Index: blosc/CMakeLists.txt
--- blosc/CMakeLists.txt.orig
+++ blosc/CMakeLists.txt
@@ -234,7 +234,9 @@ if(HAVE_IPP)
 endif()
 
 if(UNIX AND NOT APPLE)
-    set(LIBS ${LIBS} "rt")
+    if(NOT CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
+        set(LIBS ${LIBS} "rt")
+    endif()
     set(LIBS ${LIBS} "m")
     # set(LIBS ${LIBS} "profiler")
 endif()
