diff --git a/config.h.in b/config.h.in
index c444a0bbb..5f6908192 100644
--- a/config.h.in
+++ b/config.h.in
@@ -39,6 +39,10 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
 /* Define to 1 if your C compiler doesn't accept -c and -o together. */
 #undef NO_MINUS_C_MINUS_O
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 3a01aaf97..94dcb576f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -351,6 +351,7 @@ libbulletdynamics_la_SOURCES = \
 		BulletDynamics/Vehicle/btWheelInfo.h
 
 libbulletsoftbody_la_SOURCES = \
+		BulletSoftBody/btDefaultSoftBodySolver.cpp \
 		BulletSoftBody/btSoftBodyRigidBodyCollisionConfiguration.cpp \
 		BulletSoftBody/btSoftBody.cpp \
 		BulletSoftBody/btSoftRigidCollisionAlgorithm.cpp \