-librt is still need...

CMakeLists.txt

@@ -247,7 +247,6 @@ if(PIP_MATH_YN)
 	add_definitions(-DPIP_MATH_YN)
 endif()
 
-
 # Check if build debug version
 if (PIP_BUILD_DEBUG)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g3 -Wall")
@@ -316,6 +315,7 @@ if ((NOT DEFINED SHSTKPROJECT) AND (DEFINED ANDROID_PLATFORM))
 	#message("${ANDROID_SYSTEM_LIBRARY_PATH}/usr/include")
 	#message("${ANDROID_NDK}/sysroot/usr/include")
 endif()
+
 if(NOT PIP_FREERTOS)
 	if(WIN32)
 		if(${C_COMPILER} STREQUAL "cl.exe")
@@ -329,6 +329,10 @@ else()
 		else()
 			if (NOT DEFINED ANDROID_PLATFORM)
 				list(APPEND LIBS_MAIN pthread util)
+			else()
+				if (NOT APPLE)
+					list(APPEND LIBS_MAIN rt)
+				endif()
 			endif()
 		endif()
 	endif()

cmake/FindPIP.cmake

@@ -67,6 +67,10 @@ if (NOT BUILDING_PIP)
 			find_library(PTHREAD_LIBRARY pthread)
 			find_library(UTIL_LIBRARY util)
 			set(_PIP_ADD_LIBS_ ${PTHREAD_LIBRARY} ${UTIL_LIBRARY})
+			if((NOT DEFINED ENV{QNX_HOST}) AND (NOT APPLE) AND (NOT PIP_FREERTOS))
+				find_library(RT_LIBRARY rt)
+				list(APPEND _PIP_ADD_LIBS_ ${RT_LIBRARY})
+			endif()
 			list(APPEND PIP_LIBRARY ${_PIP_ADD_LIBS_})
 		endif()
 	endif()