diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84c86c0..5c5b927 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,6 +7,12 @@ include(CheckIncludeFile)
 include(CheckLibraryExists)
 include(CheckSymbolExists)
 
+# In msys, `pkg-config --libs` returns `-lmingw32` but find_library() cannot
+# find it in default search paths.
+if (MSYS)
+  list(APPEND CMAKE_LIBRARY_PATH $ENV{MINGW_PREFIX}/$ENV{MINGW_CHOST}/lib)
+endif ()
+
 # A wrapper around find_package() that skips the check if ENABLE_<package> is false
 macro (optional_find_package package)
   option(ENABLE_${package} "Use ${package} if available" ON)
@@ -23,6 +29,11 @@ macro (optional_pkg_check_modules prefix)
   endif()
 endmacro()
 
+check_symbol_exists(getlogin "unistd.h" HAVE_GETLOGIN)
+check_symbol_exists(mmap "sys/mman.h" HAVE_MMAP)
+check_symbol_exists(sigaction "signal.h" HAVE_SIGACTION)
+check_symbol_exists(uname "sys/utsname.h" HAVE_UNAME)
+
 if (EMSCRIPTEN)
   set(SDL2_FOUND 1)
   set(FREETYPE_FOUND 1)
@@ -141,11 +152,13 @@ if (EMSCRIPTEN)
   list(APPEND SRC_MIDI midi.emscripten.c)
   list(APPEND SUMMARY_MIDI "Emscripten")
 else()
-  list(APPEND SRC_MIDI midi.rawmidi.c midifile.c)
-  list(APPEND SUMMARY_MIDI "raw")
-  set(MIDI_DEVICE "/dev/midi" CACHE STRING "midi device")
-  set(ENABLE_MIDI_RAWMIDI 1)
-  option(QUIET_MIDI "No display midi stdout" OFF)
+  if (HAVE_SIGACTION)
+    list(APPEND SRC_MIDI midi.rawmidi.c midifile.c)
+    list(APPEND SUMMARY_MIDI "raw")
+    set(MIDI_DEVICE "/dev/midi" CACHE STRING "midi device")
+    set(ENABLE_MIDI_RAWMIDI 1)
+    option(QUIET_MIDI "No display midi stdout" OFF)
+  endif()
 
   if (CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
 	check_symbol_exists(SNDCTL_SEQ_NRSYNTHS "machine/soundcard.h" ENABLE_MIDI_SEQMIDI)
diff --git a/README.md b/README.md
index 7802169..f99c9e2 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,16 @@ cmake の実行でエラーになる場合は必要なライブラリをイン
     $ cmake -DCMAKE_BUILD_TYPE=Debug ../../
     $ make && make install
 
+### Windows
+
+[MSYS2](https://www.msys2.org) が必要です。
+
+    $ pacman -S cmake mingw-w64-x86_64-cmake mingw-w64-x86_64-SDL2 mingw-w64-x86_64-SDL2_ttf mingw-w64-x86_64-SDL2_mixer
+    $ mkdir -p out/debug
+    $ cd out/debug
+    $ cmake -G"MSYS Makefiles" -DCMAKE_BUILD_TYPE=Debug ../../
+    $ make
+
 ### Emscripten
 
     $ mkdir -p out/wasm
diff --git a/config.h.in b/config.h.in
index 8f002c6..8cd8f4d 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1,6 +1,8 @@
 #cmakedefine PACKAGE "@PACKAGE@"
 #define VERSION "1.7.3sdl2"
 
+#cmakedefine CMAKE_SYSTEM_NAME "@CMAKE_SYSTEM_NAME@"
+
 #define RGB_ORDER 1
 #cmakedefine WORDS_BIGENDIAN @WORDS_BIGENDIAN@
 
