diff --git a/fc-cache/fc-cache.c b/fc-cache/fc-cache.c
index 091eed4..4138d0b 100644
--- a/fc-cache/fc-cache.c
+++ b/fc-cache/fc-cache.c
@@ -34,7 +34,9 @@
 #include <fontconfig/fontconfig.h>
 #include <stdio.h>
 #include <stdlib.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
diff --git a/fc-cat/fc-cat.c b/fc-cat/fc-cat.c
index 69611bc..e2be0cb 100644
--- a/fc-cat/fc-cat.c
+++ b/fc-cat/fc-cat.c
@@ -36,7 +36,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
diff --git a/fc-conflist/fc-conflist.c b/fc-conflist/fc-conflist.c
index 5c40a0f..74d2d9c 100644
--- a/fc-conflist/fc-conflist.c
+++ b/fc-conflist/fc-conflist.c
@@ -35,7 +35,9 @@
 
 #include <fontconfig/fontconfig.h>
 #include <stdio.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
diff --git a/fc-list/fc-list.c b/fc-list/fc-list.c
index 2039acd..c268ea9 100644
--- a/fc-list/fc-list.c
+++ b/fc-list/fc-list.c
@@ -24,7 +24,6 @@
 
 #include <fontconfig/fontconfig.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
@@ -37,6 +36,10 @@
 #define HAVE_GETOPT 1
 #endif
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef ENABLE_NLS
 #include <libintl.h>
 #define _(x)		(dgettext(GETTEXT_PACKAGE, x))
diff --git a/fc-match/fc-match.c b/fc-match/fc-match.c
index dee6147..4362ec1 100644
--- a/fc-match/fc-match.c
+++ b/fc-match/fc-match.c
@@ -33,11 +33,14 @@
 
 #include <fontconfig/fontconfig.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef ENABLE_NLS
 #include <libintl.h>
 #define _(x)		(dgettext(GETTEXT_PACKAGE, x))
diff --git a/fc-pattern/fc-pattern.c b/fc-pattern/fc-pattern.c
index 7989b81..1e9b1ba 100644
--- a/fc-pattern/fc-pattern.c
+++ b/fc-pattern/fc-pattern.c
@@ -33,11 +33,14 @@
 
 #include <fontconfig/fontconfig.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef ENABLE_NLS
 #include <libintl.h>
 #define _(x)		(dgettext(GETTEXT_PACKAGE, x))
diff --git a/fc-query/fc-query.c b/fc-query/fc-query.c
index fbffb84..74841b0 100644
--- a/fc-query/fc-query.c
+++ b/fc-query/fc-query.c
@@ -36,11 +36,14 @@
 #include <fontconfig/fontconfig.h>
 #include <fontconfig/fcfreetype.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef ENABLE_NLS
 #include <libintl.h>
 #define _(x)		(dgettext(GETTEXT_PACKAGE, x))
diff --git a/fc-scan/fc-scan.c b/fc-scan/fc-scan.c
index 9302ac5..02831e0 100644
--- a/fc-scan/fc-scan.c
+++ b/fc-scan/fc-scan.c
@@ -36,11 +36,14 @@
 #include <fontconfig/fontconfig.h>
 #include <fontconfig/fcfreetype.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef ENABLE_NLS
 #include <libintl.h>
 #define _(x)		(dgettext(GETTEXT_PACKAGE, x))
diff --git a/fc-validate/fc-validate.c b/fc-validate/fc-validate.c
index 327ae63..ecd31c6 100644
--- a/fc-validate/fc-validate.c
+++ b/fc-validate/fc-validate.c
@@ -36,11 +36,14 @@
 #include <fontconfig/fontconfig.h>
 #include <fontconfig/fcfreetype.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef ENABLE_NLS
 #include <libintl.h>
 #define _(x)		(dgettext(GETTEXT_PACKAGE, x))
diff --git a/src/fcatomic.c b/src/fcatomic.c
index d12d324..5b5e030 100644
--- a/src/fcatomic.c
+++ b/src/fcatomic.c
@@ -47,13 +47,20 @@
  * held.
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include "fcint.h"
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <unistd.h>
 #include <stdlib.h>
 #include <time.h>
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #ifdef _WIN32
 #include <direct.h>
 #define mkdir(path,mode) _mkdir(path)
diff --git a/src/fccompat.c b/src/fccompat.c
index 16f108d..53436b5 100644
--- a/src/fccompat.c
+++ b/src/fccompat.c
@@ -71,6 +71,21 @@
 #define FC_O_NOINHERIT 0
 #endif
 
+#ifndef HAVE_UNISTD_H
+/* Values for the second argument to access. These may be OR'd together. */
+#ifndef R_OK
+#define R_OK    4       /* Test for read permission.  */
+#endif
+#ifndef W_OK
+#define W_OK    2       /* Test for write permission.  */
+#endif
+#ifndef F_OK
+#define F_OK    0       /* Test for existence.  */
+#endif
+
+typedef int mode_t;
+#endif /* !HAVE_UNISTD_H */
+
 #if !defined (HAVE_MKOSTEMP) && !defined(HAVE_MKSTEMP) && !defined(HAVE__MKTEMP_S)
 static int
 mkstemp (char *template)
diff --git a/src/fcint.h b/src/fcint.h
index 9e1da1e..11efdba 100644
--- a/src/fcint.h
+++ b/src/fcint.h
@@ -40,7 +40,9 @@
 #include <limits.h>
 #include <float.h>
 #include <math.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/test/test-bz106632.c b/test/test-bz106632.c
index 5db912b..0f37b9c 100644
--- a/test/test-bz106632.c
+++ b/test/test-bz106632.c
@@ -29,8 +29,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <dirent.h>
-#include <unistd.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/test/test-d1f48f11.c b/test/test-d1f48f11.c
index 929afd9..9237036 100644
--- a/test/test-d1f48f11.c
+++ b/test/test-d1f48f11.c
@@ -29,8 +29,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <dirent.h>
-#include <unistd.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/test/test-issue107.c b/test/test-issue107.c
index e22c35f..07db3ae 100644
--- a/test/test-issue107.c
+++ b/test/test-issue107.c
@@ -29,8 +29,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <dirent.h>
-#include <unistd.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/test/test-issue110.c b/test/test-issue110.c
index 3794b08..fa20285 100644
--- a/test/test-issue110.c
+++ b/test/test-issue110.c
@@ -29,8 +29,10 @@
 #include <stdlib.h>
 #include <string.h>
 #include <dirent.h>
-#include <unistd.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/test/test-migration.c b/test/test-migration.c
index b7d96dc..d3a0e42 100644
--- a/test/test-migration.c
+++ b/test/test-migration.c
@@ -28,13 +28,14 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 #include <sys/types.h>
 #include <dirent.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
 #ifndef HAVE_STRUCT_DIRENT_D_TYPE
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <unistd.h>
 #endif
 #include <fontconfig/fontconfig.h>