diff --git a/build/libgeoip.m4 b/build/libgeoip.m4
index f0a8865c..2b612420 100644
--- a/build/libgeoip.m4
+++ b/build/libgeoip.m4
@@ -19,12 +19,12 @@ GEOIP_CPPFLAGS=""
 GEOIP_LDADD=""
 GEOIP_LDFLAGS=""
 GEOIP_CONFIG=${PKG_CONFIG}
-GEOIP_PKGNAMES="geoip2 geoip GeoIP libGeoIP"
+GEOIP_PKGNAMES="geoip2 geoip GeoIP"
 GEOIP_SONAMES="so la sl dll dylib"
 
 AC_ARG_WITH(
     geoip,
-    [AC_HELP_STRING([--with-geoip=PATH],[Path to geoip prefix])]
+    [AC_HELP_STRING([--with-geoip=PATH],[Path to geoip prefix or config script])]
     ,, with_geoip=yes)
 
 AS_CASE(["${with_geoip}"],
diff --git a/src/parser/driver.cc b/src/parser/driver.cc
index b555c599..b4db0800 100644
--- a/src/parser/driver.cc
+++ b/src/parser/driver.cc
@@ -167,7 +167,9 @@ void Driver::error(const yy::location& l, const std::string& m,
     const std::string& c) {
     if (parserError.tellp() == 0) {
         parserError << "Rules error. ";
-        parserError << "File: " << ref.back() << ". ";
+        if (ref.empty() == false) {
+            parserError << "File: " << ref.back() << ". ";
+        }
         parserError << "Line: " << l.end.line << ". ";
         parserError << "Column: " << l.end.column << ". ";
     }
diff --git a/test/optimization/optimization.cc b/test/optimization/optimization.cc
deleted file mode 100644
index cd43e072..00000000
--- a/test/optimization/optimization.cc
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <stdio.h>
-
-
-int main(int argc, char **argv) {
-
-    return 0;
-}
-