@@ -29,7 +31,11 @@
 
 #cmakedefine QUIET_MIDI @QUIET_MIDI@
 
+#cmakedefine HAVE_GETLOGIN @HAVE_GETLOGIN@
+#cmakedefine HAVE_MMAP @HAVE_MMAP@
 #cmakedefine HAVE_SDLJOY @HAVE_SDLJOY@
+#cmakedefine HAVE_SIGACTION @HAVE_SIGACTION@
+#cmakedefine HAVE_UNAME @HAVE_UNAME@
 #cmakedefine HAVE_XF86VMODE @HAVE_XF86VMODE@
 
 #define DEFAULT_GOTHIC_TTF "@DEFAULT_FONT_PATH@/MTLc3m.ttf"
diff --git a/src/bgm.sdlmixer.c b/src/bgm.sdlmixer.c
index 0935d1b..e8f0f46 100644
--- a/src/bgm.sdlmixer.c
+++ b/src/bgm.sdlmixer.c
@@ -72,7 +72,7 @@ static void bgi_read() {
 	if (nact->files.bgi == NULL)
 		return;
 
-	FILE *fp = fopen(nact->files.bgi, "r");
+	FILE *fp = fopen(nact->files.bgi, "rb");
 	if (!fp) {
 		WARNING("Could not open %s\n", nact->files.bgi);
 		return;
diff --git a/src/cmd2F.c b/src/cmd2F.c
index a1429be..aad685e 100644
--- a/src/cmd2F.c
+++ b/src/cmd2F.c
@@ -25,7 +25,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/utsname.h>
 #include "portab.h"
 #include "xsystem35.h"
 #include "savedata.h"
@@ -38,6 +37,9 @@
 #include "graphicsdevice.h"
 #include "ald_manager.h"
 #include "LittleEndian.h"
+#if HAVE_UNAME
+#include <sys/utsname.h>
+#endif
 
 /* defined by cmdm.c */
 extern boolean have_eng_mp_patch;
@@ -868,17 +870,21 @@ void commands2F51() {
 
 void commands2F52() {
 	int eNum = getCaliValue();
+	if (eNum <= 0) return;
+
+#if HAVE_UNAME
 	struct utsname un;
 	char s[256];
-	
-	if (eNum <= 0) return;
 	if (uname(&un) < 0) return;
 	NOTICE("sysname %s nodename %s release %s version %s machine %s\n",
 	       un.sysname, un.nodename, un.release, un.version, un.machine);
 	sprintf(s,"%s %s %s",
 		un.sysname, un.release, un.machine);
+#else
+	const char *s = CMAKE_SYSTEM_NAME;
+#endif
+
 	v_strcpy(eNum -1, s);
-	
 	DEBUG_COMMAND("sysGetOsName %d: %s\n", eNum, s);
 }
 
diff --git a/src/cmdz.c b/src/cmdz.c
index 809ad18..872c4b2 100644
--- a/src/cmdz.c
+++ b/src/cmdz.c
@@ -449,16 +449,16 @@ void commandZZ13() {
 
 void commandZZ14() {
 	int no = getCaliValue();
+	char *s = "xsys35_user";
+
+#ifdef HAVE_GETLOGIN
 	char *lname=getlogin();
+	if (lname)
+		s = lname;
+#endif
 	
 	if (no <= 0) return;
-	if (lname) {
-		v_strcpy(no -1, lname);
-	} else {
-		char s[256];
-		sprintf(s, "%d", getuid());
-		v_strcpy(no -1, s);
-	}
+	v_strcpy(no -1, s);
 	
 	DEBUG_COMMAND("ZZ14 %d:\n", no);
 }
diff --git a/src/dri.c b/src/dri.c
index ae5407d..de53a9e 100644
--- a/src/dri.c
+++ b/src/dri.c
@@ -26,7 +26,6 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <unistd.h>
-#include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -34,6 +33,9 @@
 #include "system.h"
 #include "LittleEndian.h"
 #include "dri.h"
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+#endif
 
