diff --git a/auto/headers b/auto/headers
index 29eec60..d41d95a 100644
--- a/auto/headers
+++ b/auto/headers
@@ -6,3 +6,5 @@
 ngx_include="inttypes.h";  . auto/include
 ngx_include="limits.h";    . auto/include
 ngx_include="sys/filio.h"; . auto/include
+ngx_include="crypt.h";     . auto/include
+ngx_include="malloc.h";    . auto/include
diff --git a/src/os/unix/ngx_posix_config.h b/src/os/unix/ngx_posix_config.h
index f796576..9898de0 100644
--- a/src/os/unix/ngx_posix_config.h
+++ b/src/os/unix/ngx_posix_config.h
@@ -19,6 +19,11 @@
 #endif
 
 
+#ifdef __CYGWIN__
+#define timezonevar             /* timezone is variable */
+#endif
+
+
 #include <sys/types.h>
 #include <sys/time.h>
 #if (NGX_HAVE_UNISTD_H)
@@ -64,6 +69,15 @@
 #include <limits.h>             /* IOV_MAX */
 #endif
 
+#if (NGX_HAVE_MALLOC_H)
+#include <malloc.h>             /* memalign() */
+#endif
+
+#if (NGX_HAVE_CRYPT_H)
+#include <crypt.h>
+#endif
+
+
 #ifndef IOV_MAX
 #define IOV_MAX   16
 #endif