3 files changed, 4 insertions, 8 deletions
diff --git a/source/kit/threads.h b/source/kit/threads.h
index d98978d..584ac7c 100644
--- a/source/kit/threads.h
+++ b/source/kit/threads.h
@@ -48,11 +48,9 @@
 #  if defined(_WIN32) && !defined(__CYGWIN__)
 #    include <io.h>      /* close */
 #    include <process.h> /* _exit */
-#  elif defined(KIT_HAVE_PTHREAD)
+#  else
 #    include <pthread.h>
 #    include <unistd.h> /* close, _exit */
-#  else
-#    error Not supported on this platform.
 #  endif
 
 /*---------------------------- macros ---------------------------*/
@@ -123,7 +121,7 @@ typedef struct {
 #    define ONCE_FLAG_INIT \
       { 0 }
 #    define TSS_DTOR_ITERATIONS 1
-#  elif defined(KIT_HAVE_PTHREAD)
+#  else
 typedef pthread_cond_t  cnd_t;
 typedef pthread_t       thrd_t;
 typedef pthread_key_t   tss_t;
@@ -138,8 +136,6 @@ typedef pthread_once_t  once_flag;
 #      define TSS_DTOR_ITERATIONS \
         1 // assume TSS dtor MAY be called at least once.
 #    endif
-#  else
-#    error Not supported on this platform.
 #  endif
 
 /*-------------------- enumeration constants --------------------*/
diff --git a/source/kit/threads.posix.c b/source/kit/threads.posix.c
index 20ef1ae..f8c20f9 100644
--- a/source/kit/threads.posix.c
+++ b/source/kit/threads.posix.c
@@ -30,7 +30,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 #ifndef KIT_DISABLE_SYSTEM_THREADS
-#  ifdef KIT_HAVE_PTHREAD
+#  if !defined(_WIN32) || defined(__CYGWIN__)
 
 #    include <assert.h>
 #    include <errno.h>
diff --git a/source/test/unittests/test_duration.test.c b/source/test/unittests/test_duration.test.c
index 58faf4a..5d9e578 100644
--- a/source/test/unittests/test_duration.test.c
+++ b/source/test/unittests/test_duration.test.c
@@ -1,7 +1,7 @@
 #define KIT_TEST_FILE test_duration
 #include "../../kit_test/test.h"
 
-#ifdef _WIN32
+#if defined(_WIN32) && !defined(__CYGWIN__)
 __declspec(dllimport) void __stdcall Sleep(unsigned long timeout);
 static void kit_sleep(int ms) {
   Sleep(ms);