 /*
  * static maethods
@@ -184,7 +186,7 @@ drifiles *dri_init(char **file, int cnt, boolean mmapping) {
 	for (i = 0; i < cnt; i++) {
 		if (*(file + i) == NULL) continue;
 		/* open check */
-		if (NULL == (fp = fopen(*(file + i), "r"))) {
+		if (NULL == (fp = fopen(*(file + i), "rb"))) {
 			SYSERROR("File %s is not found\n", *(file + i));
 		}
 		/* check is drifile or noe */
@@ -204,6 +206,7 @@ drifiles *dri_init(char **file, int cnt, boolean mmapping) {
 		d->fnames[i] = strdup(*(file + i));
 		/* close */
 		fclose(fp);
+#ifdef HAVE_MMAP
 		/* mmap */
 		if (mmapping) {
 			int fd;
@@ -219,6 +222,7 @@ drifiles *dri_init(char **file, int cnt, boolean mmapping) {
 			}
 			d->mmapped = TRUE;
 		}
+#endif
 	}
 	return d;
 }
@@ -257,7 +261,7 @@ dridata *dri_getdata(drifiles *d, int no) {
 		int readsize = dataptr2 - dataptr;
 		FILE *fp;
 		data = malloc(sizeof(char) * readsize);
-		fp = fopen(d->fnames[disk], "r");
+		fp = fopen(d->fnames[disk], "rb");
 		fseek(fp, dataptr, SEEK_SET);
 		fread(data, 1, readsize, fp);
 		fclose(fp);
diff --git a/src/filecheck.c b/src/filecheck.c
index ebb0548..3d5c88f 100644
--- a/src/filecheck.c
+++ b/src/filecheck.c
@@ -98,9 +98,9 @@ FILE *fc_open(char *filename, char type) {
 	FILE *fp;
 	if (type == 'w') {
 		fc_backup_oldfile(fullpath);
-		fp = fopen(fullpath, "w");
+		fp = fopen(fullpath, "wb");
 	} else {
-		fp = fopen(fullpath, "r");
+		fp = fopen(fullpath, "rb");
 	}
 	free(fullpath);
 	return fp;
diff --git a/src/pcm.sdlmixer.c b/src/pcm.sdlmixer.c
index dad5493..0220789 100644
--- a/src/pcm.sdlmixer.c
+++ b/src/pcm.sdlmixer.c
@@ -28,7 +28,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdint.h>
-#include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
@@ -44,6 +43,9 @@
 #include "counter.h"
 #include "nact.h"
 #include "LittleEndian.h"
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+#endif
 
 #define DEFAULT_AUDIO_BUFFER_SIZE 2048
 
@@ -359,15 +361,39 @@ static int load_wai() {
 		goto endwai;
 	}
 	
+#ifdef HAVE_MMAP
 	if (MAP_FAILED == (adr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, fd, 0))) {
 		WARNING("mmap: %s\n", strerror(errno));
 		close(fd);
 		goto endwai;
 	}
+#else
+	adr = malloc(sbuf.st_size);
+	if (!adr) {
+		WARNING("load_wai: out of memory\n");
+		close(fd);
+		goto endwai;
+	}
+	size_t bytes = 0;
+	while (bytes < sbuf.st_size) {
+		ssize_t ret = read(fd, adr, sbuf.st_size);
+		if (ret <= 0) {
+			WARNING("load_wai: failed to read\n");
+			close(fd);
+			free(adr);
+			goto endwai;
+		}
+		bytes += ret;
+	}
+#endif
 	
 	if (*adr != 'X' || *(adr+1) != 'I' || *(adr+2) != '2') {
 		WARNING("not WAI file\n");
+#ifdef HAVE_MMAP
 		munmap(adr, sbuf.st_size);
+#else
+		free(adr);
+#endif
 		close(fd);
 		goto endwai;
 	}
diff --git a/src/s39init.c b/src/s39init.c
index 3f8c3bb..4ce8437 100644
--- a/src/s39init.c
+++ b/src/s39init.c
@@ -73,7 +73,7 @@ int s39ini_init(void) {
 	
