diff --git a/gnu/packages/openldap.scm b/gnu/packages/openldap.scm
index 7035f65c1f..e25e3b4b10 100644
--- a/gnu/packages/openldap.scm
+++ b/gnu/packages/openldap.scm
@@ -254,7 +254,9 @@ servers from Python programs.")
                            ,@%default-gnu-imported-modules)
       #:disallowed-references (list httpd)
       #:configure-flags
-      #~(list "--enable-cmocka"
+      #~(list (string-append "CFLAGS=-g -O2"
+                             " -Wno-error=incompatible-pointer-types")
+              "--enable-cmocka"
               (string-append "--with-db="
                              #$(this-package-input "bdb"))
               (string-append "--with-netsnmp="