t
+API_EXPORT acl_t
 acl_get_file(const char *path_p, acl_type_t type)
 {
 	const size_t size_guess = acl_ea_size(16);
diff --git a/libacl/acl_get_perm.c b/libacl/acl_get_perm.c
index 31357b2..caffa62 100644
--- a/libacl/acl_get_perm.c
+++ b/libacl/acl_get_perm.c
@@ -22,7 +22,7 @@
 #include "libacl.h"
 
 
-int
+API_EXPORT int
 acl_get_perm(acl_permset_t permset_d, acl_perm_t perm)
 {
 	acl_permset_obj *acl_permset_obj_p = ext2int(acl_permset, permset_d);
diff --git a/libacl/acl_get_permset.c b/libacl/acl_get_permset.c
index 85749f2..24ea896 100644
--- a/libacl/acl_get_permset.c
+++ b/libacl/acl_get_permset.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.17 */
-int
+API_EXPORT int
 acl_get_permset(acl_entry_t entry_d, acl_permset_t *permset_p)
 {
 	acl_entry_obj *entry_obj_p = ext2int(acl_entry, entry_d);
diff --git a/libacl/acl_get_qualifier.c b/libacl/acl_get_qualifier.c
index 0961acf..fcf71ca 100644
--- a/libacl/acl_get_qualifier.c
+++ b/libacl/acl_get_qualifier.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.18 */
-void *
+API_EXPORT void *
 acl_get_qualifier(acl_entry_t entry_d)
 {
 	acl_entry_obj *entry_obj_p = ext2int(acl_entry, entry_d);
diff --git a/libacl/acl_get_tag_type.c b/libacl/acl_get_tag_type.c
index 3075178..b559cc1 100644
--- a/libacl/acl_get_tag_type.c
+++ b/libacl/acl_get_tag_type.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.19 */
-int
+API_EXPORT int
 acl_get_tag_type(acl_entry_t entry_d, acl_tag_t *tag_type_p)
 {
 	acl_entry_obj *entry_obj_p = ext2int(acl_entry, entry_d);
diff --git a/libacl/acl_init.c b/libacl/acl_init.c
index 5880c10..c3eb541 100644
--- a/libacl/acl_init.c
+++ b/libacl/acl_init.c
@@ -55,7 +55,7 @@ __acl_init_obj(int count)
 
 
 /* 23.4.20 */
-acl_t
+API_EXPORT acl_t
 acl_init(int count)
 {
 	acl_obj *obj;
diff --git a/libacl/acl_set_fd.c b/libacl/acl_set_fd.c
index 38dcd4a..8943e80 100644
--- a/libacl/acl_set_fd.c
+++ b/libacl/acl_set_fd.c
@@ -29,7 +29,7 @@
 
 
 /* 23.4.21 */
-int
+API_EXPORT int
 acl_set_fd(int fd, acl_t acl)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_set_file.c b/libacl/acl_set_file.c
index c234b4a..3ab4b51 100644
--- a/libacl/acl_set_file.c
+++ b/libacl/acl_set_file.c
@@ -31,7 +31,7 @@
 
 
 /* 23.4.22 */
-int
+API_EXPORT int
 acl_set_file(const char *path_p, acl_type_t type, acl_t acl)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_set_permset.c b/libacl/acl_set_permset.c
index 67bb520..b2a7282 100644
--- a/libacl/acl_set_permset.c
+++ b/libacl/acl_set_permset.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.23 */
-int
+API_EXPORT int
 acl_set_permset(acl_entry_t entry_d, acl_permset_t permset_d)
 {
 	acl_entry_obj *entry_obj_p = ext2int(acl_entry, entry_d);
diff --git a/libacl/acl_set_qualifier.c b/libacl/acl_set_qualifier.c
index 59e86ff..c14c772 100644
--- a/libacl/acl_set_qualifier.c
+++ b/libacl/acl_set_qualifier.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.24 */
-int
+API_EXPORT int
 acl_set_qualifier(acl_entry_t entry_d, const void *tag_qualifier_p)
 {
 	acl_entry_obj *entry_obj_p = ext2int(acl_entry, entry_d);
diff --git a/libacl/acl_set_tag_type.c b/libacl/acl_set_tag_type.c
index d2f2d67..d4d7d5e 100644
--- a/libacl/acl_set_tag_type.c
+++ b/libacl/acl_set_tag_type.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.25 */
-int
+API_EXPORT int
 acl_set_tag_type(acl_entry_t entry_d, acl_tag_t tag_type)
 {
 	acl_entry_obj *entry_obj_p = ext2int(acl_entry, entry_d);
diff --git a/libacl/acl_size.c b/libacl/acl_size.c
index 20aa692..12ad75e 100644
--- a/libacl/acl_size.c
+++ b/libacl/acl_size.c
@@ -23,7 +23,7 @@
 
