thodg/cgminer

diff --git a/configure.ac b/configure.ac
index dab51dc..795f50d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -162,7 +162,13 @@ AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return __builtin_types_compatib
 AC_COMPILE_IFELSE([AC_LANG_SOURCE([static int __attribute__((warn_unused_result)) func(int x) { return x; }])],
 			  AC_DEFINE([HAVE_WARN_UNUSED_RESULT], [1],
                                     [Define if __attribute__((warn_unused_result))]))
-  
+
+if test "x$prefix" = xNONE; then
+	prefix=/usr
+fi
+
+AC_DEFINE_UNQUOTED([CGMINER_PREFIX], ["$prefix/bin/"], [Path to cgminer install])
+
 AC_SUBST(OPENCL_LIBS)
 AC_SUBST(JANSSON_LIBS)
 AC_SUBST(PTHREAD_FLAGS)
diff --git a/ocl.c b/ocl.c
index 9c86161..5977e06 100644
--- a/ocl.c
+++ b/ocl.c
@@ -32,11 +32,19 @@ extern int opt_worksize;
 
 char *file_contents(const char *filename, int *length)
 {
-	FILE *f = fopen(filename, "rb");
+	char *fullpath = alloca(strlen(CGMINER_PREFIX) + strlen(filename));
 	void *buffer;
+	FILE *f;
+
+	strcpy(fullpath, CGMINER_PREFIX);
+	strcat(fullpath, filename);
+
+	f = fopen(filename, "rb");
+	if (!f)
+		f = fopen(fullpath, "rb");
 
 	if (!f) {
-		applog(LOG_ERR, "Unable to open %s for reading", filename);
+		applog(LOG_ERR, "Unable to open %s or %s for reading", filename, fullpath);
 		return NULL;
 	}