diff --git a/apps/ocspcheck/CMakeLists.txt b/apps/ocspcheck/CMakeLists.txt
index 9cf7a8b..67ace03 100644
--- a/apps/ocspcheck/CMakeLists.txt
+++ b/apps/ocspcheck/CMakeLists.txt
@@ -4,6 +4,20 @@ set(
 	ocspcheck.c
 )
 
+check_function_exists(getopt HAVE_GETOPT)
+if(HAVE_GETOPT)
+	add_definitions(-DHAVE_GETOPT)
+else()
+	set(GETOPT_SRC compat/getopt.c)
+endif()
+
+check_function_exists(ftruncate HAVE_FTRUNCATE)
+if(HAVE_FTRUNCATE)
+	add_definitions(-DHAVE_FTRUNCATE)
+else()
+	set(FTRUNCATE_SRC compat/ftruncate.c)
+endif()
+
 check_function_exists(memmem HAVE_MEMMEM)
 if(HAVE_MEMMEM)
 	add_definitions(-DHAVE_MEMMEM)
@@ -17,7 +31,7 @@ else()
 	add_definitions(-DDEFAULT_CA_FILE=\"${CMAKE_INSTALL_PREFIX}/etc/ssl/cert.pem\")
 endif()
 
-add_executable(ocspcheck ${OCSPCHECK_SRC})
+add_executable(ocspcheck ${OCSPCHECK_SRC} ${GETOPT_SRC} ${FTRUNCATE_SRC})
 target_include_directories(ocspcheck
 	PRIVATE
 		../../include/compat
diff --git a/apps/ocspcheck/ocspcheck.c b/apps/ocspcheck/ocspcheck.c
index 516642b..3afb68b 100644
--- a/apps/ocspcheck/ocspcheck.c
+++ b/apps/ocspcheck/ocspcheck.c
@@ -561,6 +561,10 @@ main(int argc, char **argv)
 	ssize_t written, w;
 	short port;
 
+#ifndef HAVE_GETOPT
+#include "getopt.h"
+#endif
+
 	while ((ch = getopt(argc, argv, "C:i:No:v")) != -1) {
 		switch (ch) {
 		case 'C':
diff --git a/apps/ocspcheck/compat/ftruncate.c b/apps/ocspcheck/compat/ftruncate.c
new file mode 100644
index 0000000..e825e50
--- /dev/null
+++ b/apps/ocspcheck/compat/ftruncate.c
@@ -0,0 +1,17 @@
+/*
+ * Public domain
+ *
+ * Kinichiro Inoguchi <inoguchi@openbsd.org>
+ */
+
+#ifdef _WIN32
+
+#include <unistd.h>
+
+int
+ftruncate(int fd, off_t length)
+{
+	return _chsize(fd, length);
+}
+
+#endif
diff --git a/apps/ocspcheck/compat/getopt.c b/apps/ocspcheck/compat/getopt.c
new file mode 100644
index 0000000..ff05743
--- /dev/null
+++ b/apps/ocspcheck/compat/getopt.c
@@ -0,0 +1,131 @@
+/*
+ * Public domain
+ *
+ * EternalPhane <eternalphane@gmail.com>
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "getopt.h"
+
+char *optarg = NULL;
+int optind = 0, optopt = '?';
+
+typedef int bool;
+#define true 1
+#define false 0
+
+static int nonopt_begin = 0, nonopt_end = 0;
+
+void clear_buf();
+
+void permute(char *const argv[])
+{
+    static char* buf = NULL;
+    if (!argv && buf)
+        return free(buf);
+    if (!buf)
+        atexit(clear_buf);
+    if (nonopt_begin == nonopt_end)
+    {
+        nonopt_begin = nonopt_end = optind;
+        return;
+    }
+    int nonopt_size = nonopt_end - nonopt_begin,
+        opt_size = optind - nonopt_end;
+    if (nonopt_size <= opt_size)
+    {
+        if (!realloc(buf, nonopt_size))
+            free(buf), buf = malloc(nonopt_size);
+        memcpy(buf, nonopt_begin, nonopt_size);
+        memmove(nonopt_begin, nonopt_end, opt_size);
+        memcpy(nonopt_begin + opt_size, buf, nonopt_size);
+    }
+    else
+    {
+        if (!realloc(buf, opt_size))
+            free(buf), buf = malloc(opt_size);
+        memcpy(buf, nonopt_end, opt_size);
+        memmove(nonopt_begin + opt_size, nonopt_begin, nonopt_size);
+        memcpy(nonopt_begin, buf, opt_size);
+    }
+    nonopt_begin += opt_size;
+    nonopt_end = optind;
+}
+
+void clear_buf()
+{
+    permute(NULL);
+}
+
+int getopt(int argc, char *const argv[], const char *optstring)
+{
+    static char *nextchar = NULL;
+    static bool posixly_correct = false, always_return_nonopt = false;
+    if (optind >= argc)
+        return -1;
+    if (!optind)
+    {
+        nonopt_begin = nonopt_end = 0;
+        posixly_correct = '+' == optstring[0] || getenv("POSIXLY_CORRECT");
+        always_return_nonopt = '-' == optstring[0];
+        if (posixly_correct || always_return_nonopt)
+            optstring++;
+    }
+    if (!nextchar || !*nextchar)
+    {
+        if (!posixly_correct && !always_return_nonopt)
+        {
+            int temp = optind++;
+            for (;;)
+            {
+                if (++temp >= argc || !strcmp("--", argv[temp]))
+                {
+                    permute(argv);
+                    if (temp < argc)
+                    {
+                        optind = temp + 1;
+                        permute(argv);
+                    }
+                    optind = nonopt_begin;
+                    return -1;
+                }
+                if ('-' == argv[temp][0] && argv[temp][1])
+                    break;
+            }
+            if (temp > optind)
+            {
+                permute(argv);
+                nonopt_end = optind = temp;
+            }
+            nextchar = argv[optind] + 1;
+        }
+        else
+        {
+            if (++optind >= argc || !strcmp("--", argv[optind]))
+                return -1;
+            if ('-' != argv[optind][0] || !argv[optind][1])
+                return posixly_correct ? -1 : (optarg = argv[optind++], 1);
+        }
+    }
+    const char *temp = strchr(optstring, *nextchar++);
+    if (!temp)
+        return optopt = *(nextchar - 1), '?';
+    if (':' == temp[1])
+    {
+        bool err = false;
+        if (':' == temp[2])
+            optarg = *nextchar ? nextchar : NULL;
+        else if (*nextchar)
+            optarg = nextchar;
+        else if ('-' != argv[++optind][0])
+            optarg = argv[optind];
+        else
+            return nextchar = argv[optind] + 1,
+                optopt = *temp,
+                ':' == optstring[0] ? ':' : '?';
+        nextchar += strlen(nextchar);
+    }
+    return *temp;
+}
diff --git a/apps/ocspcheck/compat/getopt.h b/apps/ocspcheck/compat/getopt.h
new file mode 100644
index 0000000..ada142e
--- /dev/null
+++ b/apps/ocspcheck/compat/getopt.h
@@ -0,0 +1,15 @@
+/*
+ * Public domain
+ *
+ * EternalPhane <eternalphane@gmail.com>
+ */
+
+#ifndef GETOPT_H__
+#define GETOPT_H__
+
+extern char *optarg;
+extern int optind, opterr, optopt;
+
+int getopt(int argc, char *const argv[], const char *optstring);
+
+#endif
\ No newline at end of file