 
 /* 23.4.26 */
-ssize_t
+API_EXPORT ssize_t
 acl_size(acl_t acl)
 {
 	acl_obj *acl_obj_p = ext2int(acl, acl);
diff --git a/libacl/acl_to_any_text.c b/libacl/acl_to_any_text.c
index 0d12539..0e3e327 100644
--- a/libacl/acl_to_any_text.c
+++ b/libacl/acl_to_any_text.c
@@ -27,7 +27,7 @@
 #include <acl/libacl.h>
 #include "libacl.h"
 
-char *
+API_EXPORT char *
 acl_to_any_text(acl_t acl, const char *prefix, char separator, int options)
 {
 	return __acl_to_any_text(acl, NULL, prefix, separator, NULL, options);
diff --git a/libacl/acl_to_text.c b/libacl/acl_to_text.c
index 1285b55..b77b072 100644
--- a/libacl/acl_to_text.c
+++ b/libacl/acl_to_text.c
@@ -24,7 +24,7 @@
 #include <acl/libacl.h>
 #include "libacl.h"
 
-char *
+API_EXPORT char *
 acl_to_text(acl_t acl, ssize_t *len_p)
 {
 	return __acl_to_any_text(acl, len_p, NULL, '\n', "\n",
diff --git a/libacl/acl_valid.c b/libacl/acl_valid.c
index 2dda372..3449c26 100644
--- a/libacl/acl_valid.c
+++ b/libacl/acl_valid.c
@@ -25,7 +25,7 @@
 
 
 /* 23.4.28 */
-int
+API_EXPORT int
 acl_valid(acl_t acl)
 {
 	int result;
diff --git a/libacl/libacl.h b/libacl/libacl.h
index 08ba905..b556350 100644
--- a/libacl/libacl.h
+++ b/libacl/libacl.h
@@ -24,6 +24,17 @@
 # define ENOATTR ENODATA
 #endif
 
+/* Define for visibility */
+#if defined _WIN32 || defined __CYGWIN__
+ #define API_EXPORT
+#else
+ #if __GNUC__ >= 4
+  #define API_EXPORT __attribute__ ((visibility ("default")))
+ #else
+  #define API_EXPORT
+ #endif
+#endif
+
 typedef unsigned int permset_t;
 
 #define ACL_PERM_NONE		(0x0000)
diff --git a/libacl/perm_copy_fd.c b/libacl/perm_copy_fd.c
index f9ae690..4b37d9f 100644
--- a/libacl/perm_copy_fd.c
+++ b/libacl/perm_copy_fd.c
@@ -142,7 +142,7 @@ chmod_only:
 /* Copy the permissions of src_path to dst_path. This includes the
    file mode permission bits and ACLs. File ownership is not copied.
  */
-int
+API_EXPORT int
 perm_copy_fd (const char *src_path, int src_fd,
 	       const char *dst_path, int dst_fd,
 	       struct error_context *ctx)
diff --git a/libacl/perm_copy_file.c b/libacl/perm_copy_file.c
index 023294d..9b79b47 100644
--- a/libacl/perm_copy_file.c
+++ b/libacl/perm_copy_file.c
@@ -156,7 +156,7 @@ chmod_only:
 /* Copy the permissions of src_path to dst_path. This includes the
    file mode permission bits and ACLs. File ownership is not copied.
  */
-int
+API_EXPORT int
 perm_copy_file (const char *src_path, const char *dst_path,
 		 struct error_context *ctx)
 {