diff -Naur trn-4.0-test77/Configure trn-4.0-test77-aur/Configure
--- trn-4.0-test77/Configure	2010-09-01 23:12:26.000000000 -0700
+++ trn-4.0-test77-aur/Configure	2022-07-27 12:45:50.403340652 -0700
@@ -3047,6 +3047,7 @@
 echo "Checking for GNU cc in disguise and/or its version number..." >&4
 $cat >gccvers.c <<EOM
 #include <stdio.h>
+#include <stdlib.h>
 int main() {
 #ifdef __GNUC__
 #ifdef __VERSION__
@@ -4096,6 +4097,7 @@
 echo "Checking your choice of C compiler and flags for coherency..." >&4
 $cat > try.c <<'EOF'
 #include <stdio.h>
+#include <stdlib.h>
 main() { printf("Ok\n"); exit(0); }
 EOF
 set X $cc $optimize $ccflags -o try $ldflags try.c $libs
@@ -4303,6 +4305,7 @@
 echo "Checking for GNU C Library..." >&4
 cat >gnulibc.c <<EOM
 #include <stdio.h>
+#include <stdlib.h>
 int
 main()
 {
@@ -5490,6 +5493,7 @@
 	$cat >foo.c <<EOCP
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <stdlib.h>
 
 main()
 {
@@ -6080,6 +6084,7 @@
 #ifdef I_SYSSELECT
 #include <sys/select.h>
 #endif
+#include <stdlib.h>
 main()
 {
 	struct tm foo;
diff -Naur trn-4.0-test77/scan.c trn-4.0-test77-aur/scan.c
--- trn-4.0-test77/scan.c	2000-05-24 22:11:42.000000000 -0700
+++ trn-4.0-test77-aur/scan.c	2022-07-27 13:18:12.406702116 -0700
@@ -16,6 +16,40 @@
 #include "EXTERN.h"
 #include "sorder.h"
 
+long* s_ent_sort;		/* sorted list of entries in the context */
+long s_ent_sort_max;		/* maximum index of sorted array */
+long s_ent_sorted_max;		/* maximum index *that is sorted* */
+long* s_ent_index;		/* indexes into ent_sorted */
+long s_ent_index_max;		/* maximum entry number added */
+
+int s_page_size;		/* number of entries allocated for page */
+				/* (usually fixed, > max screen lines) */
+PAGE_ENT* page_ents;		/* array of entries on page */
+/* -1 means not initialized for top and bottom entry */
+long s_top_ent;		/* top entry on page */
+long s_bot_ent;		/* bottom entry (note change) */
+bool s_refill;			/* does the page need refilling? */
+/* refresh entries */
+bool s_ref_all;		/* refresh all on page */
+bool s_ref_top;		/* top status bar */
+bool s_ref_bot;		/* bottom status bar */
+/* -1 for the next two entries means don't refresh */
+short s_ref_status;		/* line to start refreshing status from */
+short s_ref_desc;		/* line to start refreshing descript. from */
+/* screen sizes */
+short s_top_lines;		/* lines for top status bar */
+short s_bot_lines;		/* lines for bottom status bar */
+short s_status_cols;		/* characters for status column */
+short s_cursor_cols;		/* characters for cursor column */
+short s_itemnum_cols;		/* characters for item number column */
+short s_desc_cols;		/* characters for description column */
+/* pointer info */
+short s_ptr_page_line;		/* page_ent index */
+long  s_flags;			/* misc. flags */
+
+/* current context type (for fast switching) */
+int s_cur_type;
+
 void
 s_init_context(cnum,type)
 int cnum,type;
diff -Naur trn-4.0-test77/scan.h trn-4.0-test77-aur/scan.h
--- trn-4.0-test77/scan.h	2000-05-24 22:11:42.000000000 -0700
+++ trn-4.0-test77-aur/scan.h	2022-07-27 13:18:48.943369305 -0700
@@ -64,36 +64,36 @@
 
