diff -rupN prboom-2.5.0/configure.ac prboom-2.5.0-redox/configure.ac
--- prboom-2.5.0/configure.ac	2008-11-09 11:12:37.000000000 -0800
+++ prboom-2.5.0-redox/configure.ac	2017-10-14 23:27:16.000000000 -0700
@@ -85,8 +85,6 @@ if test "$cross_compiling" != "yes"; the
 fi

 dnl --- Header files, typedefs, structures
-AC_TYPE_UID_T
-AC_TYPE_SIZE_T
 AC_DECL_SYS_SIGLIST
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS(unistd.h asm/byteorder.h sched.h)
diff -rupN prboom-2.5.0/src/d_deh.c prboom-2.5.0-redox/src/d_deh.c
--- prboom-2.5.0/src/d_deh.c	2008-10-11 05:10:38.000000000 -0700
+++ prboom-2.5.0-redox/src/d_deh.c	2017-10-14 23:29:00.000000000 -0700
@@ -54,17 +54,6 @@
 #define TRUE 1
 #define FALSE 0

-#ifndef HAVE_STRLWR
-#include <ctype.h>
-
-static char* strlwr(char* str)
-{
-  char* p;
-  for (p=str; *p; p++) *p = tolower(*p);
-  return str;
-}
-#endif
-
 // killough 10/98: new functions, to allow processing DEH files in-memory
 // (e.g. from wads)