diff --git a/lib/cpp/configure.ac b/lib/cpp/configure.ac
index d0fc7c1..1f2763c 100644
--- a/lib/cpp/configure.ac
+++ b/lib/cpp/configure.ac
@@ -100,8 +100,8 @@
 
 AC_PROG_LIBTOOL
 
-CFLAGS="-O2"
+CFLAGS="-g -O2"
 
-CXXFLAGS="-O2"
+CXXFLAGS="-g -O2"
 
 AC_OUTPUT(Makefile)