diff -rupN orig/CMakeLists.txt patched/CMakeLists.txt
--- orig/CMakeLists.txt	1970-01-01 01:00:00.000000000 +0100
+++ patched/CMakeLists.txt	2019-11-21 17:42:30.000000000 +0100
@@ -0,0 +1,77 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(libcoap)
+
+set(SOURCES src/address.c
+            src/async.c
+            src/block.c
+            src/coap_debug.c
+            src/coap_event.c
+            src/coap_hashkey.c
+            src/coap_gnutls.c
+            src/coap_io.c
+            src/coap_notls.c
+            src/coap_openssl.c
+            src/coap_session.c
+            src/coap_time.c
+            src/coap_tinydtls.c
+            src/encode.c
+            src/mem.c
+            src/net.c
+            src/option.c
+            src/pdu.c
+            src/resource.c
+            src/str.c
+            src/subscribe.c
+            src/uri.c)
+if(WIN32)
+  configure_file(include/coap2/coap.h.windows include/coap2/coap.h COPYONLY)
+  configure_file(coap_config.h.windows coap_config.h COPYONLY)
+elseif(APPLE)
+  configure_file(include/coap2/coap.h.macos include/coap2/coap.h COPYONLY)
+  configure_file(coap_config.h.macos coap_config.h COPYONLY)
+endif()
+
+set(PUBLIC_HEADERS include/coap2/address.h
+                   include/coap2/async.h
+                   include/coap2/bits.h
+                   include/coap2/block.h
+                   ${CMAKE_BINARY_DIR}/include/coap2/coap.h
+                   include/coap2/coap_debug.h
+                   include/coap2/coap_dtls.h
+                   include/coap2/coap_event.h
+                   include/coap2/coap_forward_decls.h
+                   include/coap2/coap_hashkey.h
+                   include/coap2/coap_io.h
+                   include/coap2/coap_mutex.h
+                   include/coap2/coap_session.h
+                   include/coap2/coap_time.h
+                   include/coap2/encode.h
+                   include/coap2/libcoap.h
+                   include/coap2/mem.h
+                   include/coap2/net.h
+                   include/coap2/option.h
+                   include/coap2/pdu.h
+                   include/coap2/prng.h
+                   include/coap2/resource.h
+                   include/coap2/str.h
+                   include/coap2/subscribe.h
+                   include/coap2/uri.h
+                   include/coap2/uthash.h)
+
+add_library(coap STATIC ${SOURCES})
+
+set_property(TARGET coap PROPERTY POSITION_INDEPENDENT_CODE ON)
+
+target_include_directories(coap
+                            PRIVATE
+                              ${CMAKE_BINARY_DIR}
+                            PUBLIC
+                              include/coap2
+                              ${CMAKE_BINARY_DIR}/include/coap2/)
+
+install(TARGETS coap
+    ARCHIVE DESTINATION lib
+)
+
+install(FILES ${PUBLIC_HEADERS} DESTINATION include/coap2)
diff -rupN orig/coap_config.h.windows patched/coap_config.h.windows
--- orig/coap_config.h.windows	2019-11-21 17:42:00.000000000 +0100
+++ patched/coap_config.h.windows	2019-11-22 09:11:43.000000000 +0100
@@ -67,7 +67,7 @@
 #define snprintf _snprintf
 #endif
 
-#define HAVE_OPENSSL 1
+/* #define HAVE_OPENSSL 1 */
 
 /* Define to the address where bug reports for this package should be sent. */
 #define PACKAGE_BUGREPORT "libcoap-developers@lists.sourceforge.net"