diff -u -r nethack-3.6.0.orig/include/unixconf.h nethack-3.6.0/include/unixconf.h
--- nethack-3.6.0.orig/include/unixconf.h	2016-05-27 17:20:03.062318307 -0400
+++ nethack-3.6.0/include/unixconf.h	2016-05-27 17:55:06.332509906 -0400
@@ -36,7 +36,7 @@
 #define NETWORK        /* if running on a networked system */
                        /* e.g. Suns sharing a playground through NFS */
 /* #define SUNOS4 */   /* SunOS 4.x */
-/* #define LINUX */    /* Another Unix clone */
+#define LINUX          /* Another Unix clone */
 /* #define CYGWIN32 */ /* Unix on Win32 -- use with case sensitive defines */
 /* #define GENIX */    /* Yet Another Unix Clone */
 /* #define HISX */     /* Bull Unix for XPS Machines */
@@ -207,7 +207,7 @@
 /* #define COMPRESS_OPTIONS "-q" */
 #endif
 
-#define FCMASK 0660 /* file creation mask */
+#define FCMASK 0666 /* file creation mask */
 
 /* fcntl(2) is a POSIX-portable call for manipulating file descriptors.
  * Comment out the USE_FCNTL if for some reason you have a strange
Only in nethack-3.6.0/include: unixconf.h~
diff -u -r nethack-3.6.0.orig/sys/unix/Makefile.src nethack-3.6.0/sys/unix/Makefile.src
--- nethack-3.6.0.orig/sys/unix/Makefile.src	2016-05-27 17:20:03.082318966 -0400
+++ nethack-3.6.0/sys/unix/Makefile.src	2016-05-27 17:42:47.183397931 -0400
@@ -64,7 +64,7 @@
 #	if you get setcgtty() warnings during execution, you are feeding gcc
 #		a non-ANSI <sys/ioctl.h> -- either run fixincludes on it or use
 #		-traditional in CFLAGS
-# CC = gcc
+CC = gcc
 #
 #	For Bull DPX/2 systems at B.O.S. 2.0 or higher use the following:
 #
@@ -238,7 +238,7 @@
 # WINTTYLIB = -ltermcap
 # WINTTYLIB = -lcurses
 # WINTTYLIB = -lcurses16
-# WINTTYLIB = -lncurses
+WINTTYLIB = -lncurses
 #WINTTYLIB = -ltermlib
 #
 # libraries for X11
diff -u -r nethack-3.6.0.orig/sys/unix/Makefile.utl nethack-3.6.0/sys/unix/Makefile.utl
--- nethack-3.6.0.orig/sys/unix/Makefile.utl	2016-05-27 17:20:03.082318966 -0400
+++ nethack-3.6.0/sys/unix/Makefile.utl	2016-05-27 20:01:54.605040799 -0400
@@ -18,7 +18,7 @@
 
 # if you are using gcc as your compiler,
 #	uncomment the CC definition below if it's not in your environment
-# CC = gcc
+CC = gcc
 #
 #	For Bull DPX/2 systems at B.O.S. 2.0 or higher use the following:
 #
@@ -104,11 +104,11 @@
 
 # yacc/lex programs to use to generate *_comp.h, *_lex.c, and *_yacc.c.
 # if, instead of yacc/lex you have bison/flex, comment/uncomment the following.
-YACC     = yacc
-LEX      = lex
-# YACC     = bison -y
+# YACC     = yacc
+# LEX      = lex
+YACC     = bison -y
 # YACC     = byacc
-# LEX      = flex
+LEX      = flex
 
 # these are the names of the output files from YACC/LEX. Under MS-DOS
 # and similar systems, they may differ
Only in nethack-3.6.0/sys/unix: Makefile.utl~