--- a/perl.c
+++ b/perl.c
@@ -286,7 +286,7 @@ perl_construct(pTHXx)
     PL_localpatches = local_patches;	/* For possible -v */
 #endif
 
-#if defined(LIBM_LIB_VERSION)
+#if defined(LIBM_LIB_VERSION) && (defined(__GLIBC__) || defined(__UCLIBC__))
     /*
      * Some BSDs and Cygwin default to POSIX math instead of IEEE.
      * This switches them over to IEEE.