diff --git a/configure.ac b/configure.ac
index 51feb93..5377012 100644
--- a/configure.ac
+++ b/configure.ac
@@ -50,10 +50,6 @@ PKG_CHECK_MODULES(XZ, [liblzma >= 5.0.0], [have_lzma="yes"], [])
 AM_CONDITIONAL([WITH_ZLIB], [test "x$have_zlib" == "xyes"])
 AM_CONDITIONAL([WITH_LZMA], [test "x$have_lzma" == "xyes"])
 
-AM_CONDITIONAL([HAVE_LIBBSD], [true])
-PKG_CHECK_MODULES(LIBBSD, [libbsd], [],
-				    [AC_MSG_ERROR([missing libbsd])])
-
 ##### generate output #####
 
 AC_CONFIG_HEADERS([config.h])
diff --git a/sqfs/Makemodule.am b/sqfs/Makemodule.am
index 881fabc..ce0cbda 100644
--- a/sqfs/Makemodule.am
+++ b/sqfs/Makemodule.am
@@ -13,10 +13,4 @@ if WITH_ZLIB
 pkg2sqfs_LDADD += $(ZLIB_LIBS)
 endif
 
-if HAVE_LIBBSD
-pkg2sqfs_CPPFLAGS += -DHAVE_LIBBSD
-pkg2sqfs_CFLAGS += $(LIBBSD_CFLAGS)
-pkg2sqfs_LDADD += $(LIBBSD_LIBS)
-endif
-
 bin_PROGRAMS += pkg2sqfs
diff --git a/sqfs/pkg2sqfs.c b/sqfs/pkg2sqfs.c
index 3ce5432..12688ab 100644
--- a/sqfs/pkg2sqfs.c
+++ b/sqfs/pkg2sqfs.c
@@ -87,16 +87,59 @@ static void print_tree(int level, node_t *n)
 
 static long read_number(const char *name, const char *str, long min, long max)
 {
-	const char *errstr;
-	long result;
+	long base = 10, result = 0;
+	int x;
 
-	result = strtonum(str, min, max, &errstr);
-	if (errstr != NULL) {
-		fprintf(stderr, "%s '%s': %s\n", name, str, errstr);
-		exit(EXIT_FAILURE);
+	if (str[0] == '0') {
+		if (str[1] == 'x' || str[1] == 'X') {
+			base = 16;
+			str += 2;
+		} else {
+			base = 8;
+		}
 	}
 
+	if (!isxdigit(*str))
+		goto fail_num;
+
+	while (isxdigit(*str)) {
+		x = *(str++);
+
+		if (isupper(x)) {
+			x = x - 'A' + 10;
+		} else if (islower(x)) {
+			x = x - 'a' + 10;
+		} else {
+			x -= '0';
+		}
+
+		if (x >= base)
+			goto fail_num;
+
+		if (result > (LONG_MAX - x) / base)
+			goto fail_ov;
+
+		result = result * base + x;
+	}
+
+	if (result < min)
+		goto fail_uf;
+
+	if (result > max)
+		goto fail_ov;
+
 	return result;
+fail_num:
+	fprintf(stderr, "%s: expected numeric value > 0\n", name);
+	goto fail;
+fail_uf:
+	fprintf(stderr, "%s: number to small\n", name);
+	goto fail;
+fail_ov:
+	fprintf(stderr, "%s: number to large\n", name);
+	goto fail;
+fail:
+	exit(EXIT_FAILURE);
 }
 
 static int sqfs_padd_file(sqfs_info_t *info)
diff --git a/sqfs/pkg2sqfs.h b/sqfs/pkg2sqfs.h
index bd9e878..2ebf79f 100644
--- a/sqfs/pkg2sqfs.h
+++ b/sqfs/pkg2sqfs.h
@@ -3,19 +3,20 @@
 #define PKG2SQFS_H
 
 #include <sys/types.h>
+#include <sys/stat.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <getopt.h>
 #include <stdint.h>
 #include <assert.h>
+#include <limits.h>
+#include <string.h>
+#include <unistd.h>
 #include <stdio.h>
 #include <fcntl.h>
 #include <errno.h>
-
-#ifdef HAVE_LIBBSD
-#include <bsd/bsd.h>
-#endif
+#include <ctype.h>
 
 #include "util/util.h"