diff --git a/Makefile b/Makefile
index 4f76894..9d7cdba 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ NAME=bp
 CC=cc
 PREFIX=/usr/local
 SYSCONFDIR=/etc
-CFLAGS=-std=c99 -Werror -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -flto=auto
+CFLAGS=-std=c99 -Werror -D_XOPEN_SOURCE=700 -D_POSIX_C_SOURCE=200809L -flto=auto -fvisibility=hidden
 CWARN=-Wall -Wextra -Wno-format
   # -Wpedantic -Wsign-conversion -Wtype-limits -Wunused-result -Wnull-dereference \
 	# -Waggregate-return -Walloc-zero -Walloca -Warith-conversion -Wcast-align -Wcast-align=strict \
diff --git a/files.c b/files.c
index 54da573..afce285 100644
--- a/files.c
+++ b/files.c
@@ -42,7 +42,7 @@ static void populate_lines(file_t *f)
 // Read an entire file into memory, using a printf-style formatting string to
 // construct the filename.
 //
-file_t *load_filef(file_t **files, const char *fmt, ...)
+public file_t *load_filef(file_t **files, const char *fmt, ...)
 {
     char filename[PATH_MAX+1] = {'\0'};
     va_list args;
@@ -56,7 +56,7 @@ file_t *load_filef(file_t **files, const char *fmt, ...)
 //
 // Read an entire file into memory.
 //
-file_t *load_file(file_t **files, const char *filename)
+public file_t *load_file(file_t **files, const char *filename)
 {
     int fd = filename[0] == '\0' ? STDIN_FILENO : open(filename, O_RDONLY);
     if (fd < 0) {
@@ -125,7 +125,7 @@ file_t *load_file(file_t **files, const char *filename)
 //
 // Set a file struct to represent a region of a different file.
 //
-void slice_file(file_t *slice, file_t *src, const char *start, const char *end)
+public void slice_file(file_t *slice, file_t *src, const char *start, const char *end)
 {
     memset(slice, 0, sizeof(file_t));
     slice->filename = src->filename;
@@ -138,7 +138,7 @@ void slice_file(file_t *slice, file_t *src, const char *start, const char *end)
 //
 // Create a virtual file from a string.
 //
-file_t *spoof_file(file_t **files, const char *filename, const char *text, ssize_t _len)
+public file_t *spoof_file(file_t **files, const char *filename, const char *text, ssize_t _len)
 {
     if (filename == NULL) filename = "";
     file_t *f = new(file_t);
@@ -160,7 +160,7 @@ file_t *spoof_file(file_t **files, const char *filename, const char *text, ssize
 // Free a file and all memory contained inside its members, then set the input
 // pointer to NULL.
 //
-void destroy_file(file_t **at_f)
+public void destroy_file(file_t **at_f)
 {
     file_t *f = (file_t*)*at_f;
     if (f->filename)
@@ -184,7 +184,7 @@ void destroy_file(file_t **at_f)
 //
 // Given a pointer, determine which line number it points to.
 //
-size_t get_line_number(file_t *f, const char *p)
+public size_t get_line_number(file_t *f, const char *p)
 {
     if (f->nlines == 0) return 0;
     // Binary search:
@@ -204,7 +204,7 @@ size_t get_line_number(file_t *f, const char *p)
 //
 // Given a pointer, determine which line column it points to.
 //
-size_t get_line_column(file_t *f, const char *p)
+public size_t get_line_column(file_t *f, const char *p)
 {
     size_t line_no = get_line_number(f, p);
     return 1 + (size_t)(p - f->lines[line_no]);
@@ -213,7 +213,7 @@ size_t get_line_column(file_t *f, const char *p)
 //
 // Return a pointer to the line with the specified line number.
 //
-const char *get_line(file_t *f, size_t line_number)
+public const char *get_line(file_t *f, size_t line_number)
 {
     if (line_number == 0 || line_number > f->nlines) return NULL;
     return f->lines[line_number - 1];
diff --git a/json.c b/json.c
index 445f81b..448dbe7 100644
--- a/json.c
+++ b/json.c
@@ -5,6 +5,7 @@
 #include <stdio.h>
 
 #include "json.h"
+#include "utils.h"
 