 	// Volume.sav があればそれを読み込む
 	snprintf(fn, sizeof(fn) -1, "%s/Volume.sav", nact->files.savedir);
-	if (NULL == (fp = fopen(fn, "r"))) {
+	if (NULL == (fp = fopen(fn, "rb"))) {
 		// とりあえず、初期ボリュームは 100
 		for (i = 0; i < MAXVOLCH; i++) {
 			vol[i] = vval[i].vol = 100;
@@ -143,7 +143,7 @@ int s39ini_remove() {
 	}
 	
 	snprintf(fn, sizeof(fn) -1, "%s/Volume.sav", nact->files.savedir);
-	if (NULL == (fp = fopen(fn, "w"))) {
+	if (NULL == (fp = fopen(fn, "wb"))) {
 		WARNING("Fail to save Volume.save\n");
 		return NG;
 	}
diff --git a/src/xsystem35.c b/src/xsystem35.c
index 45e9a88..3ad7cf0 100644
--- a/src/xsystem35.c
+++ b/src/xsystem35.c
@@ -28,11 +28,14 @@
 #include <string.h>
 #include <stdarg.h>
 #include <unistd.h>
-#include <signal.h>
 #include <sys/types.h>
 #include <dirent.h>
 #include <ctype.h>
 
+#ifdef HAVE_SIGACTION
+#include <signal.h>
+#endif
+
 #ifdef ENABLE_GTK
 #  define GTK_RC_NAME ".gtk/gtkrc"
 #  include <gtk/gtk.h>
@@ -72,10 +75,7 @@ static void    sys35_init();
 static void    sys35_remove();
 static boolean sys35_initGameDataResorce();
 static void    sys35_ParseOption(int *argc, char **argv);
-static void    signal_handler(int sig_num);
-static void    signal_handler_segv(int sig_num);
 static void    check_profile();
-static void    init_signalhandler();
 
 /* for debugging */
 static FILE *fpdebuglog;
@@ -543,17 +543,6 @@ void sys_reset() {
 	sys_error("exec fail");
 }
 
-static void signal_handler(int sig_num) {
-	sys35_remove();
-	exit(1);
-}	
-
-static void signal_handler_segv(int sig_num) {
-	fprintf(stderr, "PID(%d), sigsegv caught @ %03d, %05x\n", (int)getpid(), sl_getPage(), sl_getIndex());
-	sys35_remove();
-	exit(1);
-}	
-
 static void sys35_ParseOption(int *argc, char **argv) {
 	int i;
 	FILE *fp;
@@ -746,6 +735,18 @@ static void check_profile() {
 	}
 }
 
+#ifdef HAVE_SIGACTION
+static void signal_handler(int sig_num) {
+	sys35_remove();
+	exit(1);
+}
+
+static void signal_handler_segv(int sig_num) {
+	fprintf(stderr, "PID(%d), sigsegv caught @ %03d, %05x\n", (int)getpid(), sl_getPage(), sl_getIndex());
+	sys35_remove();
+	exit(1);
+}
+
 void sys_set_signalhandler(int SIG, void (*handler)(int)) {
 	struct sigaction act;
 	sigset_t smask;
@@ -760,17 +761,20 @@ void sys_set_signalhandler(int SIG, void (*handler)(int)) {
 	sigaction(SIG, &act, NULL);
 }
 
-void init_signalhandler() {
+static void init_signalhandler() {
 	sys_set_signalhandler(SIGINT, signal_handler);
 	sys_set_signalhandler(SIGTERM, signal_handler);
 	sys_set_signalhandler(SIGPIPE, SIG_IGN);
 	sys_set_signalhandler(SIGABRT, signal_handler);
 	sys_set_signalhandler(SIGSEGV, signal_handler_segv);
 }
+#endif
 
 int main(int argc, char **argv) {
 	char *homedir = getenv("HOME"), *rc_name, *rc_path;
+#ifdef HAVE_SIGACTION
 	sys_set_signalhandler(SIGINT, SIG_IGN);
+#endif
 	
 	saved_argc = argc;
 	saved_argv = argv;
@@ -788,7 +792,9 @@ int main(int argc, char **argv) {
 #endif
 	sys35_initGameDataResorce();
 	
+#ifdef HAVE_SIGACTION
 	init_signalhandler();
+#endif
 
 	mus_init(audio_buffer_size);