diff -ur jamvm-1.5.0.old/configure.ac jamvm-1.5.0/configure.ac
--- jamvm-1.5.0.old/configure.ac	2008-03-03 17:31:46.000000000 +0200
+++ jamvm-1.5.0/configure.ac	2008-03-03 17:36:14.000000000 +0200
@@ -208,6 +208,7 @@
     install_dir=$prefix
 fi
 AC_DEFINE_UNQUOTED(INSTALL_DIR, "$install_dir", [Installation directory (prefix)])
+AC_DEFINE_UNQUOTED(PKGDATADIR, "$datadir/$PACKAGE", [Package data directory (pkgdatadir)])
 
 AC_ARG_ENABLE(zip,
     [AS_HELP_STRING(--disable-zip,turn-off zip support in the bootstrap loader)],,)
diff -ur jamvm-1.5.0.old/src/class.h jamvm-1.5.0/src/class.h
--- jamvm-1.5.0.old/src/class.h	2008-03-03 17:31:46.000000000 +0200
+++ jamvm-1.5.0/src/class.h	2008-03-03 17:36:51.000000000 +0200
@@ -39,10 +39,10 @@
    separate class files in a directory structure */
 
 #ifdef USE_ZIP
-#define JAMVM_CLASSES INSTALL_DIR"/share/jamvm/classes.zip"
+#define JAMVM_CLASSES PKGDATADIR"/classes.zip"
 #define CLASSPATH_CLASSES CLASSPATH_INSTALL_DIR"/share/classpath/glibj.zip"
 #else
-#define JAMVM_CLASSES INSTALL_DIR"/share/jamvm/classes"
+#define JAMVM_CLASSES PKGDATADIR"/classes"
 #define CLASSPATH_CLASSES CLASSPATH_INSTALL_DIR"/share/classpath"
 #endif