diff --git a/unfinished/numgame.c b/unfinished/numgame.c
index d444b22..e6dc03a 100644
--- a/unfinished/numgame.c
+++ b/unfinished/numgame.c
@@ -146,7 +146,7 @@ struct operation {
      * Text display of the operator, in expressions and for
      * debugging respectively.
      */
-    char *text, *dbgtext;
+    const char *text, *dbgtext;
 
     /*
      * Flags dictating when the operator can be applied.
@@ -1020,7 +1020,7 @@ void print_recurse_inner(struct sets *s, struct set *ss,
 	 * operand, then write the operator, then the second
 	 * operand, and finally close the paren.
 	 */
-	char *op;
+	const char *op;
 	int parens, thispri, thisassoc;
 
 	/*
diff --git a/unfinished/path.c b/unfinished/path.c
index fe5a47f..2515ed0 100644
--- a/unfinished/path.c
+++ b/unfinished/path.c
@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <assert.h>
 #include "puzzles.h"
 
@@ -530,7 +531,7 @@ if (ctx->sparegrid3[ctx->pathends[i*2]] != i ||
 
 	    ctx->sparepathends[i*2] = first;
 	    ctx->sparepathends[i*2+1] = last;
-//printf("new ends of path %d: %d,%d\n", i, first, last);
+/* printf("new ends of path %d: %d,%d\n", i, first, last); */
 	    ctx->pathspare[i] = 2;     /* fixed */
 	}
     }
@@ -839,7 +840,7 @@ static int *gridgen(int w, int h, random_state *rs)
 int main(void)
 {
     int w = 10, h = 8;
-    random_state *rs = random_init("12345", 5);
+    random_state *rs = random_new("12345", 5);
     int x, y, i, *grid;
 
     for (i = 0; i < 10; i++) {
@@ -863,21 +864,3 @@ int main(void)
     return 0;
 }
 #endif
-
-#ifdef TEST_GENERAL
-#include <stdarg.h>
-
-void fatal(const char *fmt, ...)
-{
-    va_list ap;
-
-    fprintf(stderr, "fatal error: ");
-
-    va_start(ap, fmt);
-    vfprintf(stderr, fmt, ap);
-    va_end(ap);
-
-    fprintf(stderr, "\n");
-    exit(1);
-}
-#endif
diff --git a/unfinished/slide.c b/unfinished/slide.c
index c7a3dce..8c25340 100644
--- a/unfinished/slide.c
+++ b/unfinished/slide.c
@@ -899,7 +899,7 @@ static const char *validate_desc(const game_params *params, const char *desc)
     int *link;
     int mains = 0;
     int i, tx, ty, minmoves;
-    char *ret;
+    const char *ret;
 
     active = snewn(wh, bool);
     link = snewn(wh, int);
@@ -1395,7 +1395,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 	    sprintf(data, "M%d-%d", ui->drag_anchor, ui->drag_currpos);
 	    str = dupstr(data);
 	} else
-	    str = "";		       /* null move; just update the UI */
+	    str = UI_UPDATE;
 	
 	ui->dragging = false;
 	ui->drag_anchor = ui->drag_currpos = -1;