--- Makefile.PL.orig	2019-12-22 16:36:45.000000000 -0800
+++ Makefile.PL	2019-12-22 16:42:07.000000000 -0800
@@ -156,14 +156,11 @@
 }
 
 $common::cflags .= ' -DOLD_SELECT' unless $Config{i_sysselct};
-$common::cflags .= ' -DNO_MEMCPY' unless $Config{d_memcpy};
-$common::cflags .= ' -DHAVE_MEMCPY' if $Config{d_memcpy};
-$common::cflags .= ' -DNO_MEMSET' unless $Config{d_memset};
-$common::cflags .= ' -DHAVE_MEMSET' if $Config{d_memset};
-$common::cflags .= ' -DNO_STRCHR' unless $Config{d_strchr};
+$common::cflags .= ' -DHAVE_MEMCPY';
+$common::cflags .= ' -DHAVE_MEMSET';
 # 	Assume that STRSTR and STRCHR are present simultaneously:
-$common::cflags .= ' -DHAVE_STRCHR -DHAVE_STRSTR' if $Config{d_strchr};
-$common::cflags .= ' -DHAVE_STRERROR' if $Config{d_strerror};
+$common::cflags .= ' -DHAVE_STRCHR -DHAVE_STRSTR';
+$common::cflags .= ' -DHAVE_STRERROR';
 $common::cflags .= ' -DANSI_C' if $Config{'prototype'}; # Will -DPROTOTYPES automatically
 $common::cflags .= ' -Dconst=' unless $Config{d_const};
 $common::cflags .= ' -DNOCOPY' unless $Config{d_bcopy};