--- libwebsockets-3.1.0/CMakeLists.txt.orig	2018-12-27 14:24:26.506882000 +0300
+++ libwebsockets-3.1.0/CMakeLists.txt	2018-12-27 14:24:42.668510400 +0300
@@ -681,10 +681,12 @@
 	set(CMAKE_REQUIRED_LIBRARIES network)
 endif()
 
+if (NOT WIN32)
 CHECK_C_SOURCE_COMPILES(
 	"#include <strings.h>
 	int main(int argc, char **argv) { char buf[1]; bzero(buf, 1); return 0; }
 	" LWS_HAVE_BZERO)
+endif()
 
 CHECK_FUNCTION_EXISTS(fork LWS_HAVE_FORK)
 CHECK_FUNCTION_EXISTS(getenv LWS_HAVE_GETENV)