diff --git a/src/lib_proj.cmake b/src/lib_proj.cmake
index bc27baf..32902b0 100644
--- a/src/lib_proj.cmake
+++ b/src/lib_proj.cmake
@@ -435,6 +435,10 @@ if(UNIX)
   if(M_LIB)
     target_link_libraries(${PROJ_CORE_TARGET} -lm)
   endif()
+  find_library(DL_LIB dl)
+  if(DL_LIB)
+    target_link_libraries(${PROJ_CORE_TARGET} -ldl)
+  endif()
 endif()
 if(USE_THREAD AND Threads_FOUND AND CMAKE_USE_PTHREADS_INIT)
   target_link_libraries(${PROJ_CORE_TARGET} ${CMAKE_THREAD_LIBS_INIT})
diff --git a/src/proj_json_streaming_writer.hpp b/src/proj_json_streaming_writer.hpp
index 6267684..163da43 100644
--- a/src/proj_json_streaming_writer.hpp
+++ b/src/proj_json_streaming_writer.hpp
@@ -33,6 +33,7 @@
 
 #include <vector>
 #include <string>
+#include <cstdint>
 
 #define CPL_DLL