diff -up plplot-plplot-a9d9500c732d4eae47ed7fca687e02ec8a48d02c/cmake/modules/csiro.cmake.ieee plplot-plplot-a9d9500c732d4eae47ed7fca687e02ec8a48d02c/cmake/modules/csiro.cmake
--- plplot-plplot-a9d9500c732d4eae47ed7fca687e02ec8a48d02c/cmake/modules/csiro.cmake.ieee	2018-09-19 20:31:11.333168883 -0600
+++ plplot-plplot-a9d9500c732d4eae47ed7fca687e02ec8a48d02c/cmake/modules/csiro.cmake	2018-09-19 20:31:56.323728783 -0600
@@ -27,15 +27,6 @@ option(WITH_CSA "Enable use of the csa l
 # expanded to a lot more cases as we gain platform experience.
 set(NAN_CFLAGS ${CMAKE_C_FLAGS})
 if(PL_HAVE_QHULL OR WITH_CSA)
-  if(CMAKE_SYSTEM_PROCESSOR MATCHES "i[0-9]86" AND NOT CMAKE_C_COMPILER MATCHES "gcc")
-    set(NAN_CFLAGS "${NAN_CFLAGS} -mieee-fp")
-  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "alpha.*")
-    if(CMAKE_C_COMPILER MATCHES "gcc")
-      set(NAN_CFLAGS "${NAN_CFLAGS} -mieee")
-    else(CMAKE_C_COMPILER MATCHES "gcc")
-      set(NAN_CFLAGS "${NAN_CFLAGS} -ieee")
-    endif(CMAKE_C_COMPILER MATCHES "gcc")
-  endif(CMAKE_SYSTEM_PROCESSOR MATCHES "i[0-9]86" AND NOT CMAKE_C_COMPILER MATCHES "gcc")
   if(NOT DEFINED NaNAwareCCompiler)
     message(STATUS "Check for NaN awareness in C compiler")
     try_run(RUN_RESULT COMPILE_RESULT