 __attribute__((nonnull))
 static int _json_match(const char *text, match_t *m, int comma, bool verbose);
@@ -77,7 +78,7 @@ static int _json_match(const char *text, match_t *m, int comma, bool verbose)
 //
 // Print a match object as a JSON object.
 //
-void json_match(const char *text, match_t *m, bool verbose)
+public void json_match(const char *text, match_t *m, bool verbose)
 {
     (void)_json_match(text, m, 0, verbose);
 }
diff --git a/match.c b/match.c
index 20d485b..6336479 100644
--- a/match.c
+++ b/match.c
@@ -57,7 +57,7 @@ static void default_error_handler(char **msg) {
 
 static bp_errhand_t error_handler = default_error_handler;
 
-bp_errhand_t bp_set_error_handler(bp_errhand_t new_handler)
+public bp_errhand_t bp_set_error_handler(bp_errhand_t new_handler)
 {
     bp_errhand_t old_handler = error_handler;
     error_handler = new_handler;
@@ -817,7 +817,7 @@ match_t *new_match(pat_t *pat, const char *start, const char *end, match_t *chil
 // If the given match is not currently a child member of another match (or
 // otherwise reserved) then put it back in the pool of unused match objects.
 //
-void recycle_match(match_t **at_m)
+public void recycle_match(match_t **at_m)
 {
     match_t *m = *at_m;
     if (m->children) {
@@ -836,7 +836,7 @@ void recycle_match(match_t **at_m)
 //
 // Force all match objects into the pool of unused match objects.
 //
-size_t recycle_all_matches(void)
+public size_t recycle_all_matches(void)
 {
     size_t count = 0;
     for (match_t *m; (m = in_use_matches); ++count) {
@@ -851,7 +851,7 @@ size_t recycle_all_matches(void)
 //
 // Free all match objects in memory.
 //
-size_t free_all_matches(void)
+public size_t free_all_matches(void)
 {
     size_t count = 0;
     recycle_all_matches();
@@ -866,7 +866,7 @@ size_t free_all_matches(void)
 // Iterate over matches.
 // Usage: for (match_t *m = NULL; next_match(&m, ...); ) {...}
 //
-bool next_match(match_t **m, const char *start, const char *end, pat_t *pat, pat_t *defs, pat_t *skip, bool ignorecase)
+public bool next_match(match_t **m, const char *start, const char *end, pat_t *pat, pat_t *defs, pat_t *skip, bool ignorecase)
 {
     const char *pos;
     if (*m) {
@@ -937,7 +937,7 @@ static match_t *_get_numbered_capture(match_t *m, int *n)
 //
 // Get a specific numbered pattern capture.
 //
-match_t *get_numbered_capture(match_t *m, int n)
+public match_t *get_numbered_capture(match_t *m, int n)
 {
     if (n <= 0) return m;
     if (m->pat->type == BP_TAGGED || m->pat->type == BP_CAPTURE) {
@@ -979,7 +979,7 @@ match_t *_get_named_capture(match_t *m, const char *name, size_t namelen)
 //
 // Get a capture with a specific name.
 //
-match_t *get_named_capture(match_t *m, const char *name, ssize_t _namelen)
+public match_t *get_named_capture(match_t *m, const char *name, ssize_t _namelen)
 {
     size_t namelen = _namelen < 0 ? strlen(name) : (size_t)_namelen;
     if (m->pat->type == BP_TAGGED) {// || (m->pat->type == BP_CAPTURE && m->pat->args.capture.namelen > 0)) {
diff --git a/pattern.c b/pattern.c
index 61e6a5d..6c3484c 100644
--- a/pattern.c
+++ b/pattern.c
@@ -48,7 +48,7 @@ static inline void parse_err(const char *start, const char *end, const char *msg
 // Allocate a new pattern for this file (ensuring it will be automatically
 // freed when the file is freed)
 //
-pat_t *allocate_pat(pat_t pat)
+public pat_t *allocate_pat(pat_t pat)
 {
     static size_t next_pat_id = 1;
     pat_t *allocated = new(pat_t);
@@ -151,7 +151,7 @@ static pat_t *expand_choices(pat_t *first, const char *end, bool allow_nl)
 // Given two patterns, return a new pattern for the first pattern followed by
 // the second. If either pattern is NULL, return the other.
 //
-pat_t *chain_together(pat_t *first, pat_t *second)
+public pat_t *chain_together(pat_t *first, pat_t *second)
 {
     if (first == NULL) return second;
     if (second == NULL) return first;
@@ -169,7 +169,7 @@ pat_t *chain_together(pat_t *first, pat_t *second)
 // Given two patterns, return a new pattern for matching either the first
 // pattern or the second. If either pattern is NULL, return the other.
 //
-pat_t *either_pat(pat_t *first, pat_t *second)
+public pat_t *either_pat(pat_t *first, pat_t *second)
 {
     if (first == NULL) return second;
     if (second == NULL) return first;
@@ -498,7 +498,7 @@ static pat_t *_bp_simplepattern(const char *str, const char *end, bool inside_st
 // Similar to bp_simplepattern, except that the pattern begins with an implicit
 // '}' open quote that can be closed with '{'
 //
-maybe_pat_t bp_stringpattern(const char *str, const char *end)
+public maybe_pat_t bp_stringpattern(const char *str, const char *end)
 {
     __TRY_PATTERN__
     if (!end) end = str + strlen(str);
@@ -554,7 +554,7 @@ static pat_t *bp_simplepattern(const char *str, const char *end)
 // Given a pattern and a replacement string, compile the two into a BP
 // replace pattern.
 //
-maybe_pat_t bp_replacement(pat_t *replacepat, const char *replacement, const char *end)
+public maybe_pat_t bp_replacement(pat_t *replacepat, const char *replacement, const char *end)
 {
     const char *p = replacement;
     if (!end) end = replacement + strlen(replacement);
@@ -588,7 +588,7 @@ static pat_t *bp_pattern_nl(const char *str, const char *end, bool allow_nl)
 //
 // Return a new back reference to an existing match.
 //
-pat_t *bp_raw_literal(const char *str, size_t len)
+public pat_t *bp_raw_literal(const char *str, size_t len)
 {
     return Pattern(BP_STRING, str, &str[len], len, (ssize_t)len, .string=strndup(str, len));
 }
@@ -596,7 +596,7 @@ pat_t *bp_raw_literal(const char *str, size_t len)
 //
 // Compile a string representing a BP pattern into a pattern object.
 //
-maybe_pat_t bp_pattern(const char *str, const char *end)
+public maybe_pat_t bp_pattern(const char *str, const char *end)
 {
     str = after_spaces(str, true, end);
     if (!end) end = str + strlen(str);
@@ -611,7 +611,7 @@ maybe_pat_t bp_pattern(const char *str, const char *end)
         return (maybe_pat_t){.success = false, .value.error.start = str, .value.error.end = end, .value.error.msg = "Failed to parse this pattern"};
 }
 
