diff --git a/include/libpsl-inline.h b/include/libpsl-inline.h
index d9997a6..6012395 100644
--- a/include/libpsl-inline.h
+++ b/include/libpsl-inline.h
@@ -62,6 +62,16 @@ int
 int
 	psl_inline_suffix_exception_count(void);
 
+// returns compilation time
+time_t
+	psl_inline_builtin_compile_time(void);
+// returns mtime of PSL source file
+time_t
+	psl_inline_builtin_file_time(void);
+// returns MD5 checksum of PSL source file
+const char *
+	psl_inline_builtin_md5sum(void);
+
 PSL_END_DECLS
 
 #endif /* _LIBPSL_LIBPSL_INLINE_H */
diff --git a/src/Makefile.am b/src/Makefile.am
index bbd54e0..db0a7db 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -27,4 +27,4 @@ psl2c_LDADD = -lidn2
 
 # Build rule for suffix.c
 suffixes.c: $(top_srcdir)/data/effective_tld_names.dat psl2c$(EXEEXT)
-	./psl2c$(EXEEXT) <$(top_srcdir)/data/effective_tld_names.dat >suffixes.c
+	./psl2c$(EXEEXT) $(top_srcdir)/data/effective_tld_names.dat suffixes.c
diff --git a/src/psl-inline.c b/src/psl-inline.c
index 901c57d..3002e08 100644
--- a/src/psl-inline.c
+++ b/src/psl-inline.c
@@ -24,11 +24,6 @@
  *
  */
 
-// need _GNU_SOURCE for qsort_r()
-#ifndef _GNU_SOURCE
-#	define _GNU_SOURCE
-#endif
-
 #if HAVE_CONFIG_H
 # include <config.h>
 #endif
@@ -151,3 +146,21 @@ int psl_inline_suffix_exception_count(void)
 {
 	return countof(suffix_exceptions);
 }
+
+// returns compilation time
+time_t psl_inline_builtin_compile_time(void)
+{
+	return _psl_compile_time;
+}
+
+// returns mtime of PSL source file
+time_t psl_inline_builtin_file_time(void)
+{
+	return _psl_file_time;
+}
+
+// returns MD5 checksum of PSL source file
+const char *psl_inline_builtin_md5sum(void)
+{
+	return _psl_md5_checksum;
+}
diff --git a/src/psl2c.c b/src/psl2c.c
index 6fbb785..8c9ce0d 100644
--- a/src/psl2c.c
+++ b/src/psl2c.c
@@ -28,27 +28,31 @@
 # include <config.h>
 #endif
 
+#include <stdio.h>
+#include <time.h>
+#include <sys/stat.h>
+
 //#ifdef WITH_LIBIDN2
 #	include <idn2.h>
 //#endif
 
 #include "psl.c"
 
-static void _print_psl_entries(_psl_vector_t *v, const char *varname)
+static void _print_psl_entries(FILE *fpout, const _psl_vector_t *v, const char *varname)
 {
 	int it;
 
-	printf("// automatically generated by psl2c\n");
-	printf("static _psl_entry_t %s[] = {\n", varname);
+	fprintf(fpout, "// automatically generated by psl2c\n");
+	fprintf(fpout, "static _psl_entry_t %s[] = {\n", varname);
 
 	for (it = 0; it < v->cur; it++) {
 		_psl_entry_t *e = _vector_get(v, it);
 
-		printf("\t{ \"%s\", NULL, %hd, %hhd, %hhd },\n",
+		fprintf(fpout, "\t{ \"%s\", NULL, %hd, %hhd, %hhd },\n",
 			e->label_buf, e->length, e->nlabels, e->wildcard);
 	}
 
-	printf("};\n");
+	fprintf(fpout, "};\n");
 }
 
 static int _str_needs_encoding(const char *s)
@@ -83,20 +87,53 @@ static void _add_punycode_if_needed(_psl_vector_t *v)
 	_vector_sort(v);
 }
 
-// int main(int argc, const char **argv)
-int main(void)
+int main(int argc, const char **argv)
 {
+	FILE *fpout;
 	psl_ctx_t *psl;
+	int ret = 0;
 
-	if (!(psl = psl_load_fp(stdin)))
+	if (argc != 3) {
+		fprintf(stderr, "Usage: psl2c <infile> <outfile>\n");
+		fprintf(stderr, "  <infile>  is the 'effective_tld_names.dat' (aka Public Suffix List)\n");
+		fprintf(stderr, "  <outfile> is the the C filename to be generated from <infile>\n");
 		return 1;
+	}
 
-	_add_punycode_if_needed(psl->suffixes);
-	_add_punycode_if_needed(psl->suffix_exceptions);
+	if (!(psl = psl_load_file(argv[1])))
+		return 2;
 
-	_print_psl_entries(psl->suffixes, "suffixes");
-	_print_psl_entries(psl->suffix_exceptions, "suffix_exceptions");
+	if ((fpout = fopen(argv[2], "w"))) {
+		FILE *pp;
+		struct stat st;
+		char cmd[16 + strlen(argv[1])], checksum[64] = "";
+
+		_add_punycode_if_needed(psl->suffixes);
+		_add_punycode_if_needed(psl->suffix_exceptions);
+
+		_print_psl_entries(fpout, psl->suffixes, "suffixes");
+		_print_psl_entries(fpout, psl->suffix_exceptions, "suffix_exceptions");
+
+		snprintf(cmd, sizeof(cmd), "md5sum %s", argv[1]);
+		if ((pp = popen(cmd, "r"))) {
+			if (fscanf(pp, "%63[0-9a-zA-Z]", checksum) < 1)
+				*checksum = 0;
+			pclose(pp);
+		}
+
+		if (stat(argv[1], &st) != 0)
+			st.st_mtime = 0;
+		fprintf(fpout, "static time_t _psl_file_time = %lu;\n", st.st_mtime);
+		fprintf(fpout, "static time_t _psl_compile_time = %lu;\n", time(NULL));
+		fprintf(fpout, "static char _psl_md5_checksum[] = \"%s\";\n", checksum);
+
+		if (fclose(fpout) != 0)
+			ret = 4;
+	} else {
+		fprintf(stderr, "Failed to write open '%s'\n", argv[2]);
+		ret = 3;
+	}
 
 	psl_free(&psl);
-	return 0;
+	return ret;
 }
diff --git a/tests/test-is-public-inline.c b/tests/test-is-public-inline.c
index e946617..0af7915 100644
--- a/tests/test-is-public-inline.c
+++ b/tests/test-is-public-inline.c
@@ -83,6 +83,15 @@ static void test_psl(void)
 		}
 	}
 
+	printf("psl_builtin_compile_time()=%ld\n", psl_inline_builtin_compile_time());
+	psl_inline_builtin_compile_time() == 0 ? failed++ : ok++;
+
+	printf("psl_builtin_file_time()=%ld\n", psl_inline_builtin_file_time());
+	psl_inline_builtin_file_time() == 0 ? failed++ : ok++;
+
+	printf("psl_builtin_md5sum()=%s\n", psl_inline_builtin_md5sum());
+	*psl_inline_builtin_md5sum() == 0 ? failed++ : ok++;
+
 	psl_inline_deinit();
 }