diff --git a/pgbuild.sh b/pgbuild.sh
index 9d4c0baa65..8ba1e2cbf9 100755
--- a/pgbuild.sh
+++ b/pgbuild.sh
@@ -31,3 +31,9 @@ export DESTDIR=$REPO_ROOT/tmp_install
 
 echo "Installing postgres to $DESTDIR"
 make install -s
+
+#Configure postgres in src directory. We need it for postgres_ffi build
+echo "Configuring postgres build in place"
+cd ../../vendor/postgres/
+./configure CFLAGS='-O0' --enable-debug --enable-cassert \
+    --enable-depend --with-libxml --prefix=/ > configure.log
\ No newline at end of file