diff --git a/GNUmakefile b/GNUmakefile
index 6dff9346..5d9d25b9 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -236,10 +236,7 @@ dist/@tmp-shared_internals.inc: src/elements/version.c $(ALLOY_DEPS) $(lastword
 
 dist/mdbx.c: dist/@tmp-shared_internals.inc $(lastword $(MAKEFILE_LIST))
 	mkdir -p dist && (cat dist/@tmp-shared_internals.inc \
-	&& cat src/elements/core.c src/elements/osal.c src/elements/version.c \
-	&& echo '#if defined(_WIN32) || defined(_WIN64)' \
-	&& cat src/elements/lck-windows.c && echo '#else /* LCK-implementation */' \
-	&& cat src/elements/lck-posix.c && echo '#endif /* LCK-implementation */' \
+	&& cat src/elements/core.c src/elements/osal.c src/elements/version.c src/elements/lck-windows.c src/elements/lck-posix.c \
 	) | grep -v -e '#include "' -e '#pragma once' | sed 's|@INCLUDE|#include|' > $@
 
 define dist-tool-rule
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 82c953da..8a33ede3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -19,14 +19,9 @@ message(STATUS "libmdbx version is ${MDBX_VERSION}")
 if(MDBX_ALLOY_MODE)
   set(LIBMDBX_SOURCES alloy.c)
 else()
-  if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
-    set(LIBMDBX_OSAL windows)
-  else()
-    set(LIBMDBX_OSAL posix)
-  endif()
   set(LIBMDBX_SOURCES
     elements/options.h elements/defs.h elements/internals.h elements/osal.h
-    elements/core.c elements/osal.c elements/lck-${LIBMDBX_OSAL}.c)
+    elements/core.c elements/osal.c elements/lck-posix.c elements/lck-windows.c)
 endif()
 list(APPEND LIBMDBX_SOURCES ../mdbx.h
   "${CMAKE_CURRENT_SOURCE_DIR}/elements/version.c"
diff --git a/src/elements/lck-posix.c b/src/elements/lck-posix.c
index 7ef4ca4d..3754c253 100644
--- a/src/elements/lck-posix.c
+++ b/src/elements/lck-posix.c
@@ -12,6 +12,8 @@
  * <http://www.OpenLDAP.org/license.html>.
  */
 
+#if !(defined(_WIN32) || defined(_WIN64)) /* !Windows LCK-implementation */
+
 #include "internals.h"
 #include <sys/sem.h>
 
@@ -803,3 +805,10 @@ void mdbx_txn_unlock(MDBX_env *env) {
     mdbx_panic("%s() failed: err %d\n", __func__, rc);
   mdbx_jitter4testing(true);
 }
+
+#else
+#ifdef _MSC_VER
+#pragma warning(disable : 4206) /* nonstandard extension used: translation     \
+                                   unit is empty */
+#endif                          /* _MSC_VER (warnings) */
+#endif                          /* !Windows LCK-implementation */
diff --git a/src/elements/lck-windows.c b/src/elements/lck-windows.c
index 264937d9..13178139 100644
--- a/src/elements/lck-windows.c
+++ b/src/elements/lck-windows.c
@@ -12,17 +12,15 @@
  * <http://www.OpenLDAP.org/license.html>.
  */
 
-#include "internals.h"
+#if defined(_WIN32) || defined(_WIN64) /* Windows LCK-implementation */
 
 /* PREAMBLE FOR WINDOWS:
  *
  * We are not concerned for performance here.
  * If you are running Windows a performance could NOT be the goal.
- * Otherwise please use Linux.
- *
- * Regards,
- * LY
- */
+ * Otherwise please use Linux. */
+
+#include "internals.h"
 
 static void mdbx_winnt_import(void);
 
@@ -799,3 +797,5 @@ static void mdbx_winnt_import(void) {
     mdbx_srwlock_ReleaseExclusive = stub_srwlock_ReleaseExclusive;
   }
 }
+
+#endif /* Windows LCK-implementation */