MESSAGE ("CXX-COMPILER: ${CMAKE_CXX_COMPILER}")
IF (${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
MESSAGE ("Unix-like system: ${CMAKE_SYSTEM_NAME}")
-SET (CMAKE_CXX_FLAGS "-std=c++1y -pthread -fdiagnostics-color=always -W -Wall -Wextra -Os")
-SET (CMAKE_C_FLAGS "-std=c11 -pthread -fdiagnostics-color=always -W -Wall -Wextra -Os")
+SET (CMAKE_CXX_FLAGS "-std=c++1y -fno-builtin -fdiagnostics-color=always -W -Wall -Wextra -Os")
+SET (CMAKE_C_FLAGS "-std=c11 -fno-builtin -fdiagnostics-color=always -W -Wall -Wextra -Os")
ELSEIF (${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
MESSAGE ("Windows-like system: ${CMAKE_SYSTEM_NAME}")
SET (CMAKE_CXX_FLAGS "-std=c++1y -W -Wall -Wextra -Os")