Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -389,7 +389,7 @@ if("${LINKER_VERSION}" MATCHES "GNU gold" OR "${LINKER
     set(LINKER_FLAGS "${LINKER_FLAGS} -Wl,--gc-sections")
   endif()
   # Default linker optimization flags
-  set(LINKER_FLAGS "${LINKER_FLAGS} -Wl,-O1 -Wl,--hash-style=gnu -Wl,--sort-common")
+  set(LINKER_FLAGS "${LINKER_FLAGS} -Wl,--sort-common")
 
 else()
   message(STATUS "Using unknown linker, not setting linker optimizations")
@@ -419,7 +419,7 @@ if(APPLE)
   endif()
 endif()
 
-if(UNIX AND NOT APPLE)
+if(UNIX AND NOT APPLE AND NOT "${CMAKE_SYSTEM_NAME}" MATCHES "OpenBSD")
   set(MAYBE_RT_LIBRARY -lrt)
 endif()