diff -ru Sjeng-Free-11.2-orig/book.c Sjeng-Free-11.2/book.c
--- Sjeng-Free-11.2-orig/book.c	2011-07-23 23:26:30.000000000 +0200
+++ Sjeng-Free-11.2/book.c	2011-07-23 23:40:26.000000000 +0200
@@ -38,6 +38,10 @@
 #define book_solid 4         /* =   */
 #define book_murky 5         /* ?!  */
 
+#undef fopen
+#define fopen book_fopen
+FILE * book_fopen(const char * name, const char * mode);
+
 int init_book (void) {
 
    /* simply read all the book moves into a book array.  The book will be
diff -ru Sjeng-Free-11.2-orig/newbook.c Sjeng-Free-11.2/newbook.c
--- Sjeng-Free-11.2-orig/newbook.c	2011-07-23 23:26:30.000000000 +0200
+++ Sjeng-Free-11.2/newbook.c	2011-07-23 23:40:26.000000000 +0200
@@ -466,13 +466,13 @@
   srand(time(0));
   
   if (Variant == Normal)
-    binbook = gdbm_open("nbook.bin", 16384, GDBM_READER, 0, NULL);
+    binbook = gdbm_open(SJENG_LIB_PATH "/nbook.bin", 16384, GDBM_READER, 0, NULL);
   else if (Variant == Suicide)
-    binbook = gdbm_open("sbook.bin", 16384, GDBM_READER, 0, NULL);
+    binbook = gdbm_open(SJENG_LIB_PATH "/sbook.bin", 16384, GDBM_READER, 0, NULL);
   else if (Variant == Losers)
-    binbook = gdbm_open("lbook.bin", 16384, GDBM_READER, 0, NULL);
+    binbook = gdbm_open(SJENG_LIB_PATH "/lbook.bin", 16384, GDBM_READER, 0, NULL);
   else 
-    binbook = gdbm_open("zbook.bin", 16384, GDBM_READER, 0, NULL);
+    binbook = gdbm_open(SJENG_LIB_PATH "/zbook.bin", 16384, GDBM_READER, 0, NULL);
     
   
   if (binbook == NULL)
Only in Sjeng-Free-11.2: newbook.c.orig
diff -ru Sjeng-Free-11.2-orig/rcfile.c Sjeng-Free-11.2/rcfile.c
--- Sjeng-Free-11.2-orig/rcfile.c	2011-07-23 23:26:30.000000000 +0200
+++ Sjeng-Free-11.2/rcfile.c	2011-07-23 23:40:26.000000000 +0200
@@ -47,6 +47,10 @@
 int cfg_attackeval;
 float cfg_scalefac;
 
+#undef fopen
+#define fopen book_fopen
+FILE * book_fopen(const char * name, const char * mode);
+
 void read_rcfile (void) 
 {
   int i;
diff -ru Sjeng-Free-11.2-orig/sjeng.c Sjeng-Free-11.2/sjeng.c
--- Sjeng-Free-11.2-orig/sjeng.c	2011-07-23 23:26:30.000000000 +0200
+++ Sjeng-Free-11.2/sjeng.c	2011-07-23 23:40:26.000000000 +0200
@@ -975,3 +975,26 @@
   return 0;
 
 }
+
+#define MAXBOOKPATH 1000
+
+FILE * book_fopen(const char * name, const char * mode)
+{
+   /* We search a couple of different directories */
+   char			path[MAXBOOKPATH];
+   FILE * 		f;
+   const char *	home;
+
+   if (f = fopen(name, mode)) /* Current directory */
+	   return f;
+   if (home = getenv("HOME")) 
+	   if (snprintf(path, MAXBOOKPATH, "%s/lib/sjeng/%s", home, name) 
+		   < MAXBOOKPATH
+		   )
+		   if (f = fopen(path, mode)) /* ~/lib/sjeng */
+			   return f;
+   if (snprintf(path, MAXBOOKPATH, "%s/%s", SJENG_LIB_PATH, name) < MAXBOOKPATH)
+	   if (f = fopen(path, mode)) /* $(SJENG_LIB_PATH)/sjeng */
+		   return f;
+   return NULL;
+}
Only in Sjeng-Free-11.2: sjeng.c.orig
diff -ru Sjeng-Free-11.2-orig/sjeng.h Sjeng-Free-11.2/sjeng.h
--- Sjeng-Free-11.2-orig/sjeng.h	2011-07-23 23:26:30.000000000 +0200
+++ Sjeng-Free-11.2/sjeng.h	2011-07-23 23:40:26.000000000 +0200
@@ -39,6 +39,8 @@
 #define NDEBUG 
 #include <assert.h>
 
+#define SJENG_LIB_PATH  	"/usr/local/lib/sjeng"
+
 #define DIE (*(int *)(NULL) = 0)
 
 /* GCP : my code uses WHITE=0 and BLACK=1 so reverse this */