--- a/CMakeLists.txt	2021-03-26 08:23:16.460538851 +0100
+++ b/CMakeLists.txt	2021-03-26 08:25:31.408531072 +0100
@@ -81,6 +81,9 @@
         find_package(LibCrypto REQUIRED)
         set(PLATFORM_LIBS LibCrypto::Crypto dl)
     endif()
+    if (NOT BUILD_SHARED_LIBS)
+        set(PLATFORM_LIBS ${PLATFORM_LIBS} z)
+    endif()
 endif()
 
 file(GLOB CAL_HEADERS