CMakeLists.txt: add workaround for using non-installed OpenSSL builds…

… with default libdir

CMakeLists.txt

@@ -56,6 +56,22 @@ if(NOT EXISTS "${OPENSSL_CRYPTO_LIBRARY}")
   message(FATAL_ERROR "OpenSSL crypto library file does not exist: ${OPENSSL_CRYPTO_LIBRARY}")
 endif()
 
+# workaround for using local OpenSSL builds by default expecting that
+# its dynamic libs have been installed in ./${LIB} when using the libs
+# see for binaries dynamically linked to OpenSSL the output of ${LDD} <binary>
+if(CMAKE_SYSTEM_NAME MATCHES "Windows")
+  set(USERS "^(\w:)?\\Users\\")
+  set(LIB "bin")
+else()
+  set(USERS "^/(home|Users)/")
+  set(LIB "lib")
+endif()
+string(REGEX MATCH ${USERS} MATCHED "${OPENSSL_LIB}")
+if(NOT "${MATCHED}" STREQUAL "" AND NOT EXISTS "${OPENSSL_LIB}/${LIB}")
+  execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "." "${OPENSSL_LIB}/${LIB}")
+  # since CMake 3.13, this works also for Windows
+endif()
+
 if(DEFINED ENV{USE_LIBCMP} OR "${OPENSSL_VERSION}" LESS "3")
   set(USE_LIBCMP 1)
   message(STATUS "using libcmp")