 /* the current values */
 
-long* s_ent_sort;		/* sorted list of entries in the context */
-long s_ent_sort_max;		/* maximum index of sorted array */
-long s_ent_sorted_max;		/* maximum index *that is sorted* */
-long* s_ent_index;		/* indexes into ent_sorted */
-long s_ent_index_max;		/* maximum entry number added */
+extern long* s_ent_sort;		/* sorted list of entries in the context */
+extern long s_ent_sort_max;		/* maximum index of sorted array */
+extern long s_ent_sorted_max;		/* maximum index *that is sorted* */
+extern long* s_ent_index;		/* indexes into ent_sorted */
+extern long s_ent_index_max;		/* maximum entry number added */
 
-int s_page_size;		/* number of entries allocated for page */
+extern int s_page_size;		/* number of entries allocated for page */
 				/* (usually fixed, > max screen lines) */
-PAGE_ENT* page_ents;		/* array of entries on page */
+extern PAGE_ENT* page_ents;		/* array of entries on page */
 /* -1 means not initialized for top and bottom entry */
-long s_top_ent;		/* top entry on page */
-long s_bot_ent;		/* bottom entry (note change) */
-bool s_refill;			/* does the page need refilling? */
+extern long s_top_ent;		/* top entry on page */
+extern long s_bot_ent;		/* bottom entry (note change) */
+extern bool s_refill;			/* does the page need refilling? */
 /* refresh entries */
-bool s_ref_all;		/* refresh all on page */
-bool s_ref_top;		/* top status bar */
-bool s_ref_bot;		/* bottom status bar */
+extern bool s_ref_all;		/* refresh all on page */
+extern bool s_ref_top;		/* top status bar */
+extern bool s_ref_bot;		/* bottom status bar */
 /* -1 for the next two entries means don't refresh */
-short s_ref_status;		/* line to start refreshing status from */
-short s_ref_desc;		/* line to start refreshing descript. from */
+extern short s_ref_status;		/* line to start refreshing status from */
+extern short s_ref_desc;		/* line to start refreshing descript. from */
 /* screen sizes */
-short s_top_lines;		/* lines for top status bar */
-short s_bot_lines;		/* lines for bottom status bar */
-short s_status_cols;		/* characters for status column */
-short s_cursor_cols;		/* characters for cursor column */
-short s_itemnum_cols;		/* characters for item number column */
-short s_desc_cols;		/* characters for description column */
+extern short s_top_lines;		/* lines for top status bar */
+extern short s_bot_lines;		/* lines for bottom status bar */
+extern short s_status_cols;		/* characters for status column */
+extern short s_cursor_cols;		/* characters for cursor column */
+extern short s_itemnum_cols;		/* characters for item number column */
+extern short s_desc_cols;		/* characters for description column */
 /* pointer info */
-short s_ptr_page_line;		/* page_ent index */
-long  s_flags;			/* misc. flags */
+extern short s_ptr_page_line;		/* page_ent index */
+extern long  s_flags;			/* misc. flags */
 
 EXT int s_num_contexts INIT(0);
 /* array of context structures */
@@ -102,7 +102,7 @@
 /* current context number */
 EXT int s_cur_context INIT(0);
 /* current context type (for fast switching) */
-int s_cur_type;
+extern int s_cur_type;
 
 /* options */
 /* show item numbers by default */
diff -Naur trn-4.0-test77/Speller.SH trn-4.0-test77-aur/Speller.SH
--- trn-4.0-test77/Speller.SH	2000-05-24 22:11:41.000000000 -0700
+++ trn-4.0-test77-aur/Speller.SH	2022-07-27 12:45:50.403340652 -0700
@@ -16,7 +16,7 @@
 # what pager you use--if you have kernal paging use cat
 pager="\${PAGER-$pager}"
 # either the ispell program or "none"
-ispell=$ispell_prg
+ispell="$ispell_prg"
 ispell_options=$ispell_options
 test=${test-test}
 sed=${sed-sed}