-void free_all_pats(void)
+public void free_all_pats(void)
 {
     while (allocated_pats) {
         pat_t *tofree = allocated_pats;
@@ -620,7 +620,7 @@ void free_all_pats(void)
     }
 }
 
-void delete_pat(pat_t **at_pat, bool recursive)
+public void delete_pat(pat_t **at_pat, bool recursive)
 {
     pat_t *pat = *at_pat;
     if (!pat) return;
@@ -706,7 +706,7 @@ static int printf_pattern(FILE *stream, const struct printf_info *info, const vo
     }
 }
 
-int set_pattern_printf_specifier(char specifier)
+public int set_pattern_printf_specifier(char specifier)
 {
     return register_printf_specifier(specifier, printf_pattern, printf_pattern_size);
 }
diff --git a/printmatch.c b/printmatch.c
index aa2f1d5..8421a83 100644
--- a/printmatch.c
+++ b/printmatch.c
@@ -178,7 +178,7 @@ static void _explain_matches(match_node_t *firstmatch, int depth, const char *te
 //
 // Print a visualization of a match object.
 //
-void explain_match(match_t *m)
+public void explain_match(match_t *m)
 {
     printf("\033[?7l"); // Disable line wrapping
     match_node_t first = {.m = m};
@@ -196,7 +196,7 @@ static inline int fputc_safe(FILE *out, char c, print_options_t *opts)
     return printed;
 }
 
-int fprint_match(FILE *out, const char *file_start, match_t *m, print_options_t *opts)
+public int fprint_match(FILE *out, const char *file_start, match_t *m, print_options_t *opts)
 {
     int printed = 0;
     if (m->pat->type == BP_REPLACE) {
diff --git a/utf8.c b/utf8.c
index 08e8932..c5fc14b 100644
--- a/utf8.c
+++ b/utf8.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 
 #include "utf8.h"
+#include "utils.h"
 
