diff --git a/llvm/cmake/config-ix.cmake b/llvm/cmake/config-ix.cmake
index f75e5dfb2656..e3aa10cf7103 100755
--- a/llvm/cmake/config-ix.cmake
+++ b/llvm/cmake/config-ix.cmake
@@ -69,6 +69,7 @@ check_include_file(unistd.h HAVE_UNISTD_H)
 check_include_file(utime.h HAVE_UTIME_H)
 check_include_file(valgrind/valgrind.h HAVE_VALGRIND_VALGRIND_H)
 check_include_file(windows.h HAVE_WINDOWS_H)
+check_include_file(fenv.h HAVE_FENV_H)
 
 # library checks
 if( NOT LLVM_ON_WIN32 )