 #define ARRAY_LEN(a) (sizeof(a)/sizeof((a)[0]))
 #define likely(x) __builtin_expect((x), 1)
@@ -182,7 +183,7 @@ static const uint32_t XID_Continue_only[][2] = {
 // Return the location of the next character or UTF8 codepoint.
 // (i.e. skip forward one codepoint at a time, not one byte at a time)
 //
-const char *next_char(const char *str, const char *end)
+public const char *next_char(const char *str, const char *end)
 {
     if (likely(str+1 <= end) && likely((str[0] & 0x80) == 0x0))
         return str+1;
@@ -199,7 +200,7 @@ const char *next_char(const char *str, const char *end)
 // Return the location of the previous character or UTF8 codepoint.
 // (i.e. skip backwards one codepoint at a time, not one byte at a time)
 //
-const char *prev_char(const char *start, const char *str)
+public const char *prev_char(const char *start, const char *str)
 {
     if (likely(str-1 >= start) && likely((str[-1] & 0x80) == 0x0))
         return str-1;
@@ -260,7 +261,7 @@ static bool find_in_ranges(uint32_t codepoint, const uint32_t ranges[][2], size_
     return false;
 }
 
-bool isidstart(const char *str, const char *end)
+public bool isidstart(const char *str, const char *end)
 {
     if (unlikely(str >= end)) return false;
     else if (isalpha(*str) || *str == '_') return true;
@@ -270,7 +271,7 @@ bool isidstart(const char *str, const char *end)
         && find_in_ranges(codepoint, XID_Start, ARRAY_LEN(XID_Start));
 }
 
-bool isidcontinue(const char *str, const char *end)
+public bool isidcontinue(const char *str, const char *end)
 {
     if (unlikely(str >= end)) return false;
     else if (isalnum(*str) || *str == '_') return true;
diff --git a/utils.c b/utils.c
index edf0176..78b0a25 100644
--- a/utils.c
+++ b/utils.c
@@ -15,7 +15,7 @@
 // Helper function to skip past all spaces (and comments)
 // Returns a pointer to the first non-space character.
 //
-const char *after_spaces(const char *str, bool skip_nl, const char *end)
+public const char *after_spaces(const char *str, bool skip_nl, const char *end)
 {
     // Skip whitespace and comments:
   skip_whitespace:
@@ -41,7 +41,7 @@ const char *after_spaces(const char *str, bool skip_nl, const char *end)
 // Return the first character after a valid BP name, or NULL if none is
 // found.
 //
-const char *after_name(const char *str, const char *end)
+public const char *after_name(const char *str, const char *end)
 {
     if (str >= end) return end;
     if (*str == '|') return &str[1];
@@ -59,7 +59,7 @@ const char *after_name(const char *str, const char *end)
 //
 // Check if a character is found and if so, move past it.
 //
-bool matchchar(const char **str, char c, bool skip_nl, const char *end)
+public bool matchchar(const char **str, char c, bool skip_nl, const char *end)
 {
     const char *next = after_spaces(*str, skip_nl, end);
     if (next >= end) return false;
@@ -73,7 +73,7 @@ bool matchchar(const char **str, char c, bool skip_nl, const char *end)
 //
 // Check if a string is found and if so, move past it.
 //
-bool matchstr(const char **str, const char *target, bool skip_nl, const char *end)
+public bool matchstr(const char **str, const char *target, bool skip_nl, const char *end)
 {
     const char *next = after_spaces(*str, skip_nl, end);
     if (next + strlen(target) > end) return false;
@@ -89,7 +89,7 @@ bool matchstr(const char **str, const char *target, bool skip_nl, const char *en
 // character that was escaped.
 // Set *end = the first character past the end of the escape sequence.
 //
-char unescapechar(const char *escaped, const char **after, const char *end)
+public char unescapechar(const char *escaped, const char **after, const char *end)
 {
     size_t len = 0;
     unsigned char ret = '\\';
@@ -144,7 +144,7 @@ char unescapechar(const char *escaped, const char **after, const char *end)
 //
 // Free memory, but also set the pointer to NULL for safety
 //
-void delete(void *p)
+public void delete(void *p)
 {
     if (*(void**)p == NULL)
         errx(EXIT_FAILURE, "attempt to free(NULL)");
diff --git a/utils.h b/utils.h
index 1819c75..628492e 100644
--- a/utils.h
+++ b/utils.h
@@ -20,6 +20,10 @@
     __expr; \
 })
 
+#ifndef public
+#define public __attribute__ ((visibility ("default")))
+#endif
+
 #define new(t) require(calloc(1, sizeof(t)), "`new(" #t ")` allocation failure")
 #define checked_strdup(s) require(strdup(s), "`checked_strdup(" #s ")` allocation failure")
 #define grow(arr,n) require(realloc(arr,sizeof(arr[0])*(n)), "`grow(" #arr ", " #n ")` allocation failure")